Observations of a subcritical switch-on shock

H. Q. Feng; J. M. Wang; J. K. Chao

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Observations of a subcritical switch-on shock

机译：Observations of a subcritical switch-on shock

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Context. The conditions that lead to subcritical switch-on shocks are very rare in interplanetary space.Aims. In this work, we report the identification of a subcritical switch-on shock driven by an interplanetary coronal mass ejection.Methods. The subcritical switch-on shock is identified by fitting the Rankine-Hugoniot (R-H) conditions.Results. It is found that the shock has the following characteristics. (1) Proton density, temperature, and total magnetic field strengthall increase from the upstream region to the downstream region. (2) Observed parameters meet the R-H relations closely. (3) Thefast-mode Mach number is greater than unity in the preshock state and less than unity in the postshock state. (4) The normal Alfven-Mach number is almost equal to 1 in the postshock state, while the upstream tangential magnetic component is around zero but thedownstream tangential magnetic component is not zero (it is "switched on").Conclusions. Considering that the shock parameters satisfy all the properties of subcritical switch-on shocks, we conclude that thediscontinuity is a subcritical switch-on shock.

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《Astronomy and astrophysics》 |2009年第1期|203-206|共4页
作者
H. Q. Feng; J. M. Wang; J. K. Chao;
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作者单位

Institute of Space Science, National Central University, Chungli 32001, Taiwan;

College of Physics and Electronic Information, Luoyang Normal University, Luoyang 471022, PR China;

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正文语种英语
中图分类天文学;
关键词
shock waves — Sun; coronal mass ejections (CMEs) — Sun; solar wind;

Observations of a subcritical switch-on shock

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