Observations of a switch-off shock in interplanetary space

Details Observations of a switch-off shock in interplanetary space Observations of a switch-off shock in interplanetary space

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11305216f&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A5, CiteID A05216

Physics

2

Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Wind Plasma, Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Interplanetary Physics: Interplanetary Magnetic Fields, Interplanetary Physics: Discontinuities (7811)

Scientific paper

An interplanetary slow shock event was observed by Voyager 1 on 1 November 1980. The structure is identified to be a switch-off shock which is a special type of slow shocks by fitting the Rankine-Hugoniot relations. The shock has the following properties: (1) Observed parameters meet the R-H relations well. (2) Number density increases from the upstream region to the downstream region. On the contrary, total magnetic field strength decreases. (3) The slow-mode Mach number is greater than unity in the preshock state and less than unity in the postshock state. (4) The normal Alfvén-Mach number is almost equal to 1 in the preshock state; the tangential component of the downstream magnetic field is ``turned off,'' leaving only a minor quantity along the shock normal.

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