Physics
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3522105e&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 22, CiteID L22105
Physics
11
Interplanetary Physics: Coronal Mass Ejections (7513), Interplanetary Physics: Interplanetary Shocks, Interplanetary Physics: Solar Wind Plasma
Scientific paper
It is shown that in front of a coronal mass ejection, having a velocity u lower than the critical u C relative to the surrounding coronal plasma, there is a disturbed region expended along a direction of the CME propagation. The time difference brightness (plasma density) in the disturbed region smoothly decreases to larger distances in front of the CME. A discontinuity forms at u higher than u C in the disturbed region front part in radial distributions of the difference brightness. Since the u C value is close to the local fast-mode MHD velocity, which in corona approximately equal to the Alfven one, the formation of such a discontinuity when u C is exceeded may be identified with the formation of a shock wave.
Eselevich M. V.
Eselevich V. G.
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