HR: 0830h
AN: GP21A-0032    [PDF]
TI: Comparing an Empirical Model of the Equatorial Electrojet with CHAMP Satellite Magnetic Measurements
AU: * Cohen, Y
EM: cohen@ipgp.jussieu.fr
AF: IPGP, 4 av. de Neptune, St. Maur, 94107 France
AU: Doumouya, V
EM: doumouya@ipgp.jussieu.fr
AF: Universite de Cocody, B.P. 582 Abidjan 22, Abidjan, 22 Cote D'ivoire
AB: The longitudinal variation of the EEJ intensity has been reworded, including further ground stations, particularly Baclieu (Vietnam), where an unexpected enhancement is observed. The structure of the ground based longitudinal profile around noon was compared and found to be in good agreement with that obtained from CHAMP data. Confirming the particular behavior of the ionosphere above eastern Asia. The Equatorial Electrojet (EEJ) signatures recorded on board CHAMP satellite have been isolated for 13 passes closely above the west African chain of three stations aimed to accompany Oersted and CHAMP satellite missions, as well as for 19 other passes in three different longitude bands of 15$\deg$.The resulted CHAMP EEJ signatures have been compared with the computed EEJ magnetic effects derived from this empirical model of the EEJ, which includes local time and longitude dependences. The model predicted magnetic variations at CHAMP orbit are generally in good agreement with the onboard magnetic signatures. Differences between computed and measured DF peak values are most of the time (69%) less than 10nT. This model will be used to isolate the ionospheric contribution to the Earth internal magnetic field measured by satellite.
DE: 1555 Time variations--diurnal to secular
SC: Geomagnetism and Paleomagnetism [GP]
MN: 2003 Fall Meeting