Publications

  1. Long wave antenna design for CALLISTO System, Supun Liyanaarachchi, Janaka Adassuriya; K P S Chandana Jayaratne, From Innovation to Impact (FITI) Conference, (2021).  https://dio.org/10.1109/FITI54902.2021.9833069                              

  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. Identifying Variable Stars from Kepler Data UsingMachine Learning, J Adassuriya, J A N S S Jayasinghe, K P S C Jayaratne, European Journal of Applied Physics, 332-37, (2021). https://doi.org/10.24018/ejphysics.2021.3.4.93
  4. Asteroseismology of SZ Lyn using multiband high time resolution photometry from ground and space, J Adassuriya, S Ganesh, J L Gutierrez, G Handler, Santosh Joshi, K P S C Jayaratne, K S Baliyan, Monthly Notices of the Royal Astronomical Society, Volume 502, Issue 1, March 2021, Pages 541–555, (2021). https://doi.org/10.1093/mnras/staa3923
  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, Volume 500, , Issue 1, 333-354, 15th Oct., (2020). https://doi.org/10.1093/mnras/staa3110
  6. Determination of oscillation frequencies and stellar properties of three Delta Scuti variable stars using Kepler data, J Adassuriya, K P S C Jayaratne, P T L V Cooray, M L C Attygalle, Journal of the National Science Foundation of Sri Lanka, 48(4), pp.367–378, (2020). http://doi.org/10.4038/jnsfsr.v48i4.9145
  7. 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)
  8. 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, Jeremy 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, Volume 488, Issue 1, 536-546, (2019). https://doi.org/10.1093/mnras/stz1641
  9. 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, (2019).
  10. On the significance of the motions in the gravitational lensing time delays    Gihan Weerasekara,  K P S Chandana Jayaratne and Thulsi Wickramasinghe, Proc. Annul Res. Symposium, University of Colombo, Sri Lanka, 239, (2019).
  11. 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. Annul Res. Symposium, University of Colombo, Sri Lanka, 222, (2019).
  12. Light travel time effect of the binary orbit of SZ Lyn, J. Adassuriya, K.P.S. C. Jayaratne, and S. Ganesh, Journal of Sri Lanka Association for the Advancement of Science (SLAAS), 1, 54-65, (2018).
  13. 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).
  14. 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, Berlin, Germany, (2018).
  15. Astrossiomolgy of of SZ Lyn using very high resolution photometery 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, (2018), http://doi.org/10.5281/zenodo.1463699 Oct. 2018.
  16. 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, Peradeniya, Sri Lanka (2018).
  17. Orbital elements of SZ Lyn, J Adassuriya, K P S C Jayaratne, S Ganesh, 74th   Sri Lanka Assoc. Advmt. Sci., E1-509,  (2018).
  18. 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,  (2018).
  19. 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,  (2018).
  20. Space Science and Technology Applications for Sustainable Development, K P S Chandana Jayaratne, 74th Sri Lanka Assoc. Advmt. Sci., Part-ii,pp 1-7, (2018). 
  21. 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. Annul Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, (2018).
  22. 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. Annul Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, (2018).
  23. 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. Annul Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, (2018).
  24. 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. Annul Res. Symposium, University of Colombo, Sri Lanka, Nov. 09, (2018).
  25. 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).
  26. 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).
  27. 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).
  28. 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).
  29. Fermi-Lat GeV Flux Observation of the BL Lacertae Object, K L I Gunawardhana, K P S C Jayaratne, A U Abeysekara,   73rd   Proc. Sri Lanka Assoc. Advmt. Sci., E1-511,  Dec. (2017).
  30. 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, Annul Res. Symposium, University of Colombo, Nov. 17, (2017).
  31. 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, Annul Res. Symposium, University of Colombo, Nov.17, (2017).
  32. Light curve analysis of CC Andromeda, J Adassuriya, K P S C Jayaratne, S. Ganesh, Annul Res. Symposium, University of Colombo, Nov. 17, (2017).
  33. 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  Proc. of the Institute of Physics, Sri Lanka, pp 24-30, March (2017).
  34. A study of the relationship between the sunspot number and some aspects of  weather pattern 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). 
  35. 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. Annul Res. Symposium, University of Colombo, p 266, Oct. 11-22, (2016).
  36. 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. Annul Res. Symposium, University of Colombo, p 268, Oct. 11-22, (2016).
  37. 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).
  38. 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).
  39. 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). 
  40. 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, (2015). doi: 10.11648/j.ajaa.20150303.16
  41. 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). 
  42. Effect of solar activity on the occurrence of weather extreme events, K 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).
  43. 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).
  44. 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).
  45. 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).
  46. Effect of meteoritic dust on the variation of global rainfall, Upali Jayasinghe, K P S Chandana Jayaratne, Proc. Annul Res. Symposium, University of Colombo, p 160, Oct 3-4, (2013).
  47. 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).
  48. 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).
  49. 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).
  50. 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).
  51. Depth Dependency 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).
  52. 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).
  53. 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 I Medagangoda, International Intradisciplinary  Conference on the frontiers of astronomy, Mangalore University, India. 28-30 Dec (2009).
  54. 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).
  55. 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).
  56. Estimation of the astronomical Unit using the contact timings at the Transit of Venus Saraj Gunasekara, Indika Medagangoda, Jayathu Fernando, Hasitha Wijethilaka, and Chandana Jayarathne,61st  Sri Lanka Assoc. Advmt. Sci., E1,  Dec. (2005).
  57. Use of satellites images as a tool to estimate tsunami destruction and to identify mitigatroy measures, K P S C Jayaratne and Hasitha Wijethilake, 61st Sri Lanka Assoc. Advmt. Sci., E1,  Dec. (2005).
  58. 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).
  59. Ozone column density variation over Sri Lanka, J A P Bodhika and K P S C Jayaratne, 59th Sri Lanka Assoc. Advmt. Sci., E1, 524,  Dec.(2003).
  60. 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).
  61. 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).
  62. 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).
  63. 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).
  64. 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).
  65. 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. 5th United Nations/European Space Agency Workshop on Basic Space Science – From Small Telescopes to Space Missions, Session 03,  Jan 11-13, (1996).
  66. 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).