Prof. Chandana Jayaratne

PROFESSOR
HEAD OF THE DEPARTMENT

Department of Physics
University of Colombo
Colombo 00300
Sri Lanka

Office: Department of Physics – Room No. PH302
Work Phone: +94 11-215 8357
Work Fax: +94 11-258 4777
Email: chandana@phys.cmb.ac.lk

Academic & Professional Qualifications

  • PhD 1992

    Ph.D. Atmospheric Physics

    Uppsala University

  • BSc

    B.Sc ( Physics Special )

    sample location

    Research Interests

    • Atmospheric Physics (mainly the fair weather and thunderstrom electricity research)
    • Lightning Physics
    • Astronomy

    ALL PUBLICATIONS

    Journal Publications

     

    1. AlphaTg: GUI application for flux and limb derivatives of UBVRI, Kepler and TESS pass-bands for asteroseismology, J.Adassuriya, K.Sellahewa, K.P.S.C.Jayaratne, and S.Ganesh, Elsevier, Astronomy and Computing 42, pp1-8, (2022) https://doi.org/10.1016/j.ascom.2022.100670

     

    1. Short-time variation in atmospheric pressure, humidity, and temperature during the annular solar eclipse of December 2019 in Sri Lanka. Madushan, H., Jayaratne, C., and Wijemannage, A., Science, Engineering and Health Studies, 16, 22020003 (2022).

     

    1. Analytical Study of Urban Heat Spot Patterns in Colombo District from 1988 – 2019 based on Landsat Data, Saumya Chathuranga, and Chandana Jayaratne, Int. J. Dis. Manag. 5:1, pp 15-34, (2022).

    https://doi.org/10.24815/ijdm.v5i1.24081.

     

    1. Identifying Variable Stars from Kepler Data Using Machine Learning, J Adassuriya, JANSS Jayasinghe, KPSC Jayaratne, European J. of Applied Physics, 332-37, (2021).
    2. Seasonal variation of inter-hemispheric field-aligned currents deduced from time-series analysis of the equatorial geomagnetic field data during solar cycle 23–24, Manjula Ranasinghe, Akiko Fujimoto, Akimasa Yoshikawa & Chandana Jayaratne, Earth, Planets and Space, 73, 146 (2021). https://doi.org/10.1186/s40623-021-01481-6
    3. Asteroseismology of SZ Lyn using multiband high time resolution photometry from ground and space, J Adassuriya, S Ganesh, J L Gutiérrez, G Handler, Santosh Joshi, K P S C Jayaratne, and K S Baliyan, Monthly Notices of the Royal Astronomical Society, Volume 502, , Issue 1, 541–555, March 2021. https://doi.org/10.1093/mnras/staa3923.
    4. Determination of oscillation frequencies and stellar properties of three Delta Scuti variable stars using Kepler data, J. Adassuriya, K.P.S.C. Jayaratne, T.L.V. Cooray and M. L. C. Attygalle , Journal of the National Science Foundation of Sri Lanka, 48(4),367-378, 2020.
    5. Characterizing the possible interior structures of the nearby Exoplanets Proxima Centauri b and Ross-128 b”, Mahesh Herath, Saraj Gunesekera, and Chandana Jayaratne, Monthly Notices of the Royal Astronomical Society(MNRAS), Volume 500, , Issue 1, 333-354, 15th Oct., 2020.
    6. A Robotic Camera for Monitoring Meteors Entering the Earth’s Atmosphere near the Equator H.D.S. Amaradasa1, G.D.K. Mahanama, S.S. Abeywickrama, A.G.P.D. Alahakoon, K.P.S.C. Jayarathne, N.C. Wickramasinghe, Advances in Astrophysics, Vol. 4, No. 3, 86-95, August 2019
    7. Two temperate sub-Neptunes transiting the star EPIC 21273744, Mahesh Herath,Tobias C. Hinse, John H. Livingston ,  Jes´us Hern´andez, Daniel F. Evans, Robert Wells , Saraj Gunesekera,1Jeremy Tregloan-Reed, Markus Rabus , Jesper Skottfelt, Martin Dominik , Uffe G. Jørgensen, Chandana Jayaratne and Cuc T. K. L´y, Monthly Notices of the Royal Astronomical Society(MNRAS), Volume 488, Issue 1, 536-546, 14th  June 2019.
    8. Light travel time effect of the binary orbit of SZ Lyn, J. Adassuriya, K.P.S. C. Jayaratne, and S. Ganesh, J. Sri Lanka Assoc. Advmt. Sci., 1, 54-65, 2018.
    9. Analysis of type II and type III solar radio bursts, J.V. Wijesekera, K. P. S. C. Jayaratne and J. Adassuriya, J. Phys.: Conf. Ser.,1005, 012046, 2018.
    10. Transient Impedance Characteristics of Soil and Sand, M Udara Mendis, KPS Chandana Jayaratne, S. Nanayakkara, Mahbubur Rahman, Int. Innovation in Science and Mathematics, Vol. 4, Issue 4, pp. 150-154,  July 2016.
    11. A Method to Estimate the Cooling Time of Ultra-Relativistic Electrons in Pulsar Wind Nebulae, L. I. Gunawardhana, K. P. S. C. Jayaratne, J. Adassuriya. American Journal of Astronomy and Astrophysics. Vol. 3, No. 3, 63-69, 2015.
    12. Study of Property Damages Due to Lightning in Sri Lanka, A.W.M.B. Wijekoon, M.A.R.M. Fernando and K.P.S.C. Jayaratne, Transactions of Institution of Engineers(SL), Vol.1, Part B, pp 464-471,2011.
    13. Locating cloud to ground lightning flashes with simultaneous two station measurements, DUJ Sonnadara, AB Weerasekera, IMK Fernando, R Lelwela, KPSC Jayaratne, TR Ariyaratne, S. Namasivayam & KRA Bandara, Sri Lanka Journal of Physics Vol 1(2000) 11-22.
    14. Study of the Performance of Direction Finding Stations Prior to the Implementation of a Lightning Locating System in Sri Lanka, IMK Fernando, DUJ Sonnadara, KPSC Jayaratne, TR Ariyaratne, S. Namasivayam & KRA Bandara, Ceylon Journal of Science 5, pp 65-73 (1998)
    15. Comparison of preliminary breakdown pulses observed in Sweden and in Sri Lanka, Chandima. Gomes, Vernon Cooray and Chandana Jayaratne, J. Atmos. Solar-Terr. Phys., 60(10), 975-979, 1998.
    16. Measurement of space charge density over flat ground in the nearly neutral stratified atmospheric surface layer, R. Lelwala, S. Israelsson and K. P. S. C. Jayaratne, J. Atmos. Electricity., 17(02),59-68, 1997
    17. Some characteristic features of radiation field signatures from tropical cloud flashes, K. P. S. C. Jayaratne and W. J. M. Samaranayake, J. Inst. Phys., Sri Lanka; 11(B), 1, 1995.
    18. Power frequency characteristics and over-voltage disturbances (impulses) in 230 VAC electric power distribution systems in Colombo, Sri Lanka, K. P. S. C. Jayaratne and A.G. Dayananda, J. Inst. Phys., Sri Lanka; 11(B), 3, 1995.
    19. Characteristics of lightning flashes observed in Sri Lanka in the tropics, V. Cooray and K. P. S. C. Jayaratne, Geophys. Res., 99, 21051-21056, 1994.
    20. The lightning HF radiation at 3 MHz during leader and return stroke processes, K. P. S. C. Jayaratne and V. Cooray, J. Atmos. Terr. Phys., 56(4), 493-501, 1994.
    21. A radiation technique for the measurement of wave activity on seashore, K. P. S. C. Jayaratne, P. R. D. Rajapakshe and K. G. Dharmawardane, J. Inst. , Sri Lanka;  2,  18-22, Colombo,1986.
    22. Preliminary studies of the earth’s fair-weather electric field in Sri Lanka, K. P. S. C. Jayaratne and A. S. Dissanayake, J. Inst. Phys., Sri Lanka, 2, 23-28, Colombo,
    23. An investigation of sources of errors by space charge measurements using the Obolensky filter method, E. Knudsen, K. P. S. C. Jayaratne and S. Israelsson, J. Atmos. Terr. Phys., 51(6), 529-531, 1989.

     

    FULL  PAPERS/Abstracts of prEsentations at international scientific meetings

     

    1. Long wave antenna design for CALLISTO system, S. Liyanaarachchi, J. Adassuriya, and K P S C Jayaratne, 2021 From Innovation To Impact (FITI), 2021, pp. 1-5,IEEE publication, doi: 10.1109/FITI54902.2021.9833069.

     

    1. Study of temporal variation of radiofrequency electromagnetic radiation levels in two bedrooms in urban and rural locations in Sri Lanka – a case study, S.A.T.U.W.K. Suraweera and K.P.S.C. Jayaratne, Int. Conf. Multidisciplinary Approaches in Science 2021 , Faculty of Science, University of Colombo, ICMAS-C033, p 104, Dec 24-26, 2021. URL: https://science.cmb.ac.lk/icmas2021/ icmas/conference-tracks/advances-in-basic-sciences-towards-technological-development/

     

    1. Modelling Exoplanet interiors: The structures of Proxima b, Bernard Star b and Ross-128 b, M.V.Y. Herath., S. Gunesekera., K.P.S.C. Jayaratne., 43rd COSPAR scientific assembly 2021, Sydney, Australia (Oral). https://www.cospar-assembly.org/admin/session_cospar.php?session=850

     

    1. Development of a Low-Cost Transducer with Data Acquisition Software for the Continuous Measurement of Greenhouse Gas Percentages in Sri Lanka, H.G.K. Abeywickrama and K.P.S.C. Jayaratne, Proc. of the 25th Int. Forestry and Environment Symposium 25, 50, Jan 2021.

     

    1. Mendis, M.U., Chandana Jayaratne, K.P.S. “Lightning transient on neighbourhoods of communication towers: a simulation case study” Asia-Pacific International Conference on Lightning, Hong Kong, 2019, P. ID147.
    2. Observations of transiting exoplanets around host stars with near-by companions, M.V.Y Herath., T. C Hinse., K.P.S.C Jayaratne., S. Gunesekera., 2019, “, European Planetary Science Congress 2019, Geneva, Switzerland. URL:https://meetingorganizer.copernicus.org/EPSC-DPS2019/EPSC-DPS2019-1847-1.pdf

     

    1. Gihan Weerasekara, Thulsi Wickramasinghe and Chandana Jayaratne, The significance of the peculiar motions of the objects in the gravitational lensing time delay calculations, 30th Texas Symposium on Relativistic Astrophysics, December 2019, Portsmouth, United Kingdom.
    2. Herath M. V. Y, Hinse T. C., Jayaratne K.P.S.C., Gunesekera S., “Possible discovery of two Mini-Neptune type planets around a dim K-star”, European Planetary Science Congress, 2018, Berlin, Germany.( https://meetingorganizer.copernicus.org/EPSC2018/EPSC2018-244.pdf)

     

    1. Astrossiomolgy of SZ Lyn using very high-resolution photometry in BVR bands, Janaka Adassuriya, Chandana Jayaratne, & Shashikiran Ganesh. Asteroseismology of SZ Lyn using very high time resolution photometry in BVR bands. Zenodo. Physics of Oscillating Stars (PHOST), Banyuls-sur-mer, France, 2-7 September 2018, published in http://doi.org/10.5281/zenodo.1463699 Oct. 2018.
    2. Installation of a MAGDAS-9 magnetometer in Sri Lanka to measure magnetic field variations near the dip equator, K P S C Jayaratne, A D M P Ranasinghe and A. Yoshikawa, 6th Conference on Sri Lanka-Japan Collaborative Research-2018, 1st of September 2018, Peradeniya, Sri Lanka.
    3. A spectral analysis of the BL-Lac type AGN 1ES 1959+650 in the X-ray and Gamma ray energy bands, M.V.Y. Herath, A U Abeysekra, and  P.S.C Jayaratne., National Astronomy Meeting 2017, Hull, United Kingdom. URL: https://nam2017.org/schedule-by-session/form/27/369-a-spectral-analysis-of-the-bl-lac-type-agn-1es-1959-650-in-the-x-r ay-and-gamma-ray-energy-band

     

    1. On the Calculation of the Time Delay Between Gravitationally Lensed Images When Peculiar Motions are into Account, Gihan Weerasekra, Thulsi Wickramasinghe and Chandana Jayaratne, 4th Conf. of the Polish Society on Relativity, September 2017.
    2. Calculation of a more realistic value for the time delay between gravitationally lensed images when the peculiar motion of the lenses and of the source is considered, Gihan Weerasekra, Thulsi Wickramasinghe and Chandana Jayaratne, Abstract 161, 29th Int. Texas Sym. on Relativistic Astrophysics. CTICC, Cape Town, South Africa, Dec. 2017.
    3. Effects of lightning and possible health hazards due to the erection of telecommunication towers, J A K Maduranga, S R D Kalingamudali and K P S C Jayaratne, Proc. Wayamba University Int.Conf., p 248, Aug.19-20, 2016.
    4. Short and long term flux variability of the BL Lacertae object 1ES 2200+420, in the MeV – GeV range Abstract:, Mahesh Herath,  Anushka Abeysekara , Chandana Jayaratne, Proc. American Physics Society Meeting, Vol. 61, No. 6 BAPS.2016.APR.T1.58, April 16–19, 2016.
    5. A Preliminary Study on Lightning Protection of houses in the proximity of a 70 m tall Communication Tower in Sri Lanka M Udara Mendis and K P S Chandana Jayaratne, Proc. Asia-Pacific Int. Conf. on Lightning (APL), Nagoya, Japan, pp 1015 -1019, Oct 2015.
    6. Effect of solar activity on the occurrence of weather extreme events, P. S. Chandana Jayaratne and Joe C. Fernando, 26th IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition and Processing, , Hyderabad, India, Oct 7-16, 2014.
    7. Long term variation of lightning casualties in Sri Lanka: from 1958-2009, K. P. S. C. Jayaratne and L. S. L. Dias, 6th International Programme Committee meeting and Scientific Seminar on SAARC STORM Field Experiments, Hotel Renuka, Colombo, 20-21 Dec. 2013.
    8. Development of a new image processing technique to identify real time  meteoroid hits on lunar surface using space-based or earth-based telescopic images, K P S Chandana Jayaratne & A P C Sudeera Jayasekara, 1st COSPAR Symposium on  “Planetary Systems of our Sun and other Stars, and the Future of Space Astronomy.”, Bangkok, Thailand,1-3P, Nov.11-15, 2013.
    9. Effect of solar activity on weather changes and occurrence of extreme event cyclones, Joe C. Fernando1 and K.P.S. Chandana Jayaratne, 1st COSPAR Symposium on “Planetary Systems of our Sun and other Stars, and the Future of Space Astronomy.”, Bangkok, Thailand, p18, Nov.11-15, 2013.
    10. Public Perceptions and Lightning Safety Education in Sri Lanka, K. P. S. Chandana Jayaratne and Chandima Gomes, Proc. Int. Conf. Lightning Protection(ICLP),Vienna, Austria, September 2012.
    11. Survey on Property Damages Due to Lightning in Sri Lanka, A.W.M.B. Wijekoon, M.A.R.M. Fernando and K.P.S.C. Jayaratne, International Conference on Communication Computation, Management and nanotechnology (ICN – 2011, REC Bhalki, India, p 42, September 2011.
    12. Buddhism and Science, Dr. Chandana Jayaratne, 1st International Buddhist Conference on “The Buddhist Way for a Better World”, Temple of Tooth Relic, Kandy Sri Lanka, 11-12 Aug. 2006.
    13. Cloud Charging Mechanisms, K P S C Jayaratne, UNESCO Regional Workshop on Lightning Physics, 23.04 -07.05.2003, Colombo, Sri Lanka,.2003.
    14. Effect of wind on horizontal wire antenna collecting atmospheric air-earth current, R. Lelwala, T. J. Tuomi, S. Israelsson and K. P. S. C. Jayaratne, Proc. 11th Conf. Atmos. Electricity, 610-613, Alabama, USA,  June 1999.
    15. Astronomy in Sri Lanka, K. P. S. Chandana Jayaratne & G. H. P. Dharmaratne, Seminars of the United Nations Programmes on Space Applications – Selected Papers on Space Science Education, Remote Sensing and Small Satellites, 8, 95-98, United Nations, 1997.
    16. Comparison of preliminary breakdown pulses observed in Sweden in the temperate regions and that in Sri Lanka in the tropics,  A. C. Gomes, Vernon Cooray  and K. P. S. C.  Jayaratne, Proc. 10th Int. Symposium on  High Voltage  Eng. Montreal, Canada, 237-240, Aug. 1997.
    17. Scientific and technological culture in Sri Lanka-country report, K.P.S.C. Jayaratne, Expert Group Meeting on Training to Popularise Scientific and Technological Culture organised by the Commonwealth Secretariat, AMIC, Singapore, 28-31 May, 1997.
    18. Measurement of space charge density over flat ground in nearly neutral stratified atmospheric surface layer, R. Lelwala, S. Israelsson and K. P. S. C. Jayaratne, 10th Int. Conf. Atmos. Electricity, Osaka, Japan, pp. 168-171, June 1996.
    19. Observation of huge globular shape regions of subatomic particles churned up by Jupiter  Shoemaker-Levy 9  impact using 28 cm reflector telescope and a video camera, K. P. S. C. Jayaratne, Proc. 5th United Nations/European Space Agency Workshop on Basic Space Science – From Small Telescopes to Space Missions, Session 10,  Jan 11-13, 1996.
    20. Use of electronic and print media in Sri Lanka to educate the public & school children on astronomy from grass root level, K. P. S. C. Jayaratne, Proc. 5thUnited Nations/European Space Agency Workshop on Basic Space Science – From Small Telescopes to Space Missions, Session 03,  Jan 11-13, 1996.
    21. Sri Lanka country report on management of Ozone Depletion Substances (ODS) phase-out in Small and Medium Scale Enterprises (SMEs), K. P. S. C. Jayaratne, Proc. Asian Regional Workshop on Ozone Depletion & ODS Phase-Out in SMEs, New Delhi, India, 7 – 10 February, 1995.
    22. Effect of nearby grounded objects on the measurement of atmospheric small ions, K. P. S. C. Jayaratne, E. Knudsen and S. Israelsson, Proc. 9th Conf. Atmos. Electricity, Leningrad, USSR, pp. 611-614, June 1992.
    23. Electrical aspects of severe local storms in the tropics, K. P. S. C. Jayaratne, Proc. SAARC Regional Seminar on Severe Local Storms, Colombo, Sri Lanka, 7 – 11 October, 1991.
    24. The effect of distorted atmospheric electric field lines on the measurement of small ion number densities and related electrical parameters, P. S. C. Jayaratne, E. Knudsen and S. Israelsson, 8th  Int. Conf. Electrostatics, Oxford, U.K., 1991.
    25. Effect of propagation across a coast line on the electromagnetic fields from lightning return strokes, P. S. C. Jayaratne and Vernon Cooray, Proc. 20th Int. Conf. Lightning Protection, Interlaken, Switzerland, pp. 6.1/1-6, 1990.

     

    Abstracts / FULL PAPERS of presentation at scientific meetings in Sri Lanka

     

    1. High Energy Gamma-ray fluxes in MeV and GeV regions of six BL-lac Objects during the period of 2008 – 2012, L.P.M.I. Randu, and K.P.S.C. Jayaratne, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, 311, Nov. 17, 2022.
    2. Radiofrequency pollution levels in Colombo city area due to cellular networks and Wi-Fi sources, S.A.T.U.W.K. Suraweera and K.P.S.C Jayaratne, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, 310, Nov. 17, 2022.
    3. The Dynamicity of Vegetation Distribution against the Land Surface Temperature in the Colombo Metropolitan Area from 1988-2019, Saumya Chathuranga1 and K. P. S. C. Jayaratne, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, 308, Nov. 17, 2022.
    4. Study the connection between orbital and superorbital flux of the LS I +61° 303 object, L. Isuru Gunawardhana, K.P.S.C. Jayaratne,  and A.U. Abeysekara, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, 307, Nov. 17, 2022.
    5. A case study on the increase of RF levels in the proximity of a mobile phone when making and receiving a call, S. A. T. U. W. K. Suraweera and P.S.C.Jayaratne, 77th   Proc. Sri Lanka Assoc. Advmt. Sci.,E1, P.58,  Dec. 20211.
    6. EM pollution in the proximity of a transmission tower located in a highly residential area: A case study, S. A. T. U. W. K. Suraweera and P.S.C.Jayaratne, 76th   Proc. Sri Lanka Assoc. Advmt. Sci., E1-513,  Dec. 2020.
    7. Constraint of a light curve simulation to measure weighted cross-correlation of MeV and GeV Fluxes, L. P. M. I. Randu and P.S.C.Jayaratne, 76th   Proc. Sri Lanka Assoc. Advmt. Sci., E1-512,  Dec. 2020.
    8. A numerical model that could determine the evolution of shape and rotation of cometary nuclei due to sublimation of cometary ice, A. P. S. Kumari, N. H. Samarasinha, and P.S.C.Jayaratne, N.C.Wickramasinghe, 76th   Proc. Sri Lanka Assoc. Advmt. Sci., E1-511,  Dec. 2020.
    9. Oscillation frequencies of two Delta Scuti stars; KIC 4077032 and KIC 8623953, J. Adassuriya and P.S.C.Jayaratne, 76th   Proc. Sri Lanka Assoc. Advmt. Sci., E1-510,  Dec. 2020.
    10. Characterization of Aluminium reflective thin films deposited by a modified thermal evaporator designed for coating telescope optics, H D S Amaradasa, A G P D. Alahakoon, K G Samararathna, S S Abeywickrama, G D K Mahanama, K P S C Jayaratne, N C Wickramasinghe, 36th   of the Institute of Physics, Sri Lanka, pp 3-8, August 2020.
    11. A case study on the impact of geomagnetic storm of 7 – 8 September 2017 on geomagnetic field around Sri Lanka, A. D. Manjula P. Ranasinghe, K. P. S. Chandana Jayaratne and Akimasa Yoshikawa, Proc. Annul Res. Symposium, University of Colombo, Sri Lanka, 233, Nov. 22, 2019.
    12. On the significance of the motions in the gravitational lensing time delays   Gihan Weerasekara,  K P S Chandana Jayaratne, and Thulsi Wickramasinghe, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, 239, Nov. 22, 2019.
    13. Thermal Modeling of Cometary Nuclei to Monitor Volatile Sublimation Driven Evolution of the Nuclear Shape and Rotation. Saumya Kumari Pathirana, K. P. S. Chandana Jayaratne and Nalin H. Samarasinha, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, 222, Nov. 22, 2019.
    14. Orbital elements of SZ Lyn, J Adassuriya, K.P.S.C. Jayaratne, S. Ganesh, 74th   Sri Lanka Assoc. Advmt. Sci., E1-509,  Dec. 2018
    15. Preliminary studies of data and measurements from MAGDAS-9 magnetometer in Sri Lanka, A D M P Ranasinghe, K.P.S.C. Jayaratne, A Yoshikawa, 74th   Sri Lanka Assoc. Advmt. Sci., E1-513,  Dec. 2018.
    16. Development of an autonomous wide-field camera unit for monitoring optical transients that occur in the atmosphere, D.S.Amaradasa, G.D.K.Mahanama, S.S.Abeywickrama, A.G.P.D.Alahakoon K.P.S.C.Jayarathna, N.C.Wickramasinghe, 74th   Proc. Sri Lanka Assoc. Advmt. Sci., E1-517,  Dec. 2018.
    17. Space Science and Technology Applications for Sustainable Development, K P S Chandana Jayaratne, 74th Sri Lanka Assoc. Advmt. Sci., Part-ii,pp 1-7, Dec. 2018. 
    18. The effect of peculiar motion of galaxies when calculating the gravitational lensing time delay, G. Weerasekara, T. Wickramasinghe, and K. P. S. C. Jayaratne, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, 2018.
    19. Daily-binned GeV Gamma-Ray flux variability of BL Lacertae object from 2011 – 2017, K. L. I. Gunawardhana, K. P. S. C. Jayaratne, A.U. Abeysekara, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, 2018.
    20. Establishment of a MAGDAS-9 magnetometer in Sri Lanka and study of magnitude of daily geomagnetic variation around Sri Lanka, A. D. M. P. Ranasinghe, K. P. S. C. Jayaratne, A. Yoshikawa, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, 2018.
    21. Determination of oscillation frequencies of Delta Scuti star KIC 1162150, J. Adassuriya, K. P. S. C. Jayaratne, P. T. L. V. Cooray, M. L. C. Attygalle, Proc. Annual Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, 2018.
    22. On the study of umbra-penumbra size ratio of sunspots using image processing techniques, S.B.Bamunuarachchige and K.P.S.Chandana Jayaratne, 34th of the Institute of Physics, Sri Lanka, pp 37-44, March 2018.
    23. A study on the genesis and nature of granules on the solar photosphere using an image processing technique, J. Yasitha Kahapalaarachchi and K. P. S. Chandana Jayaratne, 34th of the Institute of Physics, Sri Lanka, pp 45-50, March 2018.
    24. Fermi-Lat GeV Flux Observation of the BL Lacertae Object, K.L.I. Gunawardhana, K.P.S.C. Jayaratne, A.U. Abeysekara, 73rd   Sri Lanka Assoc. Advmt. Sci., E1-511,  Dec. 2017.
    25. The effect of galaxy peculiar motion on the calculation of time delay between gravitationally lensed images, Gihan Weerasekara, T. Wickramasinghe and K. P. S. C. Jayaratne, Annual Res. Symposium, University of Colombo, Nov. 17, 2017.
    26. Swift XRT X-ray flux variability of the BL Lacertae object from 2005 to 2017, K. L. I. Gunawardhana, K. P. S. C. Jayaratne, A.U. Abeysekara, Annual Res. Symposium, University of Colombo, Nov.17, 2017.
    27. Light curve analysis of CC Andromeda, J. Adassuriya, K. P. S. C. Jayaratne, S. Ganesh, Annual Res. Symposium, University of Colombo, Nov. 17, 2017.
    28. An analysis of the γ-ray and X-ray lightcurves from the Blazar 1ES 1959+650, M. V. Y. Herath and K. P. S. C. Jayaratne, 33rd of the Institute of Physics, Sri Lanka, pp 24-30, March 2017.
    29. A study of the relationship between the sunspot number and some aspects of weather patterns in Sri Lanka using artificial neural networks, D. Achala Wickramasuriya and K P S Chandana Jayaratne, 72nd Sri Lanka Assoc. Advmt. Sci., E1-503,  Dec. 2016. 
    30. GeV Gamma-ray flux variability of the BL Lacertae object, K.L.I. Gunawardhana, K.P.S.C. Jayaratne, A.U. Abeysekara, M. Herath, Proc. Annual Res. Symposium, University of Colombo, p 266, Oct. 11-22, 2016.
    31. The highly variable activity of the Blazar 1ES 1959+650, and its implications towards understanding the physics of AGN’s, M.V.Y. Herath, Udara Abeysekara, K.P.S.C.Jayaratne, Proc. Annual Res. Symposium, University of Colombo, p 268, Oct. 11-22, 2016.
    32. Effect of meteoritic dust on the variation of global rainfall, Upali Jayasinghe and K P S C Jayaratne, 32nd of the Institute of Physics, Sri Lanka, pp 47-53, March 2016.
    33. An automated system to detect feature variations of planet Jupiter, M C Shashikala and K P S Chandana Jayaratne, 71st Sri Lanka Assoc. Advmt. Sci., E1-507,  Dec. 2015. 
    34. A case study on lightning protection of houses in the proximity of a 70 m tall
      communication tower M. U. Mendis and K. P. S. C. Jayaratne, Proc. Annual Res. Symposium, University of Colombo, p 135, Oct 29, 2015.
    35. Study of Electromagnetic Pollution in Sri Lanka, S A T U W K Suraweera and K P S C Jayaratne, 31st Institute of Physics, Sri Lanka, pp 43-51, March 2015.
    36. Accurate earth resistance measurement of communication towers, M U Mendis and K P S Chandana Jayaratne, 70th   Sri Lanka Assoc. Advmt. Sci., E1-829,  Dec. 2014. 
    37. Effects on tropospheric NOx level due to lightning, J A Priyanka and K P S Chandana Jayaratne*, 70th Sri Lanka Assoc. Advmt. Sci., E1-828,  Dec. 2014. 
    38. A method to estimate the cooling time of ultra-relativistic electrons in Pulsar Wind Nebulae, K L I Gunawardhana, A U Abeysekara, K P S C Jayaratne*, and J Adassuriya,   70th   Sri Lanka Assoc. Advmt. Sci., E1-827,  Dec. 2014. 
    39. A preliminary study on the distribution of earth resistance around communication towers in lightning prone areas, M Udara Mendis and K P S Chandana Jayaratne, Proc. Ann. Res. Symposium, University of Colombo,p241, Nov 20-21, 2014.
    40. Observation of solar radio bursts using E-Callisto system, J, Adassuriya, S. Gunasekera, K P S C Jayaratne and C. Monstein,   30th  Institute of Physics, Sri Lanka, pp 43-51, March 2014.
    41. Developing a statistical model to predict the rainfall at the onset of Maha season in the eastern part of the dry zone in Sri Lanka, A.M.A.H.D. Alagiyawanna, K.H.M.S. Premalal1 and K.P.S.C. Jayaratne, Symposium on Climate Change, Colombo, Sri Lanka 2013.
    42. Determination of spectral parameters of few selected bright stars using spectrum synthesis method, L A S Vitharana , R A S Saraj Gunasekara and  K P S Chandana Jayaratne,     69th   Sri Lanka Assoc. Advmt. Sci., E1-532,  Dec. 2013.
    43. Effect of meteoritic dust on the variation of global rainfall, Upali Jayasinghe, K.P.S. Chandana Jayaratne, Proc. Annual Res. Symposium, University of Colombo, p 160, Oct 3-4, 2013.
    44. Possibility of using satellite microwave imagery as an alternative technique to obtain rainfall data in Sri Lanka, K M Silva1 , I M S P Jayawardena2 and K P S C Jayaratne, Proc. Ann. Res. Symposium, University of Colombo, p 161, Oct 3-4, 2013.
    45. Public complaints on lightning-related hazards to the neighborhood of communication towers in Sri Lanka , M Udara Mendis and K P S Chandana Jayaratne, Proc. Ann. Res. Symposium, University of Colombo, p 162, Oct 3-4, 2013.
    46. Lightning risk management for sustainable development, Theme Seminar of Sri Lanka Assoc. Advent. (on Science for Sustainable Development and prosperity), 67th Annual Session, Colombo, Dec.10, 2012.
    47. Study of harmful UV radiation emissions from compact fluorescent lamps (CFL) retailing in Sri Lanka, P A I L Weerasena and K P S C Jayaratne, 67th Sri Lanka Assoc. Advmt. Sci., C-304,  Dec. 2012.
    48. Co-author of the UNDP funded booklet on “Akunu Anathuru Awama Karamu(Lets minimize the lightning casualties ” published by the Ministry of Disaster Preparedness.(2011.09.15).
    49. Development of Astronomy Research in Sri Lanka, K P S C Jayaratne, Presidential Address of the Institute of Physics Sri Lanka, 31st AGM.(26 March 2011.)
    50. Solar Radius Determination Using Baily Beads Observations of Annular Solar Eclipse on 15 January 2010 in Sri Lanka, S. Gunasekera, J. Adassuriya, I. Medagangoda L.H.J.D.K. Fernando and K. P. S. C. Jayaratne, 27th Proc. of the Institute of Physics, Sri Lanka, March 2011, pp 107-113.
    51. Buddhist pirith chants for mental and physical well being- A scientific approach, Proce. of the 7th Buddhist Conference on the United Nations Day of Vesak Celebrations, Mahachulalongkornrajavidyalaya University, Thailand,545-553, May 2010.
    52. Spectroscopic observations of novae V1065 CEN and V1280 SCO using 45 cm Cassegrain telescope at Arthur C Clarke Institute, S. Gunasekera, J. Adassuriya, I. Madagangoda, Werellapatha, K.P.S.C Jayaratne, 26th Proc. of the Institute of Physics, Sri Lanka, March 2010.
    53. Depth Dependence of the Solar Source Function using Visible Solar Spectra, A. Mahesha Jeewanthi, K.P.S.C. Jayaratne, S. Gunasekara and J. Adassuriya, 26th Proc. of the Institute of Physics, Sri Lanka, March 2010.
    54. On the study of post outburst of novae, K. Werellapatha, K P S C Jayaratne , S Gunasekera, J Adassuriya and I Medagangoda, International Intradisciplinary  Conference on the frontiers of astronomy, Mangalore University, India. 28-30 Dec 2009.
    55. Use of digital image processing techniques to analyze the solar disk and its proximity, N.V.C.D. Sarathchandra, K P S C Jayaratne , S Gunasekera, J Adassuriya and Imedagangoda, International Intradisciplinary  Conference on the frontiers of astronomy, Mangalore University, India. 28-30 Dec 2009.
    56. Effect of solar activity on weather changes and occurrence of extreme event cyclones, Joe C. Fernando and K.P.S. Chandana Jayaratne, SLAAS, 63rd Sri Lanka Assoc. Advmt. Sci., E1, 508,  Dec. 2007.
    57. Radial velocity study of close binary star-S Ant using 45 cm Cassegrain telescope at Artur C Clarke Institute, J Adassuriya, S Gunasekera, I Medagangoda, J Fernando and K P S C Jayaratne, 63rd Sri Lanka Assoc. Advmt. Sci., E1, 508,  Dec. 2007.
    58. Estimation of the astronomical Unit using the contact timings at the Transit of Venus Saraj Gunasekara1, Indika Medagangoda1, Jayathu Fernando1, Hasitha Wijethilaka1, and Chandana Jayarathne2*,61st  Sri Lanka Assoc. Advmt. Sci., E1,  Dec. 2005.
    59. Use of satellites images as a tool to estimate tsunami destruction and to identify mitigatory measures, K P S C Jayaratne * and Hasitha Wijethilake2, 61st Sri Lanka Assoc. Advmt. Sci., E1,  Dec. 2005.
    60. Application of Scientific Methodology in Spiritual Development, Dr. Chandana Jayaratne SISHV Dialogue 2 seminar abstracts, Society for the Integration of Science and Human Values, Department of     Pali and Buddhist Studies, University of Peradeniya, Sri Lanka, 24.09.2005.
    61. Generation of Hertzsprung-Russel (H-R) diagram using Pleiades Cluster stars to assess the suitability of ACCIMT telescope for photometric studies N L Dediyagala, G M L P Aponsu, J A P Bodhika, R A S Saraj Gunasekara and K P S Chandana Jayarathne, 60th Sri Lanka Assoc. Advmt. Sci., E1,  Dec.2004.
    62. Power plant emissions in Colombo as a tool for urban planning, K G T Dharshana , K P S C Jayaratne *, R P Samarakkody , 1st National Symposium on Air Resource Management in Sri Lanka, 2004
    63. Ozone column density variation over Sri Lanka, J A P Bodhika1 and K P S C Jayaratne2*, 59th Sri Lanka Assoc. Advmt. Sci., E1, 524,  Dec.2003.
    64. Spectrometric study of stars using ACCIMT telescope, J Adassuriya1*, K P S C Jayaratne, S  Gunasekera , 59th Sri Lanka Assoc. Advmt. Sci., E1, Dec.2003.
    65. A low cost portable multipurpose satellite tracking system for Sri Lanka, R S T Kodikara and K P S  C Jayaratne ,59th Sri Lanka Assoc. Advmt. Sci., C, 312,  Dec.2003.
    66. The Minimum Rainfall Requirement to Obtain Potential Yield of  Tea Grown in Sri Lanka, 59th Sri Lanka Assoc. Advmt. Sci., D,  Dec.2003.
    67. Contribution from major power plants to air pollution in two major city centres in Colombo, K G T Dharshana, K P S C Jayaratne, R P Samarakkody and C J Annakkage, 59th Sri Lanka Assoc. Advmt. Sci., E1, 516, Dec.2003.
    68. Influence of rainfall on the effectiveness of an earth electrode in a lightning protection system, S B M S Senevirathne and K P S C Jayaratne , 59th Sri Lanka Assoc. Advmt. Sci., E1, 515,  Dec.2003.
    69. Atmospheric electricity and lightning research in Sri Lanka, K. P. S. C. Jayaratne, 58th Sri Lanka Assoc. Advmt. Sci. Part ii., Presidential address of Section E1, 75-82, Dec.2002.
    70. Spectrometric study of galaxies and nebulas, I L P Indika, K. P. S. C. Jayaratne and N I Medagangoda, 58th Sri Lanka Assoc. Advmt. Sci., E1.515, 219, Dec.2002.
    71. Spectrometric study of stars using ACCIMT telescope, J Adassuriya, K. P. S. C. Jayaratne and S Gunasekera, 58th Sri Lanka Assoc. Advmt. Sci., E1.514, 218, Dec.2002.
    72. Impact of variation of soil properties on the bush stand and productivity of tea lands in Sri Lanka, M K S L D Amarathunga, M A Wijeratne and K. P. S. C. Jayaratne, 55th Sri Lanka Assoc. Advmt. Sci., B.95, 96, Nov.2001.
    73. The study on variation of the productivity of tea lands in the different agro-ecological regions in Sri Lanka, M K S L D Amarathunga, M A Wijeratne and K. P. S. C. Jayaratne, 56th Sri Lanka Assoc. Advmt. Sci., B.205, 49, Nov.2000.
    74. A low cost multi-channel data logger for fair weather atmospheric electricity measurements, R Lelwala and K. P. S. C. Jayaratne, 55th Sri Lanka Assoc. Advmt. Sci., E1.21, 197, Dec.1999.
    75. On the accuracy of locating ground flashes using two or more direction finding stations, D U J Sonnadara, I M K Fernando, S Namasivayam, K. P. S. C. Jayaratne, K R A Bandara, R Lelwala, A B Weerasekera, C Gomes and T R Ariyaratne, 55th Sri Lanka Assoc. Advmt. Sci., E1.08, 187,Dec.1999.
    76. Some features of lighting ground flash activities observed in tropical thunderstorms, A B Weerasekera, I M K Fernando, D U J Sonnadara, R Lelwala, K. P. S. C. Jayaratne, S Namasivayam, K R A Bandara, C Gomes and T R Ariyaratne, 55th Sri Lanka Assoc. Advmt. Sci., E1.07, 186,Dec.1999.
    77. Effects of ambient temperature and evaporation on yield of tea in Sri Lanka, M K S L D Amarathunga, K. P. S. C. Jayaratne and M A Wijeratne, 55th Sri Lanka Assoc. Advmt. Sci., B.81, 99-100, Dec.1999.
    78. Variation of soil degradation in tea lands and its impact on bush debilitation, M K S L D Amarathunga, M A Wijeratne and K. P. S. C. Jayaratne, 55th Sri Lanka Assoc. Advmt. Sci., B.82, 100-101, Dec.1999.
    79. The effect of edaphic factors on yield of tea in Sri Lanka, M K S L D Amarathunga, M A Wijeratne and K. P. S. C. Jayaratne, 55th Sri Lanka Assoc. Advmt. Sci., B.29, 54, Dec.1999.
    80. The role of site selection on lightning ground flashes in an automated lightning detection network, D U J Sonnadara, I M K Fernando, S Namasivayam, T R Ariyaratne, K P S C Jayaratne and K R A Bandara,  Inst. Phys., Sri Lanka;  15(B), 4, March 1999.
    81. Some features of thunderstorm activity in Sri Lanka, K. P. S. C. Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., E1.50, 264-265,Dec.1998.
    82. Examination related anxieties among science undergraduate students in University of Colombo, K. P. S. C. Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., A-42, 33, Dec. 1998.
    83. Preliminary results of implementing an automated system in Sri Lanka to locate lightning ground flashes, I M K Fernando, D U J Sonnadara, K P S C Jayaratne, S Namasivayam, T R Ariyaratne, Proc. Sri Lanka Assoc. Advmt. Sci., E1.24, 247-248,Dec. 1998.
    84. The minimum rainfall requirement to obtain a potential yield of tea in Sri Lanka., M K S L D Amarathunga, K P S C Jayaratne, M A Wijeratne, Proc. Sri Lanka Assoc. Advmt. Sci., B-128, 125-126, Dec. 1998.
    85. Effect of precipitation deficit on tea production in Sri Lanka., M K S L D Amarathunga, M A Wijeratne, K P S C Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., B-129, 126-127, Dec. 1998.
    86. The polarity of thunderclouds observed in Sri Lanka, K. P. S. C. Jayaratne and A. G. Dayananda, Proc. Sri Lanka Assoc. Advmt. Sci., E1-36, 323Dec. 1997.
    87. Multiplicity of negative return strokes of lightning flashes observed in Colombo, G. A. C. Gomes and K. P. S. C. Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., E1-37, 324, 1997.
    88. EXAMINATION RELATED ANXIETIES OF UNIVERSITY STUDENTS WITH SPECIAL ATTENTION TO SCIENCE UNDERGRADUATES, Postgraduate Diploma in Counselling Thesis of K. P. S. C. Jayaratne, November 1997, University of Colombo, Sri Lanka.
    89. Experience of University Student Counselling Activities & Problems of University Students, K. P. S. C. Jayaratne, Introductory workshop on the principles and practices of counselling, University of Peradeniya, Peradeniya, 28-29 Aug. 1997.
    90. Occurrence percentage and characteristics of different lightning flashes by means of radiation field measurements, W. J. M. Samaranayake and K. P. S. C. Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., E1-09, 164-165, Kelaniya, Nov. 1996.
    91. Charge and size distribution of raindrops, W. J. M. Samaranayake and K. P. S. C. Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., E1-10, 165-166, Kelaniya, Nov. 1996.
    92. A low-cost new type of electronic seismometer, W W P S Medis and K P S C Jayaratne, Inst. Phys., Sri Lanka;  12(B), 2, March 1996.
    93. A navel technique for the production of tiny droplets in simulation studies of cloud droplet collision and coalescence process, Y A A Kumara Yapa and K P S C Jayaratne, Inst. Phys., Sri Lanka;  12(B), 4, March 1996.
    94. A review on microsecond scale electric field pulses emitted by lightning discharge G. A. C. Gomes and K. P. S. C. Jayaratne, Inst. Phys., Sri Lanka;  12(B), 7, March 1996.
    95. Number of thunder Days per year and other lightning occurrence characteristics in Colombo thunderstorms, K. P. S. C. Jayaratne and G. A. C. Gomes, Proc. Sri Lanka Assoc. Advmt. Sci., Sci., E1-05, 340-341, Colombo, Nov. 1995.
    96. The determination of lightning charge centre location from two station electrostatic field change measurements, W. J. M. Samaranayake and K. P. S. C. Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., E1-04, 338-340, Colombo, Nov. 1995.
    97. Long wire antenna set-up for the measurement of local, global and extra-terrestrial effects of air-earth conduction current, K. P. S. C. Jayaratne and R. Lelwala, Proc. Sri Lanka Assoc. Advmt. Sci., E1-25, 212, Colombo, Dec. 1994.
    98. Construction consideration of a magnetic direction finder system for the location of lightning in Sri Lanka, K. P. S. C. Jayaratne, M. K. Fernando  and V. Cooray, Proc. Sri Lanka Assoc. Advmt. Sci., E1-24, 211, Colombo, Dec. 1994.
    99. Characteristics of lightning flashes observed in Sri Lanka in the tropics, V. Cooray and K. P. S. C. Jayaratne, Geophys. Res., 99, 21051-21056, 1994.
    100. On the theory of electrification of the atmosphere due to ground water evaporation, K. P. S. C. Jayaratne, J. Inst. Phys., Sri Lanka; 10, 6, 1994.
    101. Electronic speech recognition system, N. A. D. S. M. Dharmatilleke, A. S. Nazareth and K. P. S. C. Jayaratne, J. Inst. Phys., Sri Lanka; 10, 1, Colombo, March 1994.
    102. The lightning HF radiation at 3 MHz during leader and return stroke processes, K. P. S. C. Jayaratne and V. Cooray, J. Atmos. Terr. Phys., 56(4), 493-501, 1994.
    103. A novel technique to measure the body charge of honeybees, K. P. S. C. Jayaratne and H. M. U. P. H. Denuwara, Proc. Sri Lanka Assoc. Advmt. Sci., E1-16,196, Peradeniya, Dec. 1993.
    104. Behaviour of Sri Lankan honeybees in simulated fair-weather and thunderstorm electric field conditions, K. P. S. C. Jayaratne and H. M. U. P. H. Denuwara, Proc. Sri Lanka Assoc. Advmt. Sci., E1-15,195, Peradeniya, Dec. 1993.
    105. Ground-station measurement of size and charge of raindrops from tropical rain clouds, K. P. S. C. Jayaratne & J. P. Gamalath, Inst.  Phys., Sri Lanka,  9, 6-12,  1993.
    106. Preliminary studies on the measurement of air-earth conduction current density in Sri Lanka, K. P. S. C. Jayaratne & R. Lelwala, Inst.  Phys., Sri Lanka,  9,  1-5,  1993.
    107. ON FAIR-WEATHER AND THUNDERSTORM ELECTRICITY – Basis for Construction of an Atmospheric Electrical Station in Sri Lanka, PhD Thesis of K.P.S.C.Jayaratne, February 1992, University of Colombo, Sri Lanka.
    108. HF radiation at 3 MHz from negative lightning discharges to the ground, K. P. S. C. Jayaratne, Proc. Sri Lanka Assoc. Advmt. Sci., E1-12, 134, Colombo, Dec. 1991.
    109. On the nature of tropical lightning observed in Sri Lanka – II, K. P. S. C. Jayaratne, Sri Lanka Assoc. Advmt.  Sci., E1-11, 133, Colombo, Dec. 1991.
    110. On the nature of tropical lightning observed in Sri Lanka – I, K. P. S. C. Jayaratne, Sri Lanka Assoc. Advmt.  Sci., E1-10, 132, Colombo, Dec. 1991.
    111. Correlation between temperature and space charge density fluctuation, P. S. C. Jayaratne,  D. L. N. Jayathilaka, E. Knudsen and R. Kulasekara, Proc. Sri Lanka Assoc. Advmt.  Sci., E1-01,94, Colombo, Dec. 1989.
    112. Design and construction considerations of an EMI hardened lightning instrumentation, V. Scuka, S. Namasivayam, K. P. S. C. Jayaratne and S. Lundquist, Proc. 19th Conf. Lightning Protection, Austria, 1.1 pp. 1-9, 25-29 April 1988.
    113. Polar conductivity profiles of the lower atmosphere under fair-weather conditions, K. P. S. C. Jayaratne, H. G. S. Siriwardane, D. L. N. Jayathilaka, F. L. Karunaratne and S. V. K. Manchanayake, J. Inst. Phys., Sri Lanka; 4, 25-31, Colombo, 1988.
    114. The effect of distorted atmospheric electric field lines on the measurement of small ion densities, P. S. C. Jayaratne, H. G. S. Siriwardane, D. L. N. Jayathilaka, F. L. Karunaratne and S. V. K. Manchanayake, J. Inst. Phys., Sri Lanka;  4, 18-24, Colombo, 1988.
    115. Values of space charge density under fair weather conditions, K. P. S. C. Jayaratne and T. M. R. Tennakoon, Proc. Sri Lanka Assoc. Advmt. Sci., E55,183, Colombo, Dec. 1986.