Dr. D. Pallamraju

Professor and Chairman
Space and Atmospheric Sciences Division
Telephone: +91-79-2631-4658

Research Interests

Investigations of upper atmospheric phenomena and their associated effects on the neutral and plasma dynamics are carried out using all-sky daytime optical measurements from various regions on the ground. By simultaneous measurements over a large field-of-view on emissions that originate from multiple altitudes, investigations are carried out on vertical coupling of upper atmospheric regions. Space weather effects at various latitudes is pursued using various ground and satellite based instrumentation.


Jan 2019 - present:
Chairman, Space and Atmospheric Sciences Division at the Physical Research Laboratory, Ahmedabad, India.
July 2013 - present:
Professor at the Physical Research Laboratory, Ahmedabad, India.
April 2012 - March 2015:
Chairman, Space and Atmospheric Sciences Division at the Physical Research Laboratory, Ahmedabad, India.
November 2007 - June 2013:
Associate Professor at the Physical Research Laboratory, Ahmedabad, India.
January 2004 - 2008:
Scientific Coordinator for CAWSES, an International program of SCOSTEP (Scientific Committee on Solar-Terrestrial Physics). CAWSES office has been established at the Center for Space Physics in Boston University, USA.
January 2002 - October 2007:
Senior Research Associate at the Center for Space Physics, Boston University, USA.
June 1997 - December 2001:
Research Associate at the Center for Space Physics, Boston University, USA.
March 1996 - May 1997:
Post-Doctoral Fellow at the Physical Research Laboratory, Ahmedabad, India.
August 1990 - February 1996:
Research Scholar at the Physical Research Laboratory, Ahmedabad, India.


Life Member, American Geophysical Union (AGU)
Member, Asia Oceania Geosciences Society (AOGS) (2009 - present).
Associate, Committee on Space Research (COSPAR) (2002 - present).

Professional Services / Recognitions:

  • Invited as an Expert for defining the International Scientific Program of the SCOSTEP (Scientific Committee on Solar Terrestrial Physics). Meeting was held at National Space Science Institute, Beijing, during 13 - 16 November 2018.
  • Chair, Scientific Organizing Committee & Convener of the 15th International Symposium on Equatorial Aeronomy (ISEA-15): hosted by PRLduring October 22 - 26, 2018 ISEA-15 .
  • Member, Editorial Board: Earth, Planets, and Space (EPS) (2018-2021).
  • Member, Editorial Board: Indian Journal of Radio and Space Physics (IJRSP) (2015 - present).
  • Guest Editor, Annales Geophysicae (AG) Special Issue on 14th International Symposium on Equaotrial Aeronomy (2016-2017).
  • Member, Science Steering Committee, Solar-Terrestrial Atmospheric Research Program (STARP-India) (2014 - present).
  • One of the group leaders of the ROSMIC (Role of the Sun and the Middle atmosphere/thermosphere/ionosphere In Climate) project of VarSITI (Variability of the Sun and Its Terrestrial Impacts) program (2013 - present).
  • Vice-Chair of the Sub-Commission C1 on "The Earth's Upper Atmosphere and Ionosphere" of COSPAR (Committee on Space Research) for the period 2012 - 2020.
  • Science Discipline Representative (SDR) to the Scientific Committee on Solar-Terrestrial Physics (SCOSTEP) (2011 - present). SDRs are also members of the SCOSTEP General Council.
  • Secretary of the Solar-Terrestrial (ST) section of the Asia Oceania Geosciences Society (AOGS) (2011 - 2015).
  • Member Secretary, Board of Studies, Centre for Space Science and Technology Education in Asia and the Pacific (CSSTEAP) (Affiliated to the United Nations) (2011 - present).
  • Member, CAWSES-India Phase II Science Steering Committee (2009 - 2015)
  • Member, CAWSES-II Task Group 4 on What is the geospace response to variable waves from the lower atmosphere? (2009 - 2012)
  • Managing Guest Editor Journal of Atmospheric and Solar Terrestrial Physics (JASTP) Special Issue: Atmospheric Coupling Processes in the Sun-Earth System
  • Member, Board of Studies, University of Pune, Pune (2010 - 2012).
  • Peer Reviewer in National Aeronautics and Space Administration (NASA) and National Science Foundation (NSF), USA Review Panels.

  • Scientific Publications in Peer-Reviewed Journals

    1. Laskar, F. I., Stober, G., Fiedler, J., Oppenheim, M. M., Chau, J. L., Pallamraju, D., Pedatella, N. M., Tsutsumi, M., and Renkwitz, T.: Mesospheric Anomalous Diffusion During Noctilucent Clouds, Atmos. Chem. Phys., 2019.
    2. Singh, R. P., and D. Pallamraju (2018), Results on mesospheric temperature inversions observed in OH and O2 rotational temperatures from Mount Abu (24.6 N, 72.8 E), India, J. Geophys. Res. 123, 8823 - 8834.
    3. Karan, D. K., and D. Pallamraju (2018), Effect of geomagnetic storms on the daytime low-latitude thermospheric wave dynamics, J. Atmos. Sol.-Terr. Phys., 170, 35-47.
    4. Karan. D. K., and D. Pallamraju (2017), Small-scale longitudinal variations in the daytime equatorial thermospheric wave dynamics as inferred from oxygen dayglow emissions, J. Geophys. Res.- Space Phys. 122, doi:10.1002/ 2017JA023891.
    5. Singh, R. P., and D. Pallamraju (2017), Near Infrared Imaging Spectrograph (NIRIS) for ground-based mesospheric OH(6-2) and O2(0-1) intensity and temperature measurements, J. Earth Syst. Sci. 126:88.
    6. Singh, R. P., and D. Pallamraju (2017), Large- and small-scale periodicities in the mesosphere as obtained from variations in O2 and OH nightglow emissions, Ann. Geophys. 35, 227-237.
    7. Karan, D. K., D. Pallamraju, K. Phadke, T. Vijayalakshmi, T. K. Pant, S. Mukherjee (2016), Electrodynamical influence on the diurnal behaviour of neutral daytime airglow emissions, Ann. Geopyhs., 34, 1019-1030.
    8. Singh, R. P., and D. Pallamraju (2016), Effect of cyclone Nilofar on mesospheric wave dynamics as inferred from optical nightglow observations from Mt. Abu, India, J. Geophys. Res., doi: 10.1002/2016JA022412
    9. Pallamraju, D., D. K. Karan, and K. A. Phadke (2016), First three dimensional wave characteristics in the daytime upper atmosphere derived from ground-based multiwavelength oxygen dayglow emission measurements, Geophys. Res. Lett. , 42, doi: 10.1002/2016GL069074.
    10. Yadav, S., and D. Pallamraju (2015), On the coupled interactions between Ring current intensity and high-latitude ionospheric electron density variations, J. Atmos. Sol.-Terr. Phys., 125-126, 50-58, 2015, doi:10.1016/j.jastp.2015.02.006
    11. Pramitha, M., M. Venkat Ratnam, A. Taori, B. V. Krishna Murthy, D. Pallamraju, and S. Vijaya Bhaskar Rao (2015), Evidence for tropospheric wind shear excitation of highphase- speed gravity waves reaching the mesosphere using the ray-tracing technique, Atmos. Chem. Phys., 15, 2709-2721, 2015, doi:10.5194/acp-15-2709-2015.
    12. Singh, R. P., and D. Pallamraju (2015), On the Latitudinal Distribution of Mesospheric Temperatures During Sudden Stratospheric Warming Events, J. Geophys. Res., Space Phys., 119, doi:10.1002/2014JA020355.
    13. Laskar, F. I., D. Pallamraju, B. Veenadhari, T. Vijaya Lakshmi, M. Anji Reddy, and S. Chakrabarti (2015), Gravity waves in the thermosphere: Solar activity dependence, Adv. Space Res., 55(2015), pp 1651-1659.
    14. Laskar, F. I., and D. Pallamraju (2015), Does sudden stratospheric warming induce meridional circulation in the mesosphere thermosphere system? J. Geophys. Res. Space Phys., 119, 10133-10143, doi:10.1002/2014JA020086
    15. Pallamraju, D., , S. Gurubaran, and M. Venkat Ratnam (2014), A brief overview on the special issue on CAWSES-India Phase II program, J. Atmos. Sol.-Terr. Phys., 121, pp 141-144.
    16. Laskar, F. I., D. Pallamraju , and B. Veenadhari (2014), Vertical coupling of atmospheres: Dependence on strength of sudden stratospheric warming and solar activity, Earth, Planets and Space, 66(1), 1-10.
    17. Pramitha, M., M. Venkat Ratnam, Alok Taori, B. V. Krishna Murthy, D. Pallamraju, and S. Vijaya Bhaskar Rao, (2014), Identification of gravity wave sources using reverse ray tracing over Indian region, Atmos. Chem. Phyis. Discuss., 14, 19587-19623, doi:10.5194/acpd-14-19587-2014,2014.
    18. Bagiya, M. S., R. Hazarika, F. I. Laskar, S. Sunda, S. Gurubaran, D. Chakrabarty, P. K. Bhuyan, R. Sridharan, B. Veenadhari, and D. Pallamraju, (2014), Effects of prolonged southward interplanetary magnetic field on low-latitude ionospheric electron density, J. Geophys. Res. Space Physics, 119, 5764-5776, doi:10.1002/ 2014JA020156.
    19. Pallamraju, D., J. Baumgardner, R. P. Singh, F. I. Laskar, C. Mendillo, T. Cook, S. Lockwood, R. Narayanan, T. K. Pant, and S. Chakrabarti (2014), Daytime wave characteristics in the mesosphere lower thermosphere region: Results from the Balloon-borne Investigations of Regional-atmospheric Dynamics experiment, J. Geophys. Res. Space Physics, 119,2229 - 2242, doi:10.1002/2013JA019368.
    20. Laskar, F. I., D. Pallamraju, T. Vijaya Lakshmi, M. Anji Reddy, B. M. Pathan, and S. Chakrabarti (2013), Investigations on vertical coupling of atmospheric regions using combined multiwavelength optical dayglow, magnetic, and radio measurements, J. Geophys. Res. Space Physics, 118, 4618-4627, doi:10.1002/jgra.50426.
    21. Pallamraju, D., F. I. Laskar, R. P. Singh, J. Baumgardner, and S. Chakrabarti (2013), MISE: A Multiwavelength Imaging Spectrograph using Echelle grating for daytime optical aeronomy investigations, J. Atmos. Sol-Terr. Phys., 103, 176 - 183.
    22. Sekar, R., S. P. Gupta, Y. B. Acharya, D. Chakrabarty, D. Pallamraju, B. M. Pathan, D. Tiwari, and R. K. Choudhary (2013), Absence of streaming plasma waves over Thumba in recent times: Is it related to the drift of the dip equator?, J. Atmos. Sol-Terr. Phys., 103, pp. 8 - 15.
    23. Pallamraju, D., G. Lu, and C. Lin (2012), Overview of the Special issue on the Atmospheric Coupling Processes in the Sun-Earth System, J. Atmos. Sol-Terr. Phys., 75 - 76, pp. 1 - 4.
    24. Sekar, R., D. Chakrabarty, D. Pallamraju (2012), Optical signature of shear in the zonal plasma flow along with a tilted structure associated with Equatorial Spread F during a space weather event, J. Atmos. Sol-Terr. Phys. 75-76, pp 57-63.
    25. Pallamraju, D., S. Chakrabarti, and S. Solomon (2011), On deriving auroral particle fluxes in the daytime using combined ground-based optical and radar measurements, J. Geophys. Res., 116, A04309, doi:10.1029/2010JA015934.
    26. Das, U., D. Pallamraju, S. Chakrabarti (2010), Effect of an X-class solar flare on the OI 630.0nm dayglow emission, J. Geophys. Res., 115, A08302, doi:10.1029/2010JA015370. Selected as AGU Editor's Choice "Space Weather" August 2012.
    27. Pallamraju, D., U. Das, S. Chakrabarti, (2010), Short- and long-timescale thermospheric variability as observed from OI 630.0 nm dayglow emissions from low-latitudes, J. Geophys. Res., 115, A06312, doi:10.1029/2009JA015042.
    28. Prakash, S., D. Pallamraju, and H. S. S. Sinha (2009), Role of the equatorial ionization anomaly in the development of the evening prereversal enhancement of the equatorial zonal electric field, J. Geophys. Res., 114, A02301, doi:10.1029/2007JA012808.
    29. Pallamraju, D., and S. Chakrabarti, Contributions of Imaging Echelle Spectrographs to Daytime Optical Aeronomy, J. Atmos. Sol-Terr. Phys., 58, 1459 - 1471, 2006.
    30. Chakrabarti, S., and D. Pallamraju, Round the clock ground-based imaging spectroscopy of space weather effects on the thermosphere and ionosphere, Advances in Geosciences, Volume2: Solar Terrestrial (ST) Science, Editor-in-Chief: Wing-Huen Ip. Volume Editor-in-Chief: Marc Duldig. pp 201 - 218, 2006.
    31. Basu, S., and D. Pallamraju, Science rationale for Climate and Weather of the Sun Earth System (CAWSES): SCOSTEP's interdisciplinary program for 2004-2008, Advances in Space Research , 38, 1781 - 1791, 2006.
    32. Basu, Su, Sa Basu, J. Makela, R. Sheehan, E. MacKenzie, P. Doherty, J. W. Wright, M. J. Keskinen, D. Pallamraju, L. Paxton, F. T. Berkey, (2005). Two components of ionospheric plasma structuring at midlatitudes observed during the large magnetic storm of October 30, 2003, Geophys. Res. Lett., 32, L12S06, doi:10.1029/2004GL021669. Selected as AGU Editor's Choice "Space Weather" May 2005.
    33. Pallamraju, D., and S. Chakrabarti, (2005) First ground-based measurements of OI 6300 A Daytime aurora Over Boston in Response to the 30 October 2003 geomagnetic Storm, Geophys. Res. Lett., , 32, L03S10, doi:10.1029/2004GL021417.
    34. Pallamraju, D., S. Chakrabarti, R. Doe and T. Pedersen, First Ground-based OI 630 nm optical measurements of daytime cusplike and F-region auroral precipitation, Geophys. Res. Lett., 31, L08807 doi:10.1029/2003GL019173, (2004).
    35. Pallamraju, D., S. Chakrabarti and C. E. Valladares, Magnetic Storm Induced Enhancement in Neutral Composition at Low-latitudes as Inferred by O(1D) Dayglow Measurements From Chile, 22, 3241-3250, Annales Geophysics, 2004.
    36. Galand, M., J. Baumgardner, D. Pallamraju, S. Chakrabarti, U. P. Lovhaug, D. Lummerzheim, B. Lanchaster, and M. H. Rees, (2004) Spectral imaging of proton aurora and twilight at Tromso, Norway, Journal of Geophysical Research, 109, A07305, doi:10.1029/2003JA010033.
    37. Pallamraju, D., J. Baumgardner and S. Chakrabarti, HIRISE: A ground-based High Resolution Imaging Spectrograph using Echelle grating for measuring daytime airglow and auroral emissions, J. Atmos. Solar-Terr. Phys., 64 , 1581-1587, 2002.
    38. Chakrabarti, S., D. Pallamraju, J. Baumgardner and J. Vaillancourt, HiTIES: A High Throughput Imaging Echelle Spectrograph for Ground-Based Visible Airglow and Auroral Studies, J. Geophys. Res.,106, 30337-30348, 2001.
    39. Pallamraju, D., J. Baumgardner, S. Chakrabarti and T. R. Pedersen, Simultaneous ground-based observations of an auroral arc in daytime O I 630.0nm emission and by Incoherent Scatter Radar, J. Geophys. Res., 106, 5543-5549, 2001.
    40. Pallamraju D., J. Baumgardner, and S. Chakrabarti, A multiwavelength investigation of the Ring effect in the day sky spectrum, Geophys. Res. Lett., 27, 1875-1878, 2000.
    41. Sridharan R., D. Pallamraju, V. V. Somayajulu, Alok Taori, D. Chakrabarty and R. Raghavarao, Imprint of equatorial electrodynamics in the OI 630.0nm dayglow J. Atmos. and Solar Terr. Phys., 61, 1143-1155, 1999.
    42. Pallamraju D., and R. Sridharan, Ground-based optical measurements of daytime aurora -- a new means of investigating space-weather related processes, Proc. Indian Acad. of Sci. (Earth Planet Sci.), 107, 203-211, 1998.
    43. R. Sridharan, N. K. Modi, D. Pallamraju, R. Narayanan, Tarun K Pant, Alok Taori, and D Chakrabarty, A Multiwavelength Daytime Photometer -- a new tool for the investigation of atmospheric processes, Measurement Sci. and Tech., 9,, 585-591, 1998.
    44. Pallamraju, D., and R. Sridharan, High-resolution 2-D maps of OI 630.0nm thermospheric dayglow from equatorial latitudes, Ann. Geophys., 16, 997-1006, 1998.
    45. R. Sridharan, H. Chandra, S. R. Das, H.S.S. Sinha, D. Pallamraju, R. Narayanan, S. Raizada, R. N. Misra, R. Raghavarao, G. D. Vyas, P. B. Rao, P. V. S. Ramarao, V. V. Somayajulu, V. V. Babu and A. D. Danilov, Ionization hole capmaign -- A coordinated rocket and ground-based study at the onset of equatorial spread-F - First results, J. Atmos. Terr. Phys., 59, 2051, 1997.
    46. Pallamraju, D., R.Sridharan, S.Gurubaran, and R. Raghavarao, First results from ground-based daytime optical investigations of the development of the Equatorial Ionization Anomaly, Ann. Geophys., 14, 238-245, 1996.
    47. Pallamraju, D., R. Sridharan, R. Narayanan, N. K. Modi, R. Raghavarao, and B. H. Subbaraya, Ground-based optical observations of daytime auroral emissions from Antarctica, J. Atmos. Terr. Phys., 57, 1591-1597, 1995.
    48. R. Sridharan, D. Pallamraju, R. Narayanan, N. K. Modi, B. H. Subbaraya, and R. Raghavarao, Daytime measurements of optical auroral emissions from Antarctica, Curr. Sci., 68, 830-833, 1995.
    49. Sridharan R., D. Pallamraju, R. Raghavarao and P. V. S. Ramarao, Precursor for Equatorial Spread-F in OI 630.0 nm dayglow, Geophys. Res. Lett., 21, 2797-2800, 1994.
    50. Sridharan R., R. Narayanan, N. K. Modi and D. Pallamraju, A novel mask design for multiwavelength dayglow photometry, Appl. Opt., 32, 4178-4180, 1993.

      Refereed Technical Reports/ Publications in Proceedings:

    51. Choithani, V., R. Jain, and D. Pallamraju, Study of solar flares associated with Geoeffective CMEs, International Astronomical Union Proceedings, 2018 (Accepted).
    52. Pallamraju, D., and S. Solomon, Role of the Sun and the Middle Atmosphere/Thermosphere/Ionosphere In Climate (ROSMIC)" VarSITI Newsletter, Vol. 4, pp3-4, November 2016.
    53. Phadke, K. A., R. Narayanan, R. P. Singh, and D. Pallamraju, An Automated CCD-based Multi-wavelength Airglow Photometer (CMAP) for Optical Aeronomy Studies, PRL Technical Note-2014-107, 2014.
    54. Singh, R. P, D. Pallamraju, R. Narayanan, Development of Automated Digital Optical Imagers for Rocket Trail Photography, PRL Technical Note-102, 2013.
    55. Pallamraju, D., Optical Aeronomy Studies at Physical Research Laboratory, India, CAWSES Task Group 4 Newsletter, Vol. 8, pp 4-5, April 2012.
    56. Pallamraju, D., Optical Investigations of Mesosphere and Lower Thermosphere (MLT) Region, Proceedings of the DST workshop on Growth of Geomagnetism: Challenges and Opportunities in the next two decades, Indian Institute of Geomagnetism, New Panvel, Mumbai, 12 - 13 December 2011.
    57. P. Shah and D. Pallamraju, Real-time automated software for operati on of multiple CCD cameras and interfacing with the balloon telemetry, PRL Technical Note-99 2011.
    58. R. Sekar, Y. B. Acharya, D. Chakrabarty, D. Pallamraju, S. P. Gupta, and B. M. Pathan, Investigations on the effects of annular solar eclipse in the equatorial ionosphere Proceedings of the National Workshop: Results on Solar Eclipse (NaWRoSE), SPL, VSSC, January 27-28, 2011.
    59. Pallamraju, D., Optical signatures of Space Weather disturbances, Proceedings of National Workshop on Atmospheric and Space Sciences, Calcutta University, Calcutta, 23-24 November 2010
    60. Pallamraju, D., Optical Observations, Proceedings of the SERC-DST school on Space Weather, Indian Institute of Geomagnetism, Mumbai, April 2010.
    61. Pallamraju, D., Introduction to Space Weather and the Status of Forecast Methodologies, Proceedings of the SERC-DST school on Aviation Meteorology with Special Emphasis on Modern Observational Techniques and Nowcasting, Air Force Administrative College, Coimbatore, December 2008.
    62. Pallamraju, D., A combined optical and modeling approach to estimate the incident particle fluxes into the Earths's atmosphere, Proceedings of the Energetic Coupling of Atmospheric Regions, Mumbai, India, 2008.
    63. Pallamraju, D., Climate and Weather of the Sun-Earth System, Proceedings of the SERC-DST school on Atmospheric and Space Sciences, Andhra University, Visakhapatnam, September 2008.
    64. Pallamraju, D., Space Weather effects on the Geospace, Proceedings of National Seminar on Emerging Trends in Space and Aviation Meteorology, New Delhi, February, 2008.
    65. S. Basu and D. Pallamraju, Science rationale for CAWSES (Climate and Weather of the Sun-Earth System): SCOSTEP's interdisciplinary program for 2004- 2008, Proceedings of the Radio Beacon Symposium, Boston, 2004.
    66. Pallamraju, D., Applications of optical spectrographs for passive remote sensing of upper atmosphere, Proceedings of the CEDAR Passive Aeronomy Workshop, 2004.
    67. Pallamraju, D., Highlight 1: First ground-based observati ons of daytime cusp and F-region auroral precipitation, Proceedings of the CEDAR Passive Aeronomy Workshop, 2004.
    68. Pallamraju, D., Highlight 2: Daytime Redline Aurora over Boston, Proceedings of the CEDAR Passive Aeronomy Workshop, 2004.
    69. R. Sridharan, D. Pallamraju, N. K. Modi and R. Narayanan, Report on the scientific activities under the 'Optical Aeronomy' programme carried out during the XIV scientific expedition (summer component), Fourteenth Indian Expedition to Antarctica, Scientific Report, Technical Publication No. 12, pp 71-91, 1998.
    70. R. Sridharan, D. Pallamraju, R. Narayanan, and N. K. Modi, Optical Aeronomy from Antarctica - Measurements of daytime auroral emissions, Thirteenth Indian Expedition to Antarctica, Scientific Report, Technical Publication No. 11, pp 47 - 68, 1997.

      Ph.D. Students

      - Fazlul I. Laskar (2014): Winner of the GSA-CHARUSAT Best Thesis Award for the year 2014 (presently PDF at IAP, Kuhlungsborn, Germany)
      - Deepak K. Karan (2017): Winner of the GSA-CHARUSAT Best Thesis Award for the year 2017 (presently PDF at PRL)
      - Ravindra P. Singh (2017) (presently Scientist SE-(Tech) at PRL)
      - Subir Mandal (presently working as a SRF)
      - Sovan Saha (presently working as a JRF)

      Post Doctoral Fellows

      - Dr. Uma Das (2008 - 2010) (presently at IIIT, Kalyani, India)
      - Dr. Suneel Krishna (2010 - 2011) (presently at IIT Roorkee, India)
      - Dr. Sneha Yadav (2013 - 2015) (presently at SPL, Trivendrum, India)
      - Dr. Fazlul Laskar (2014 - 2015) (presently at IAP, Kuhlungsborn, Germany)
      - Dr. Deepak K. Karan (2017 - present)

      Interactions with Media

      - Pole Vault (Printed in Deccan Chronicle ; Sunday edition of 16 Dec. 2001)

    71. Other Links

      - Additional information and CV
      - List of publications as recorded in Google Scholar
      - You can view my publications on ResearchGate