A Study of Surges: II. On the Relationship between Chromospheric Surges and Coronal Mass Ejections |
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| Authors: | Yu Liu |
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| Institution: | (1) Institute for Astronomy, University of Hawaii, 34 Ohia Ku Street, Pukalani, HI 96768, USA |
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| Abstract: | Liu et al. (Astrophys. J.
628, 1056, 2005a) described one surge – coronal mass ejection (CME) event showing a close relationship between solar chromospheric surge ejection
and CME that had not been noted before. In this work, large Hα surges (>72 Mm, or 100 arcsec) are studied. Eight of these
were associated with CMEs. According to their distinct morphological features, Hα surges can be classified into three types:
jetlike, diffuse, and closed loop. It was found that all of the jetlike surges were associated with jetlike CMEs (with angular
widths ≤30 degrees); the diffuse surges were all associated with wide-angle CMEs (e.g., halo); the closed-loop surges were not associated with CMEs. The exclusive relation between Hα surges and CMEs indicates
difference in magnetic field configurations. The jetlike surges and related narrow CMEs propagate along coronal fields that
are originally open. The unusual transverse mass motions in the diffuse surges are suggested to be due to magnetic reconnections
in the corona that produce wide-angle CMEs. For the closed-loop surges, their paths are just outlining stable closed loops
close to the solar surface. Thus no CMEs are associated with them. |
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| Keywords: | Sun: chromosphere Sun: surges Sun: coronal mass ejections |
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