Flaring activity and related eruptions from active regions
Abstract
The Sun produces major eruptions, known as coronal mass ejections, from a range of heights in its atmosphere and across a range of kinematic and spatial scales. From compact, fast active region eruptions to high-altitude, slow stealth CMEs. These eruptions are the most energetic phenomena in the Solar System and CMEs that reach the Earth can create severe space events. Many studies have now shown that magnetic flux ropes are a fundamental component of the pre-eruption corona in some cases. In addition, a key role appears to be played by magnetic reconnection that evolves the pre-eruption corona from a sheared arcade to a flux rope configuration, which can then be destabilised by an ideal MHD process or by further magnetic reconnection. This talk will look CMEs originating in active regions covering the spectrum of events from energetic CMEs to low-energy stealth CMEs, and will ask whether there are common processes taking place across this wide range and whether flux ropes are involved in all cases. A long-term perspective will be given using observational and modelling results. The emergence of flux that forms the active region will be discussed along with the evolution of this flux via photospheric flows. Finally, thought will be given on the role of the ambient coronal field on the destabilisation of the CME structure.
- Publication:
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43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E.992G