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| Titel |
Mirror mode structures near Venus and Comet P/Halley |
| VerfasserIn |
D. Schmid, M. Volwerk, F. Plaschke, Z. Vörös, T. L. Zhang, W. Baumjohann, Y. Narita |
| 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. 6 ; Nr. 32, no. 6 (2014-06-17), S.651-657 |
| Datensatznummer |
250121071
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| Publikation (Nr.) |
 copernicus.org/angeo-32-651-2014.pdf |
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| Zusammenfassung |
| In this paper, we study where mirror mode structures are generated near
unmagnetized solar system bodies (Venus and comet P/Halley measured in situ
by Venus Express and Giotto). To estimate the location of the mirror mode
source region at Venus, we apply a turbulent diffusion model of mirror mode
structures, which has already been successfully tested in planetary
magnetosheaths (Earth, Jupiter, Saturn). It enables us to estimate the
distance between the measured location of the mirror mode and the origin of
the mirror mode structure through the mirror mode size. We find that the
scenario of mirror mode excitation at the bow shock with subsequent
convection and diffusion downstream to the magnetopause is valid for Venus.
In the cometary case, however, we find that the size of the mirror mode
structure is comparable to the gyroradius of water group ions. This suggests
local production of mirror mode structures in the cometary magnetosheath,
most likely through fresh ion pickup, as opposed to the convection and
diffusion mechanism at Venus. |
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