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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Original Russian Text © M.V. Eselevich, V.G. Eselevich, 2007, published in Astronomicheskiĭ Zhurnal, 2007, Vol. 84, No. 11, pp. 1046–1054.
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Eselevich, M.V., Eselevich, V.G. First experimental studies of a perturbed zone preceding the front of a coronal mass ejection. Astron. Rep. 51, 947–954 (2007). https://doi.org/10.1134/S1063772907110078
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DOI: https://doi.org/10.1134/S1063772907110078