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| Titel |
Dust dynamic pressure and magnetopause displacement: reasons for non-detection |
| VerfasserIn |
I. Mann, M. Hamrin |
| 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 ; 31, no. 1 ; Nr. 31, no. 1 (2013-01-07), S.39-44 |
| Datensatznummer |
250017316
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| Publikation (Nr.) |
 copernicus.org/angeo-31-39-2013.pdf |
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| Zusammenfassung |
| In a recent paper, Treumann and Baumjohann
(2011) propose that
the contribution of dust particles
to the solar wind dynamic pressure can cause large
compressions of the Earth's magnetopause and suggest that this
occurs when Earth encounters meteoroid streams. In this paper we
estimate the contribution from charged dust particles to the solar
wind dynamical pressure, and we exclude that the dust associated to
meteoroid streams can influence the extension of the magnetopause
according to the proposed model. A sufficient
coupling to the solar wind is only expected for so-called
nanodust. However, the dynamic pressure of the nanodust is orders
of magnitudes below that of the solar wind, making it unlikely that
its variation can be observed in displacements of
the magnetopause. We also discuss the equation that the authors
use for estimating the extension of the Earth's magnetopause, and
conclude that this is not applicable due to the large gyroradius
of the nanodust. We finally note that an influence of dust on the
extension of a magnetosphere might be quite possible in other
astrophysical systems and based on other processes. |
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