Multispacecraft observations of a foreshock-induced magnetopause disturbance exhibiting distinct plasma flows and an intense density compression

D. L. Turner; S. Eriksson; T. D. PhanV. AngelopoulosW. TuW. LiuX. LiW.-L. TehJ. P. McFaddenK.-H. Glassmeier

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Multispacecraft observations of a foreshock-induced magnetopause disturbance exhibiting distinct plasma flows and an intense density compression

机译：Multispacecraft观测的foreshock-induced磁干扰表现出不同的等离子体流动和强烈密度压缩

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Large-scale magnetopause disturbances can result from several different types of events, including those resulting from phenomena in the foreshock region. In this observational report, we present multipoint THEMIS observations of a magnetopause disturbance along the dawnside, equatorial flank that exhibits distinct flows in the magnetospheric plasma and an abnormally strong compression of the plasma density within it, which peaks at >7X the density of the near-Earth solar wind. We find that the fastest ion and electron flows are related to two different processes, the ion flows resulting from plasma being displaced around the disturbance and field-aligned electron flows, possibly related to magnetic reconnection. Interestingly, the magnetospheric plasma flows around the disturbance are very similar to those previously reported around flux transfer events, but we conclude that the disturbance is most likely the result of regions of compressed and rarified plasma density in the sheath resulting from a foreshock cavity. We present simple schematics of this foreshock cavity and its leading-edge compression region that explain many of the observed features and discuss possibilities for the intense density enhancement. Using the simultaneous THEMIS observations from the magnetosphere, magnetosheath, and solar wind, we propose that the abnormal density enhancement was the result of a combination of compression effects due to the magnetosheath and the cavity's leading-edge compression region coupled with some complex interaction near the magnetopause along the event's distinct boundary layer.

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《Journal of Geophysical Research, A. Space Physics: JGR》 |2011年第4期|A04230:1-A04230:15|共15页
作者
D. L. Turner; S. Eriksson; T. D. PhanV. AngelopoulosW. TuW. LiuX. LiW.-L. TehJ. P. McFaddenK.-H. Glassmeier;
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作者单位

Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA;

Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA;

Department of Aerospace Engineering Sciences, University of Colorado at Boulder, Boulder, CO 80309, USAInstitut fair Geophysik and Extraterrestrische Physik, Technische Universitat Braunschweig, Mendelssohnstr. 3, Braunschweig D-38106, GermanyLaboratory for Atmospheric and Space Physics, University of Colorado at Boulder, Boulder, CO 80309, USA;

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plasma density; magnetopause; Compression zonedisturbanceFlowhigh-density compressionmagnetosheathplasma flowcompression;

机译：等离子体密度;磁压缩zonedisturbanceFlowhigh-densitycompressionmagnetosheathplasma flowcompression;

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Multispacecraft observations of a foreshock-induced magnetopause disturbance exhibiting distinct plasma flows and an intense density compression

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