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| Titel |
Definition of new geomagnetic activity proxies and their use in thermosphere density modeling in the framework of the ATMOP project (invited) |
| VerfasserIn |
Farida El-Lemdani Mazouz, Michel Menvielle, Chantal Lathuillère, Aurélie Marchaudon, Aude Chamboudout, Sean Bruinsma |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250080171
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| Zusammenfassung |
| In the framework of the FP7 European program ATMOP (Advanced Thermosphere
Modelling for Orbit Prediction), we present a test of new geomagnetic indices, that we
propose to use in the new version of the semi empirical DTM thermosphere model.
This new version of the DTM model will provide in quasi real time a precise air
drag computation, necessary for accurate tracking of space objects in low earth
orbit.
To characterize the geomagnetic forcing in the upper atmosphere geomagnetic indices
derived from ground based magnetic variation recordings are used. In the currently used
semi-empirical density models (DTM, MSIS, JB2008) the geomagnetic forcing is
characterized using the Km or Kp index with a 3 hour time resolution or the DST index with
a 1 hour time resolution.
We define new geomagnetic indices, based on ground based magnetic variations
recorded in the am network observatories at sub-auroral latitudes to achieve a better
temporal resolution (αm indices) or a better spatial representation of the local time
dependency of the solar wind/magnetosphere interaction (am-MLT and αm-MLT sector
indices).
This test will be carried out using CHAMP and GRACE densities (inferred from
accelerometer data in the 370-490 km range) between years 2002-2006.
Correlations between the variation of density and geomagnetic indices will give
information on the geomagnetic indices to be used, taking into account constraints for an
operational version of the DTM model. |
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