Disturbed region and a shock wave driven by a coronal mass ejection

Details Disturbed region and a shock wave driven by a coronal mass ejection Disturbed region and a shock wave driven by a coronal mass ejection

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009ge%26ae..49.1157e&link_type=abstract

Geomagnetism and Aeronomy, Volume 49, Issue 8, pp.1157-1159

Physics

Scientific paper

The existence of a disturbed region in front of a coronal mass ejection (CME) has been proved; its variation with increasing CME velocity has been investigated. It has been shown that a plasma density discontinuity, which can be interpreted as a shock wave, is formed in front of the disturbed region at CME velocities that are about or above the local Alfvén velocity. Within the experimental error, the observed shock-front width is estimated to be about the mean free path for proton-proton collisions at distances R < 15-20 R &sun; from the center of the Sun; i.e., the energy dissipation mechanism in the front is conceivably collisional at these distances.

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