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Article Dans Une Revue Advances in Space Research Année : 2010

Comparison of the observed and modeled low- to mid-latitude thermosphere response to magnetic activity: Effects of solar cycle and disturbance time delay

Résumé

The performance of JB2008 and NRLMSISE-00 models, in describing the response of the thermosphere to magnetic activity are evaluated against total mass density retrieved from accelerometer measurements made onboard CHAMP satellite during 5 years. We show that the global low to mid-latitude disturbance amplitude is correctly described by the JB2008 model for low solar activity conditions and by both the JB2008 and the NRLMSISE-00 models for high solar activity conditions. For low solar activity conditions, statistics based on almost 3 years of data confirm the large underestimation by the NRLMSISE-00 model quantified by Lathuillère et al. (2008) for the year 2004. We also found that the time delay between low to mid-latitude global thermosphere disturbance and magnetic activity is statistically well estimated by the NRLMSISE-00 and JB2008 models for disturbed conditions. For moderately disturbed conditions however, the time delay estimated by the JB2008 model is too large by about 3 hours. For very disturbed conditions, we found different time delays during day time and night time, using new geomagnetic proxies with a 30 min. time resolution.

Dates et versions

hal-00410672 , version 1 (23-08-2009)

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Chantal Lathuillère, Michel Menvielle. Comparison of the observed and modeled low- to mid-latitude thermosphere response to magnetic activity: Effects of solar cycle and disturbance time delay. Advances in Space Research, 2010, 45 (9), pp.1093-1100. ⟨10.1016/j.asr.2009.08.016⟩. ⟨hal-00410672⟩
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