A Comparison of the Initial Speed of Coronal Mass Ejections with the Magnetic Flux and Magnetic Helicity of Magnetic Clouds

Details A Comparison of the Initial Speed of Coronal Mass Ejections with the Magnetic Flux and Magnetic Helicity of Magnetic Clouds A Comparison of the Initial Speed of Coronal Mass Ejections with the Magnetic Flux and Magnetic Helicity of Magnetic Clouds

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apj...699..298s&link_type=abstract

The Astrophysical Journal, Volume 699, Issue 1, pp. 298-304 (2009).

Astronomy and Astrophysics

Astronomy

3

Sun: Coronal Mass Ejections, Sun: Magnetic Fields, Solar-Terrestrial Relations

Scientific paper

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 (|H 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 2 CME and F MC, and between V 2 CME and |H MC|/L. It is also found that the kinetic energy of CMEs (E CME) is correlated with F MC and |H MC|/L of the associated MC. In contrast, we found no significant correlation between langV MCrang2 and F MC, nor between langV MCrang2 and |H MC|/L. Our results support the notion that the eruption of a CME is related to the magnetic helicity of the source active region.

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