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| Titel |
Investigating radiation belt losses though numerical modelling of precipitating fluxes |
| VerfasserIn |
C. J. Rodger, D. Nunn, M. A. Clilverd |
| 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 ; 22, no. 10 ; Nr. 22, no. 10 (2004-11-03), S.3657-3667 |
| Datensatznummer |
250015038
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| Publikation (Nr.) |
 copernicus.org/angeo-22-3657-2004.pdf |
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| Zusammenfassung |
| It has been suggested that whistler-induced electron
precipitation (WEP) may be the most significant inner radiation belt loss
process for some electron energy ranges. One area of uncertainty lies in
identifying a typical estimate of the precipitating fluxes from the examples
given in the literature to date. Here we aim to solve this difficulty
through modelling satellite and ground-based observations of onset and decay
of the precipitation and its effects in the ionosphere by examining
WEP-produced Trimpi perturbations in subionospheric VLF transmissions. In
this study we find that typical Trimpi are well described by the effects of
WEP spectra derived from the AE-5 inner radiation belt model for typical
precipitating energy fluxes. This confirms the validity of the radiation
belt lifetimes determined in previous studies using these flux parameters.
We find that the large variation in observed Trimpi perturbation size
occurring over time scales of minutes to hours is primarily due to differing
precipitation flux levels rather than changing WEP spectra. Finally, we show
that high-time resolution measurements during the onset of Trimpi
perturbations should provide a useful signature for discriminating WEP
Trimpi from non-WEP Trimpi, due to the pulsed nature of the WEP arrival. |
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