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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 5
Ann. Geophys., 22, 1665–1674, 2004
https://doi.org/10.5194/angeo-22-1665-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 1665–1674, 2004
https://doi.org/10.5194/angeo-22-1665-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Apr 2004

08 Apr 2004

Observation of periodic fluctuations in electron and ion temperatures at the low-latitude upper ionosphere by SROSS-C2 satellite

S. R. Prabhakaran Nayar1, L. T. Alexander1, V. N. Radhika1, T. John2, P. Subrahmanyam2, P. Chopra2, M. Bahl2, H. K. Maini2, V. Singh2, D. Singh2, and S. C. Garg2 S. R. Prabhakaran Nayar et al.
  • 1Department of Physics, University of Kerala, Trivandrum, 695 581, India
  • 2Radio and Atmospheric Science Division, National Physical Laboratory, New Delhi, 100 010, India

Abstract. The electron and ion temperature at the low-latitude ionosphere exhibits a wide variety of fluctuations. Observations using SROSS-C2 satellite RPA payload during 1995–2000 provide an excellent opportunity to study the fluctuations in Te and Ti in the upper ionosphere and to understand the dynamic processes existing at those altitudes. The spectral analysis of electron and ion temperatures using Fourier and wavelet techniques reveal the presence of quasi-periodicities, such as 14-day, 19-day, 27-day, 55-day, 154-day, 180-day, 1-year and 1.3-year periods. The daytime and nighttime values of Te and Ti exhibit different types of characteristic variations. The wavelet spectrum presented depicts the temporal evolution the power of each periodicity present in the daytime and nighttime values of Te and Ti. The time evolution of electron and ion temperatures are compared with that of Ap and 10.7cm solar radio flux, to infer the source of temperature fluctuations at the upper ionosphere.

Key words. Ionosphere (plasma temperature and density)

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