Details

Autor(en) / Beteiligte

• Eselevich, M. V.
• Eselevich, V. G.

Titel

Some properties of the development of the perturbed zone and shock preceding a coronal mass ejection

Ist Teil von

• Astronomy reports, 2011-11, Vol.55 (11), p.1038-1050

Ort / Verlag

Dordrecht: SP MAIK Nauka/Interperiodica

Erscheinungsjahr

2011

Quelle

SpringerLink

Beschreibungen/Notizen

• SOHO/LASCO C2 and C3 data have been used to carry out a detailed study of the perturbed zone and shock that form as a coronal mass ejection (CME) moves away from the Sun, as a result of its interaction with the ambient solar wind. The event of January 4, 2002 is used as an example. The perturbed zone is most extensive along the direction of propagation of the CME, decreases away from this direction, and reaches its minimum values perpendicular to this direction. The mass of the perturbed zone is ≥0.1 of the total mass of the CME. The condition for the formation of a shock preceding the CME (in the direction of propagation of the CME) is V − V SW > V A , where V , V SW , and V A are the CME, solar wind, and Alfvén velocities, respectively. Perpendicular to the CME axis, at distances of ≈4–6 R ⊙ fromthe center of the Sun, the condition for the formation of shock is V /2 > V A .