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| Titel |
Modelling of mirror mode structures as propagating slow magnetosonic solitons |
| VerfasserIn |
K. Stasiewicz, C. Z. Cheng |
| 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 ; 27, no. 12 ; Nr. 27, no. 12 (2009-12-02), S.4379-4389 |
| Datensatznummer |
250016718
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4379-2009.pdf |
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| Zusammenfassung |
| Cluster measurements in the magnetosheath with spacecraft separations of 2000 km
indicate that magnetic pulsations interpreted as mirror mode structures
are not frozen in plasma flow, but do propagate with speeds of up to ~50 km/s.
Properties of these pulsations are shown to be consistent with
propagating slow magnetosonic solitons. By using nonlinear two fluid theory
we demonstrate that the well known classical mirror instability condition
corresponds to a small subset in a continuum of exponentially varying
solutions. With the measured plasma moments we have determined parameters of
the polybaric pressure model in the region of occurrence of mirror type
structures and applied it to numerical modelling of these structures. In
individual cases we obtain excellent agreement between observed mirror mode
structures and numerical solutions for magnetosonic solitons. |
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