Abstract
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.
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Supported by the CAS (Grant No. KJCX2-YW-T13) and the National Natural Science Foundation of China (Grant Nos. 40621003, 40628003, 40390150)
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Du, J., Wang, C., Song, P. et al. Low-frequency fluctuations in the magnetosheath: Double Star TC-1 and Cluster observations. Sci. China Ser. E-Technol. Sci. 51, 1626–1638 (2008). https://doi.org/10.1007/s11431-008-0250-2
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DOI: https://doi.org/10.1007/s11431-008-0250-2