Solar activity dependence of electron and ion temperatures using SROSS C2 RPA data and comparison with IRI model

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Scientific paper

Electron and ion temperature (Te and Ti) data observed using RPA on board SROSS C2 satellite are investigated for the variation with local time, season, latitude (0 30°N geographic) over a half of a solar cycle (1995 2000). The nighttime Te (˜1000 K) is independent of the season and the solar flux whereas Ti exhibits positive correlation with the solar activity during all three seasons. In the early morning hours during summer, Te is higher by ˜500 K than other seasons in all three levels of solar activity. During winter and equinox in the early morning hours, Te and Ti are higher during low solar activity, showing a negative correlation with solar flux. During daytime, the Ti increases with the solar flux in winter and summer solstice, but is independent in equinox. IRI underestimates Te and Ti during the morning period by 50 75% in the equatorial and near-equatorial stations during all levels of solar activities.

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