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A statistical study of the observed and modeled global thermosphere response to magnetic activity

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Abstract

Total density retrieved from CHAMP/STAR accelerometer measurements from years 2002 to 2005 is compared to the NRLMSISE00 and JB2006 model predictions. Special emphasis is put on the low and mid latitude global response of the thermosphere to the varying geomagnetic forcing. CHAMP densities are used to define a disturbance coefficient that characterizes this response. We show that this disturbance coefficient is better correlated with the magnetic am indices than with the magnetic ap indices used in the models for quantifying the geomagnetic forcing. It is found that the NRLMISISE-00 model correctly estimates the main features of the thermosphere density response to geomagnetic activity, i.e. the morphology of UT variations and the larger increases during night than during day-time. However it statistically underestimates the amplitude of the density response by about 45 %. Similar comparison with JB2006 will also be shown.
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Dates and versions

insu-00361538 , version 1 (16-02-2009)

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  • HAL Id : insu-00361538 , version 1

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Chantal Lathuillere, Michel Menvielle, Aurelie Marchaudon. A statistical study of the observed and modeled global thermosphere response to magnetic activity. 37th COSPAR Scientific Assembly, Jul 2008, Montréal, Canada. ⟨insu-00361538⟩
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