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Spatial structures of magnetic depression in the Earth's high-altitude cusp: Cluster multipoint observations
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SYSNO ASEP 0333417 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Spatial structures of magnetic depression in the Earth's high-altitude cusp: Cluster multipoint observations Title Prostorová struktura magnetických děr ve vzdáleném zemském cuspu: vícebodová pozorování družic Cluster Author(s) Shi, Q. Q. (CN)
Pu, Z. Y. (CN)
Souček, Jan (UFA-U) RID, ORCID
Zong, Q. -G. (CN)
Fu, S. Y. (CN)
Xie, L. (CN)
Chen, Y. (CN)
Zhang, H. (US)
Li, L. (CN)
Xia, L. D. (CN)
Liu, Z. X. (CN)
Lucek, E. (GB)
Fazakerley, A. N. (GB)
Reme, H. (FR)Source Title Journal of Geophysical Research - ISSN 0148-0227
Roč. 114, - (2009), A10202/1-A10202/13Number of pages 13 s. Language eng - English Country US - United States Keywords high-altitude cusp ; mirror modes ; magnetic holes ; multi-spacecraft methods Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects IAA301120601 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) UT WOS 000270707200001 DOI 10.1029/2009JA014283 Annotation Magnetic depression structures (magnetic holes) of short time duration from seconds to minutes have been studied using Cluster data in the high-latitude cusp. Our analysis revealed that the magnetic depressions are spatial structures traveling across the spacecraft. We show that multiple properties of the magnetic depressions are consistent with those of mirror structures observed in the magnetosheath or solar wind. The plasma in the cusp is rarely unstable with respect to mirror instability. However, as has been shown by previous studies, once a large magnetic hole is created by mirror instability, it becomes relatively stable and can survive for extended periods of time even if surrounding plasma conditions drop well below the mirror threshold. Specifically, the magnetic holes could be generated in the magnetosheath and enter the cusp due to the open geometry of the cusp magnetic field. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2010
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