Solar flux variation of the electron temperature morning overshoot in the equatorial F region

0366447 - ÚFA 2012 RIV US eng J - Článek v odborném periodiku
Stolle, C. - Liu, H. - Truhlík, Vladimír - Lühr, H. - Richards, G.
Solar flux variation of the electron temperature morning overshoot in the equatorial F region.
Journal of Geophysical Research. Roč. 116, - (2011), A04308/1-A04308/13. ISSN 0148-0227
Grant CEP: GA ČR GAP209/10/2086
Výzkumný záměr: CEZ:AV0Z30420517
Klíčová slova: IONOSPHERIC PHOTOELECTRON FLUX * MODEL * DENSITY * ATMOSPHERE * ION
Kód oboru RIV: DG - Vědy o atmosféře, meteorologie
Impakt faktor: 3.021, rok: 2011
http://www.agu.org/pubs/crossref/2011/2010JA016235.shtml

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.
Trvalý link: http://hdl.handle.net/11104/0201436