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| Titel |
Radial diffusion modeling with empirical lifetimes: comparison with CRRES observations |
| VerfasserIn |
Y. Y. Shprits, R. M. Thorne, G. D. Reeves, R. Friedel |
| 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 ; 23, no. 4 ; Nr. 23, no. 4 (2005-06-03), S.1467-1471 |
| Datensatznummer |
250015236
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| Publikation (Nr.) |
 copernicus.org/angeo-23-1467-2005.pdf |
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| Zusammenfassung |
| A time dependent radial diffusion model is used to quantify the competing
effects of inward radial diffusion and losses on the distribution of the
outer zone relativistic electrons. The rate of radial diffusion is
parameterized by Kp with the loss time as an adjustable parameter. Comparison
with HEEF data taken over 500 Combined Release and Radiation Effects Satellite (CRRES) orbits indicates that 1-MeV electron
lifetimes near the peak of the outer zone are less than a day during the
storm main phase and few days under less disturbed conditions. These values
are comparable to independent estimates of the storm time loss rate due to
scattering by EMIC waves and chorus emission, and also provide an acceptable
representation of electron decay rates following the storm time injection.
Although our radial diffusion model, with data derived lifetimes, is able to
simulate many features of the variability of outer zone fluxes and predicts
fluxes within one order of magnitude accuracy for most of the storms and L values,
it fails to reproduce the magnitude of flux changes and the gradual build up
of fluxes observed during the recovery phase of many storms. To address
these differences future modeling should include an additional local
acceleration source and also attempt to simulate the pronounced loss of
electrons during the main phase of certain storms. |
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