First experimental studies of a perturbed zone preceding the front of a coronal mass ejection

Details First experimental studies of a perturbed zone preceding the front of a coronal mass ejection First experimental studies of a perturbed zone preceding the front of a coronal mass ejection

Nov 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007arep...51..947e&link_type=abstract

Astronomy Reports, Volume 51, Issue 11, pp.947-954

Astronomy and Astrophysics

Astronomy

3

96.60.Ph, 96.60.Xy, 96.50.Ci, 96.50.Xy, 96.50.Tf, 95.55.Fw, 95.85.Kr

Scientific paper

The first experimental evidence for a perturbed zone that is likely filled with fast magnetoacoustic oscillations and precedes a coronal mass ejection is presented. When the speed of the coronal mass ejection exceeds the Alfven speed, an outward-moving discontinuity of the plasma density is observed in front of the perturbed zone, on scales comparable to the mean-free path for proton-proton collisions. This suggests that this discontinuity should be interpreted as a collisional shock at distances of R < 30 R &sun; (where R &sun; is the solar radius).

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