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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 6
Ann. Geophys., 20, 807–815, 2002
https://doi.org/10.5194/angeo-20-807-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 807–815, 2002
https://doi.org/10.5194/angeo-20-807-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Jun 2002

30 Jun 2002

Diurnal, seasonal and latitudinal variations of electron temperature measured by the SROSS C2 satellite at 500 km altitude and comparison with the IRI

P. K. Bhuyan1, M. Chamua2, P. Subrahmanyam2, and S. C. Garg2 P. K. Bhuyan et al.
  • 1Department of Physics, Dibrugarh University, Dibrugarh 786 004, India
  • 2Radio and Atmospheric Science Division, National Physical Laboratory, New Dehli 110 012, India
  • Correspondence to: P. K. Bhuyan (bhuyan@dibru.ernet.in)

Abstract. The diurnal, seasonal and latitudinal variations of electron temperature Te, measured by the SROSS C2 satellite at equatorial and the low-latitudes during the low solar activity period of 1995–1997 are investigated. The average height of the satellite was ~ 500 km and it covered the latitude belt of –31° to 34° and the longitude range of 40°–100°. Te varies between 700–800 K during night-time (20:00–04:00 LT), rises sharply during sunrise (04:00–06:00 LT) to reach a level of ~ 3500 K within a couple of hours and then falls between 07:00–10:00 LT to a daytime average value of ~ 1600 K. A secondary maximum is observed around 16:00–18:00 LT in summer. Latitudinal gradients in Te have been observed during the morning enhancement and daytime hours. Comparison of measured and International Reference Ionosphere (IRI) predicted electron temperature reveals that the IRI predicts nighttime Te well within ~ 100 K of observation, but at other local times, the predicted Te is less than that measured in all seasons.

Key words. Ionosphere, equatorial ionosphere, plasma temperature, and density

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