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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 25, issue 7
Ann. Geophys., 25, 1543–1554, 2007
https://doi.org/10.5194/angeo-25-1543-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 25, 1543–1554, 2007
https://doi.org/10.5194/angeo-25-1543-2007
© Author(s) 2007. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Jul 2007

30 Jul 2007

Magnetic perturbations seen by CHAMP and evaluated using the TIE-GCM

D. T. Mozzoni1,2, M. Mandea1, and J. Cain3 D. T. Mozzoni et al.
  • 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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