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| Titel |
On the role of collective interactions in asymmetric ring current formation |
| VerfasserIn |
P. A. Bespalov, A. G. Demekhov, A. Grafe, V. Yu. Trakhtengerts |
| 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 ; 12, no. 5 ; Nr. 12, no. 5, S.422-430 |
| Datensatznummer |
250010789
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| Publikation (Nr.) |
 copernicus.org/angeo-12-422-1994.pdf |
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| Zusammenfassung |
| The contribution of resonant wave-particle
interactions to the formation and decay of the magnetospheric ring current is
analysed in the framework of a self-consistent set of equations which take into
account azimuthal plasmasphere asymmetry. It is shown that the cyclotron
interaction of westward drifting energetic protons with Alfven waves in the
evening-side plasmaspheric bulge region leads to the formation of a ring current
asymmetry located near 18:00 MLT. The time-scale of this asymmetry is determined
by the proton drift time through the plasmaspheric bulge and is about 1 - 3 h. A
symmetrical ring current decays mainly due to charge exchange processes. The
theory is compared with known experimental data on ions and waves in the ring
current and on low-latitude magnetic disturbances. New low-latitude magnetometer
data on the magnetic storm of 24 - 26 July 1986 are also discussed. The model
presented explains the observed localization of an asymmetrical ring current
loop in the evening sector and the difference in relaxation time-scales of the
asymmetry and the Dst index. It also explains measured wave
turbulence levels in the evening-side plasmasphere and wave observation
statistics. |
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