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所属单位：航天学院

发表刊物：PHYSICS OF PLASMAS

关键字：LOW-FREQUENCY WAVES WHISTLER-MODE SHOCK

摘要：Near-parallel and highly oblique magnetosonic/whistler (M/W) mode waves are frequently observed in solar wind and interplanetary shocks. These observed waves are usually analyzed by the plasma kinetic and fluid theories. This study compares the dispersion surface and electromagnetic responses of the M/W mode wave under both kinetic and fluid theories in the plasmas with beta(p) = beta(e) similar or equal to 1 in detail. In comparison with the kinetic theory, it proposes that the hot fluid theory is suitable to obtain the dispersion relation, the ratio of the parallel to perpendicular magnetic fluctuation B-z/B-perpendicular to, and the ratio of the electric to magnetic fluctuation E/B. Except the near-parallel low-frequency M/W mode, the hot fluid theory would be used to calculate the ratio between two magnetic fluctuations perpendicular to the wave vector B-1/B-2, the magnetic helicity sigma, and the ratio of the parallel to perpendicular electric fluctuation E-z/E-perpendicular to of the M/W mode waves. The cold fluid theory is good at describing the magnetic responses including B-z/B-perpendicular to, B-1/B-2, and sigma, but it underestimates omega, E/B, and E-z/E-perpendicular to for the obliquely propagating M/W mode wave. Furthermore, both hot and cold fluid theories can obtain the ratio of the longitudinal to transverse electric fluctuation relative to the wave vector E-L/E-P of the obliquely propagating low-frequency M/W mode. These results provide an indicator about how to choose the adequate theory to analyze the observations of the M/W mode waves in the solar wind and interplanetary shocks. Besides, from the dispersion surface in kinetic theory, it shows that the relative weak damping arises for the low-frequency branch at the angle around 0 degrees, 60 degrees, and 90 degrees and for the high-frequency branch with omega similar to [omega(cp), 300 omega(cp)] at the normal angle smaller than 60 degrees, which indicates the possible angle and frequency of the freely propagating M/W mode waves. Published under license by AIP Publishing.

ISSN号：1070-664X

是否译文：否

发表时间：2019-02-01

合写作者：Zhao, Hanqing,Zhao, Jinsong,Sun, Heyu,Shi, Chen,F70206601,Liu, Zhifeng

通讯作者：Zhao, Jinsong,黄朝艳