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| Titel |
Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU |
| VerfasserIn |
T. Xiao, Q. Q. Shi, T. L. Zhang, S. Y. Fu, L. Li, Q. G. Zong, Z. Y. Pu, L. Xie, W. J. Sun, Z. X. Liu, E. Lucek, H. Rème |
| 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 ; 28, no. 9 ; Nr. 28, no. 9 (2010-09-20), S.1695-1702 |
| Datensatznummer |
250016882
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| Publikation (Nr.) |
 copernicus.org/angeo-28-1695-2010.pdf |
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| Zusammenfassung |
| Interplanetary linear magnetic holes (LMHs) are structures in which the
magnetic field magnitude decreases with little change in the field direction.
They are a 10–30% subset of all interplanetary magnetic holes (MHs). Using
magnetic field and plasma measurements obtained by Cluster-C1, we
surveyed the LMHs in the solar wind at 1 AU. In total 567 interplanetary
LMHs are identified from the magnetic field data when Cluster-C1 was
in the solar wind from 2001 to 2004. We studied the relationship between the
durations and the magnetic field orientations, as well as that of the scales
and the field orientations of LMHs in the solar wind. It is found that the
geometrical structure of the LMHs in the solar wind at 1 AU is consistent
with rotational ellipsoid and the ratio of scales along and across the
magnetic field is about 1.93:1. In other words, the structure is elongated
along the magnetic field at 1 AU. The occurrence rate of LMHs in the solar
wind at 1 AU is about 3.7 per day. It is shown that not only the occurrence
rate but also the geometrical shape of interplanetary LMHs has no significant
change from 0.72 AU to 1 AU in comparison with previous studies. It is thus
inferred that most of interplanetary LMHs observed at 1 AU are formed and
fully developed before 0.72 AU. The present results help us to study the
formation mechanism of the LMHs in the solar wind. |
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