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Thermospheric up-welling in the cusp region, evidence from CHAMP observations

Authors
/persons/resource/hluehr

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

/persons/resource/rother

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

/persons/resource/wolfk

Köhler,  Wolfgang
Deutsches GeoForschungsZentrum;

/persons/resource/pritter

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

/persons/resource/grun

Grunwaldt,  Ludwig
1.2 Global Geomonitoring and Gravity Field, 1.0 Geodesy and Remote Sensing, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Lühr, H., Rother, M., Köhler, W., Ritter, P., Grunwaldt, L. (2004): Thermospheric up-welling in the cusp region, evidence from CHAMP observations. - Geophysical Research Letters, 31, L06805.
https://doi.org/10.1029/2003GL019314


https://gfzpublic.gfz-potsdam.de/pubman/item/item_235028
Abstract
The satellite CHAMP with its sensitive accelerometer on board provides the opportunity to investigate the thermospheric dynamics in great detail. In this study we concentrate on density structures in the cusp. During 25 Sep. 2000, the day we take as an example, air density enhancements of almost a factor of two are observed whenever the satellite passes the cusp region. For the interpretation of these events we consider also the concurrent ionospheric Hall and field-aligned currents (FACs). As expected, sizable currents are found in the regions of dense air. Small-scale FAC filaments (1-km size) seem to play an important role in the heating. Whenever these very intense FACs with amplitudes of several hundreds of μA/m2 show up, density enhancements occur.