Počet záznamů: 1

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

  1. 1.
    0366447 - UFA-U 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