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| Titel |
Energetic particles observed by ISEE-1 and ISEE-2 in a cusp diamagnetic cavity on 29 September 1978 |
| VerfasserIn |
B. M. Walsh, T. A. Fritz, N. M. Lender, J. Chen, K. E. Whitaker |
| 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 ; 25, no. 12 ; Nr. 25, no. 12 (2008-01-02), S.2633-2640 |
| Datensatznummer |
250015969
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| Publikation (Nr.) |
 copernicus.org/angeo-25-2633-2007.pdf |
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| Zusammenfassung |
| Observations by the ISEE-1 and ISEE-2 spacecraft on 29 September 1978 show
large CEP (Cusp Energetic Particle) fluxes while passing through the dayside
magnetospheric cusp in near coincident orbits. The event was observed around
11:00 MLT between roughly 12:30 and 13:00 UT by ISEE-1 and 12:00 and 13:00 UT by
ISEE-2. During these periods, both electron and ion fluxes increased by more
than two orders of magnitude, with the electron flux showing a strong peak at
a pitch angle of 90°. The solar wind was ~710 km s−1 and
the Dst was ~−200 nT, suggesting the occurrence of a strong
geomagnetic storm. The ISEE-1 and ISEE-2 observations, however, show no
time-energy dispersion of the CEPs, leading us to believe that these
particles could not be the result of substorm processes in the magnetotail.
The local magnetic field was depressed and extremely turbulent. Changes in
the magnitude of the magnetic field anticorrelate closely to variations of
the electron flux. The observations in electron flux peaking at 90°
and the close anticorrelation between the local magnetic field strength and
electron flux are unique and provide evidence of a potential local source for
these energetic particles. |
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