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Climatological features of the ionosphere as derived from CHAMP observations and from IRI predictions

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Stolle,  Claudia
2.3 Earth's Magnetic Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Liu,  H.
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Förster,  Matthias
2.3 Earth's Magnetic Field, 2.0 Physics of the Earth, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Zitation

Stolle, C., Liu, H., Förster, M. (2008): Climatological features of the ionosphere as derived from CHAMP observations and from IRI predictions, 37th COSPAR Scientific Assembly (Montreal 2008) (Montreal, Canada).


https://gfzpublic.gfz-potsdam.de/pubman/item/item_237469
Zusammenfassung
The CHAMP mission supplies us with a multi-year database of ionospheric measurements distributed globally over all local times. This provides special opportunity to investigate climatological features of the ionosphere and to compare these results with predictions of sophisticated empirical models as, e.g., those of the International Reference Ionosphere (IRI). IRI estimates are successfully used in many scientific and application studies. Frequently comparisons and updates with new data are steadily enhancing the model's quality. We have employed 6 years (between 1 August 2000 and 1 August 2006) of in situ electron density readings on board the CHAMP satellite to compile ionospheric maps for low latitudes and at an altitude of 400 km. By that we have investigated the solar activity dependence of electron density and found significant variations with local time, latitude, and season. We revealed a strong intensification of the Equatorial Ionization Anomaly (EIA) with increasing solar activity in the post-sunset sector, but we observed only moderate variations during noontime. In addition, the crest regions are generally more sensitive to solar activity than the equatorial trough, and the crest's variation is seasonal dependent. The IRI model reproduces very well the distribution of electron density at 400 km during noontime for all solar activity levels. However, significant deficits are observed for the post sunset sector where the EIA strength is often largely underestimated. We believe that the major cause for this underestimation is the unsatisfactory model representation of the equatorial F-layer height while the IRIu2019s lack of equatorial instabilities does not seem to disturb the comparison between data and model.