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| Titel |
Evaluation of energetic particle parameters in the near-Earth magnetotail derived from flux asymmetry observations |
| VerfasserIn |
Z. Y. Pu, R. H. W. Friedel, A. Korth, Q. G. Zong, Z. X. Chen, A. Roux, S. Perraut |
| 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 ; 16, no. 3 ; Nr. 16, no. 3, S.283-291 |
| Datensatznummer |
250013195
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| Publikation (Nr.) |
 copernicus.org/angeo-16-283-1998.pdf |
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| Zusammenfassung |
The flux asymmetries measured by
spectrometers on board spacecraft contain information on particle parameters.
The net flux intensity (NFI) method provides a tool to evaluate these
parameters. The NFI method is valid when both the spin period of the spacecraft
and the time resolution of the particle spectrometers are much shorter than the
characteristic time-scale of the particle flux variations. We apply the NFI
analysis to the flux asymmetry measurements made by GEOS 2 at the nightside
geosynchronous orbit in the late substorm growth phase. The cross-tail current
of energetic ions, their pressure gradient and average drift velocity, as well
as a field-aligned flows are investigated. Current disruption at substorm onset
and the "convection surge" mechanism during dipolarization of the
magnetic field are directly observed.
Key words. Flux asymmetry · Net flux intensity · GEOS
2 · Energetic particles |
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