First experimental studies of a perturbed zone preceding the front of a coronal mass ejection |
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| Authors: | M V Eselevich V G Eselevich |
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| Institution: | (1) Institute of Solar-Terrestrial Physics, Siberian Division, Russian Academy of Sciences, P.O. Box 4, Irkutsk, 664033, Russia |
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| Abstract: | 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 ⊙ (where R ⊙ is the solar radius). |
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