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| Titel |
Global Pc5 pulsations during strong magnetic storms: excitation mechanisms and equatorward expansion |
| VerfasserIn |
J. Marin, V. Pilipenko, O. Kozyreva, M. Stepanova, M. Engebretson, P. Vega, E. Zesta |
| 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 ; 32, no. 4 ; Nr. 32, no. 4 (2014-04-08), S.319-331 |
| Datensatznummer |
250121044
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| Publikation (Nr.) |
 copernicus.org/angeo-32-319-2014.pdf |
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| Zusammenfassung |
| The dynamics of global Pc5 waves during the magnetic storms on 29–31 October 2003
are considered using data from the trans-American and trans-Scandinavian
networks of magnetometers in the morning and post-noon magnetic local time (MLT) sectors. We study
the latitudinal distribution of Pc5 wave spectral characteristics to
determine how deep into the magnetosphere these Pc5 waves can extend at
different flanks of the magnetosphere. The wave energy transmission
mechanisms are different during 29–30 October and 31 October wave events. Further,
we examine whether the self-excited Kelvin–Helmholtz instability is sufficient as an
excitation mechanism for the global Pc5 waves. We suggest that on 31 October a
magnetospheric magnetohydrodynamic (MHD) waveguide was excited, and the rigid regime of its
excitation was triggered by enhancements of the solar wind density. The
described features of Pc5 wave activity during recovery phase of strong
magnetic storm are to be taken into account during the modeling of the
relativistic electron energization by ultra-low-frequency (ULF) waves. |
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