A COMPARISON OF THE INITIAL SPEED OF CORONAL MASS EJECTIONS WITH THE MAGNETIC FLUX AND MAGNETIC HELICITY OF MAGNETIC CLOUDS
- Korea Astronomy and Space Science Institute, Space Science Division, Solar and Space Weather Research Group, Daejeon (Korea, Republic of)
- Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul (Korea, Republic of)
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{sub CME}) and the two parameters of their associated magnetic clouds (MC), magnetic flux (F{sub MC}), and magnetic helicity per unit length (|H{sub MC}|/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 V {sup 2}{sub CME} and F{sub MC}, and between V{sup 2} {sub CME} and |H{sub MC}|/L. It is also found that the kinetic energy of CMEs (E{sub CME}) is correlated with F{sub MC} and |H{sub MC}|/L of the associated MC. In contrast, we found no significant correlation between (V{sub MC}){sup 2} and F{sub MC}, nor between (V{sub MC}){sup 2} and |H{sub MC}|/L. Our results support the notion that the eruption of a CME is related to the magnetic helicity of the source active region.
- OSTI ID:
- 21307646
- Journal Information:
- Astrophysical Journal, Vol. 699, Issue 1; Other Information: DOI: 10.1088/0004-637X/699/1/298; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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