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| Titel |
Multiple discrete-energy ion features in the inner magnetosphere: 9 February 1998, event |
| VerfasserIn |
Y. Ebihara, M. Ejiri, H. Nilsson, I. Sandahl, M. Grandé, J. F. Fennell, J. L. Roeder, D. R. Weimer, T. A. Fritz |
| 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. 4 ; Nr. 22, no. 4 (2004-04-02), S.1297-1304 |
| Datensatznummer |
250014839
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| Publikation (Nr.) |
 copernicus.org/angeo-22-1297-2004.pdf |
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| Zusammenfassung |
Multiple discrete-energy ion bands
observed by the Polar satellite in the inner magnetosphere
on 9 February 1998
were investigated by means of particle simulation
with a realistic model of the convection electric field.
The multiple bands appeared in the energy vs. L spectrum
in the 1–100 keV range when Polar traveled
in the heart of the ring current
along the outbound and inbound paths.
We performed particle tracing, and simulated the energy vs. L spectra
of proton fluxes under the dipole magnetic field,
the corotation electric field,
and the realistic convection electric
field model with its parameters depending on the solar wind data.
Simulated spectra are shown to
agree well with the observed ones.
A better agreement is achieved when
we rotate the convection electric potential eastward by 2h inMLT
and we change the distribution function in time in the near-Earth magnetotail.
It is concluded that the multiple bands are likely produced
by two processes
for this particular event, that is,
changes in the convection electric field (for >3keV protons)
and changes in the distribution function in the near-Earth magnetotail (for <3keV protons).
Key words. Magnetospheric physics (energetic particles,
trapped; electric field) – Space plasma physics (numerical
simulation studies) |
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