Flux Emergence and Generation of Flare-productive Active Regions
Abstract
Observations revealed that the delta-sunspots, in which opposite polarities are closely neighboring that they share a common penumbra, produce the strongest solar flares in history. Within the delta-spots, magnetic flux ropes are sometimes observed above the sheared polarity inversion lines before the flare onset. In this talk, we review the generation mechanisms of delta-spots and such magnetic structures from both observational and theoretical points of view, based on the recently published Living Reviews article (Toriumi & Wang 2019). We show that the advances of observational capabilities in the past decades significantly improved our understanding, whereas state-of-the-art radiative MHD simulations can now reproduce the flux emergence and spontaneous generation of delta-spots, sheared polarity inversion lines, and magnetic flux ropes.
- Publication:
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43rd COSPAR Scientific Assembly. Held 28 January - 4 February
- Pub Date:
- January 2021
- Bibcode:
- 2021cosp...43E1731T