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Solar flux variation of the electron temperature morning overshoot in the equatorial F region
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SYSNO ASEP 0366447 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Solar flux variation of the electron temperature morning overshoot in the equatorial F region Author(s) Stolle, C. (DK)
Liu, H. (JP)
Truhlík, Vladimír (UFA-U) RID, ORCID
Lühr, H. (DE)
Richards, G. (US)Source Title Journal of Geophysical Research - ISSN 0148-0227
Roč. 116, - (2011), A04308/1-A04308/13Number of pages 13 s. Language eng - English Country US - United States Keywords IONOSPHERIC PHOTOELECTRON FLUX ; MODEL ; DENSITY ; ATMOSPHERE ; ION Subject RIV DG - Athmosphere Sciences, Meteorology R&D Projects GAP209/10/2086 GA ČR - Czech Science Foundation (CSF) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000289644900005 DOI 10.1029/2010JA016235 Annotation Using 8 years of CHAMP satellite observations of the equatorial electron temperature, T(e), we investigate its behavior during the morning overshoot and at ionospheric altitudes below 450 km including its variation with solar activity. The morning T(e) has a maximum at the dip equator and decreases gradually with increasing latitude, which is due to the increasing importance of heat conduction as the dip angle becomes larger. The amplitude of the equatorial morning overshoot T(e) decreases with increasing solar flux by about -10 degrees K/solar flux unit depending on season and longitude. Trends of similar magnitude are predicted by the FLIP model. The model calculations confirm that the electron cooling due to enhanced electron-ion collisions increases faster than the heating of thermal electrons through collision with photoelectrons for increasing solar EUV. Both data and model showed that elevated electron temperatures persist to later local times during low solar activity. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2012 Electronic address http://www.agu.org/pubs/crossref/2011/2010JA016235.shtml
Number of the records: 1