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| Titel |
Nonstationary pearl pulsations as a signature of magnetospheric disturbances |
| VerfasserIn |
F. Z. Feygin, N. G. Kleimenova, O. A. Pokhotelov, M. Parrot, K. Prikner, K. Mursula, J. Kangas, T. Pikkarainen |
| 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 ; 18, no. 5 ; Nr. 18, no. 5, S.517-522 |
| Datensatznummer |
250013985
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| Publikation (Nr.) |
 copernicus.org/angeo-18-517-2000.pdf |
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| Zusammenfassung |
We analyse long-lasting (several hours) Pc1
pearl pulsations with decreasing, increasing or constant central frequencies. We
show that nonstationary pearl events (those with either decreasing or increasing
central frequency) are observed simultaneously with increasing auroral magnetic
activity at the nightside magnetosphere while the stationary events (constant
central frequency) correspond to quiet magnetic conditions. Events with
decreasing central frequency are observed mostly in the late morning and daytime
whereas events with increasing central frequency appear either early in the
morning or in the afternoon. We explain the diurnal distribution of the
nonstationary pearl pulsations in terms of proton drifts depending on magnetic
activity, and evaluate the magnetospheric electric field based on the variation
of the central frequency of pearl pulsations.
Key words: Magnetospheric physics (magnetospheric
configuration and dynamics; plasma waves and instabilities) |
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