A COMPARISON OF THE INITIAL SPEED OF CORONAL MASS EJECTIONS WITH THE MAGNETIC FLUX AND MAGNETIC HELICITY OF MAGNETIC CLOUDS

作者：Sung S K^*; Marubashi K; Cho K S; Kim Y H; Kim K H; Chae J; Moon Y J; Kim I H

来源：Astrophysical Journal, 2009, 699(1): 298-304.

DOI：10.1088/0004-637X/699/1/298

• Sun: coronal mass ejections
• Sun: magnetic fields
• solar-terrestrial relations

To investigate the relationship between the speed of a coronal mass ejection (CME) and the magnetic energy released during its eruption, we have compared the initial speed of CMEs (V(CME)) and the two parameters of their associated magnetic clouds (MC), magnetic flux (F(MC)), and magnetic helicity per unit length (vertical bar H(MC)vertical bar/L), for 34 pairs of CMEs and MCs. The values of these parameters in each MC have been determined by fitting the magnetic data of the MC to the linear force-free cylindrical model. As a result, we found that there are positive correlations between VCME2 and FMC, and between V(CME)(2) and vertical bar H(MC)vertical bar/L. It is also found that the kinetic energy of CMEs (E(CME)) is correlated with F(MC) and vertical bar H(MC)vertical bar/L of the associated MC. In contrast, we found no significant correlation between < V(MC)>(2) and F(MC), nor between < V(MC)>(2) and vertical bar H(MC)vertical bar/L. Our results support the notion that the eruption of a CME is related to the magnetic helicity of the source active region.

• 出版日期2009-7-1