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Propagation of interplanetary shock excited ultra low frequency (ULF) waves in magnetosphere-ionosphere-atmosphere——Multi-spacecraft “Cluster” and ground-based magnetometer observations

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Science China(Technological Sciences) 2010年第9期53卷 2528-2534页

作者： WANG ChengRui1,2,ZONG QiuGang1,3 & WANG YongFu1 1 Institute of Space Physics and Applied Technology,Peking university,Beijing 100871,China 2 Sate Key Laboratory of Space Weather,Chinese Academy of Sciences,Beijing 100190,China 3 center for atmospheric research,600 suffolk street,university of massachusetts lowell,ma 01854,usa Institute of Space Physics and Applied Technology Peking University Sate Key Laboratory of Space Weather Chinese Academy of Sciences center for atmospheric research 00 Suffolk Street University of Massachusetts Lowell

The ultra low frequency (ULF) wave in magnetosphere can act as an important means for solar wind energy inward *** paper quantitatively analyzes the propagation process of the ULF wave triggered by the interplanetary shock propagating from inner magnetosphere equatorial plane along magnetic field lines to the top of the ionosphere and below ionosphere propagating process and establishes a relatively complete magnetosphere-ionosphere-atmosphere propagation model which can be used to study the relationship between the amplitude of the ULF waves triggered by the interplanetary shock wave in magnetospheric space and the magnetic effect caused by the ULF *** a comparison with recent observations,we found that: in the event during November 7,2004 that an interplanetary shock wave interacted with the magnetosphere,Cluster satellites observed that electric field fluctuations and the band-pass filtered result of ground stations meridional component had similar *** with the geomagnetic measurement near the footprints,we found that the electric field disturbance in the magnetosphere spread along the ground magnetic field lines in the form of the ULF waves and changed into geomagnetic *** result reveals that the ULF wave is in contact with the ground geomagnetic *** ULF waves couple with ionized components in ionosphere and spread to the ground in the form of electromagnetic *** this research,we believe that the magnetosphere,ionosphere and ground magnetic effects caused by interplanetary shock wave are the same physical phenomena responding in different *** on the overall consideration of entire electromagnetic response to the interplanetary shock wave,we found that the correlation between CLUSTER multi-satellite observation and geomagnetic station observation is due to the ULF wave propagated in magnetosphere-ionosphere-atmosphere system,and we quantitatively interpreted this response process

关键词： ultra low frequency (ULF) wave magnetic storm ionosphere IRI model interplanetary shock

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Low-frequency fluctuations in the magnetosheath: Double Star TC-1 and Cluster observations

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Science China(Technological Sciences) 2008年第10期51卷 1626-1638页

作者： DU Jian1,2 WANG Chi1, SONG Pu3,4 & ZHANG TieLong5 1 State Key Laboratory of Space Weather, center for Space Science and Applied research, Chinese Academy of Sciences, Beijing 100190, China 2 Graduate School, Chinese Academy of Sciences, Beijing 100049, China 3 Earth, Environmental and atmospheric Sciences Department, university of massachusetts, lowell, mas-sachusetts ma 01854, usa 4 center for atmospheric research, university of massachusetts, lowell, massachusetts ma 01854, usa 5 Space research Institute, Austrian Academy of Sciences, Graz A-8010, Austria State Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Graduate School Chinese Academy of Sciences Space research Institute Austrian Academy of Sciences

The magnetic field variations are analyzed in the range of time periods from 4 s to 240 s in the magnetosheath observed by the Double Star TC-1 and Cluster in 2004. The characteristics of the magnetic field fluctuations are strongly controlled by the angle between the upstream interplanetary magnetic field (IMF) and the normal of the bow shock. Generally speaking, the magnetic field fluctuations in the quasi- parallel magnetosheath are more intense than those in the quasi-perpendicular ones. Almost purely compressional waves are found in the quasi-perpendicular magnetosheath. With the increase of the local plasma β, both the magnitude and direction of the magnetic field fluctuate more intensely. There exists an inverse correlation between the local temperature anisotropy T⊥/T|| and the plasma β.

关键词： low-frequency fluctuations magnetosheath MHD instabilities

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