Issue |
J. Space Weather Space Clim.
Volume 14, 2024
|
|
---|---|---|
Article Number | 28 | |
Number of page(s) | 11 | |
DOI | https://doi.org/10.1051/swsc/2024027 | |
Published online | 23 October 2024 |
Technical Article
Thermosphere model assessment for geomagnetic storms from 2001 to 2023
GET-CNES, Space Geodesy Office, 14 Av. Edouard Belin, 31400 Toulouse, France
* Corresponding author: sean.bruinsma@cnes.fr
Received:
29
April
2024
Accepted:
14
August
2024
We present an updated study for thermosphere model assessment under geomagnetic storm conditions, defined when the geomagnetic index ap = 80 or larger. Comparisons between five empirical models, NRLMSISE-00, JB2008, and three versions of DTM2020, and CHAMP, GRACE, GOCE, Swarm-A, and GRACE-FO neutral density data sets for 152 storms are presented. The storms are categorized according to ap, as single peak or multiple peaks. After applying a model debiasing procedure using the density data just before the onset of a storm, the models are on average only slightly biased, often only a few percent. This is an unexpected and reassuring result for these relatively simple models, which were fitted to different observations. The standard deviations of these averages are however up to 12% (1-sigma), which places the small biases into perspective. The smallest biases are achieved at the lowest altitude when comparing with GOCE data, and the highest for GRACE. The best results, i.e. smallest bias and standard deviation on average over all single-peak storms, over the entire 4-Phase storm period are obtained with DTM2020_Intermediate and DTM2020_Research models, while the oldest model, NRLMSISE-00, is the least precise. However, NRLMSISE-00 is the least biased when compared to multiple-peak storms. As could be expected, multiple-peak storms are reproduced with less precision than single-peak storms. The assessment reveals that model precision decreases with altitude, but that bias is independent of altitude, at least in the range covered by the data, 250–550 km.
Key words: Thermosphere / Model assessment / Geomagnetic storm / Satellite drag
© S. Bruinsma & S. Laurens, Published by EDP Sciences 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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