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| Titel |
Stormtime dynamics of the global thermosphere and equatorial ionosphere |
| VerfasserIn |
W. J. Burke, C. Y. Huang, R. D. Sharma |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 5 ; Nr. 27, no. 5 (2009-05-05), S.2035-2044 |
| Datensatznummer |
250016522
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| Publikation (Nr.) |
 copernicus.org/angeo-27-2035-2009.pdf |
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| Zusammenfassung |
| During magnetic storms the development of equatorial
plasma bubbles (EPBs) and distributions of thermospheric densities are
strongly influenced by the histories of imposed magnetospheric electric
(εM) fields. Periods of intense EPB activity driven by
penetration εM fields in the main phase are followed by
their worldwide absence during recovery. A new method is applied to estimate
global thermospheric energy (Eth) budgets from orbit-averaged densities
measured by accelerometers on polar-orbiting satellites. During the main
phase of storms Eth increases as long as the stormtime εM operates, then exponentially decays toward quiet-time values during
early recovery. Some fraction of the energy deposited at high magnetic
latitudes during the main phase propagates into the subauroral
ionosphere-thermosphere where it affects chemical and azimuthal-wind
dynamics well into recovery. We suggest a scenario wherein fossils of main
phase activity inhibit full restoration of quiet-time dayside dynamos and
pre-reversal enhancements of upward plasma drifts near dusk denying
bottomside irregularities sufficient time to grow into EPBs. |
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