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Ann. Geophys., 25, 1543-1554, 2007
www.ann-geophys.net/25/1543/2007/
© European Geosciences Union 2007
Magnetic perturbations seen by CHAMP and evaluated using the TIE-GCM
D. T. Mozzoni1,2, M. Mandea1, and J. Cain3
1GeoForschungsZentrum Potsdam, Telegrafenberg, 14473 Potsdam, Germany
2Florida State University, Department of Physics, Tallahassee, FL 32312, USA
3Florida State University, Geophysical Fluid Dynamics Institute, Tallahassee, FL 32312, USA
Abstract. The Thermosphere-Ionosphere Electrodynamics General Circulation Model
(TIE-GCM) is a self-consistent, global, atmospheric model that can be used
to estimate magnetic perturbations at satellite altitude. These computed
perturbations can then be compared with the magnetic vector data provided by
low-earth orbiting satellites. In this initial study, the quietest day of
each month from 2001–2005 was selected for comparison. CHAMP magnetic
vector residuals were computed for these intervals using the CHAOS model to remove core and crustal
geomagnetic contributions. Under various input
parameters, the TIE-GCM predictions were compared with the CHAMP residuals
on an orbit by orbit basis. Initial results demonstrate a reasonable
agreement between the TIE-GCM estimates and the CHAMP residuals in
non-polar, dayside regions (±50° magnetic latitude) where both
are able to resolve the Equatorial Electro-Jet (EEJ) and solar quiet (Sq)
current systems. Although no clear component or temporal correlation was
discerned, evidence showing the decrease in residual comparisons presents the
possibility of using the TIE-GCM to pre-process geomagnetic data for main
field modeling purposes.
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