Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU
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 surve...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2010-09-01
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| Series: | Annales Geophysicae |
| Online Access: | https://www.ann-geophys.net/28/1695/2010/angeo-28-1695-2010.pdf |
| _version_ | 1818134499632873472 |
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| author | T. Xiao T. Xiao Q. Q. Shi 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. Reme H. Reme |
| author_facet | T. Xiao T. Xiao Q. Q. Shi 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. Reme H. Reme |
| author_sort | T. Xiao |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-11T09:09:36Z |
| format | Article |
| id | doaj.art-e250423b75934da492cf19274ccadc2b |
| institution | Directory Open Access Journal |
| issn | 0992-7689 1432-0576 |
| language | English |
| last_indexed | 2024-12-11T09:09:36Z |
| publishDate | 2010-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Annales Geophysicae |
| spelling | doaj.art-e250423b75934da492cf19274ccadc2b2022-12-22T01:13:33ZengCopernicus PublicationsAnnales Geophysicae0992-76891432-05762010-09-01281695170210.5194/angeo-28-1695-2010Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AUT. Xiao0T. Xiao1Q. Q. Shi2Q. Q. Shi3T. L. Zhang4S. Y. Fu5L. Li6Q. G. Zong7Z. Y. Pu8L. Xie9W. J. Sun10Z. X. Liu11E. Lucek12H. Reme13H. Reme14State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, ChinaSchool of Space Science and Physics, Shandong University at Weihai, Weihai, ChinaInstitute of Space Physics and Applied Technology, Peking University, Beijing, ChinaSchool of Space Science and Physics, Shandong University at Weihai, Weihai, ChinaSpace Research Institute, Austrian Academy of Sciences, 8042 Graz, AustriaInstitute of Space Physics and Applied Technology, Peking University, Beijing, ChinaSchool of Space Science and Physics, Shandong University at Weihai, Weihai, ChinaInstitute of Space Physics and Applied Technology, Peking University, Beijing, ChinaInstitute of Space Physics and Applied Technology, Peking University, Beijing, ChinaInstitute of Space Physics and Applied Technology, Peking University, Beijing, ChinaSchool of Space Science and Physics, Shandong University at Weihai, Weihai, ChinaState Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, ChinaSpace and Atmospheric Physics Group, Blackett Laboratory, Imperial College, London, UKCESR, UPS, University of Toulouse, Toulouse, FranceUMR 5187, CNRS, Toulouse, FranceInterplanetary 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.https://www.ann-geophys.net/28/1695/2010/angeo-28-1695-2010.pdf |
| spellingShingle | T. Xiao T. Xiao Q. Q. Shi 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. Reme H. Reme Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU Annales Geophysicae |
| title | Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU |
| title_full | Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU |
| title_fullStr | Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU |
| title_full_unstemmed | Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU |
| title_short | Cluster-C1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 AU |
| title_sort | cluster c1 observations on the geometrical structure of linear magnetic holes in the solar wind at 1 au |
| url | https://www.ann-geophys.net/28/1695/2010/angeo-28-1695-2010.pdf |
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