Coronal "wave":: Magnetic footprint of a coronal mass ejection?

被引:207
作者
Attrill, Gemma D. R.
Harra, Louise K.
Van Driel-Gesztelyi, Lidia
Demoulin, Pascal
机构
[1] UCL, Mullard Space Sci Lab, Surrey, England
[2] Observ Paris, LESIA, CNRS, UMR 8109, Meudon, France
[3] Konkoly Observ Budapest, Budapest, Hungary
关键词
Sun : activity; Sun : coronal mass ejections (CMEs); Sun : filaments; Sun : magnetic fields;
D O I
10.1086/512854
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the properties of two "classical" EUV Imaging Telescope (EIT) coronal waves. The two source regions of the associated coronal mass ejections (CMEs) possess opposite helicities, and the coronal waves display rotations in opposite senses. We observe deep core dimmings near the flare site and also widespread diffuse dimming, accompanying the expansion of the EIT wave. We also report a new property of these EIT waves, namely, that they display dual brightenings: persistent ones at the outermost edge of the core dimming regions and simultaneously diffuse brightenings constituting the leading edge of the coronal wave, surrounding the expanding diffuse dimmings. We show that such behavior is consistent with a diffuse EIT wave being the magnetic footprint of a CME. We propose a new mechanism where driven magnetic reconnections between the skirt of the expanding CME magnetic field and quiet-Sun magnetic loops generate the observed bright diffuse front. The dual brightenings and the widespread diffuse dimming are identified as innate characteristics of this process.
引用
收藏
页码:L101 / L104
页数:4
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