Active-Region Filaments and X-ray Sigmoids |
| |
| Authors: | Pevtsov Alexei A |
| |
| Institution: | (1) National Solar Observatory/Sacramento Peak, Sunspot, NM, 88349, U.S.A. |
| |
| Abstract: | We use Yohkoh soft X-ray telescope data and H full-disk observations to study the evolution of chromospheric filaments and coronal sigmoids in 6 active regions in association with coronal mass ejections (CMEs). In two cases, CMEs are directly observed by the SOHO/LASCO C2 coronagraph. In four cases, other observations (magnetic clouds, geomagnetic storms, sigmoid-arcade evolution) are used as CME indicators. Prior to eruption, each active region shows a bright coronal sigmoidal loop and underlying H filament. The sigmoid activates, erupts and gets replaced by a cusp, or an arcade. In contrast, the H filament shows no significant changes in association with sigmoid eruption and CME. We explain these observations in a framework of the classical two-ribbon flare model. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
