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Modeling Repeatedly Flaring δ Sunspots
Piyali Chatterjee1,2, Viggo Hansteen1, Mats Carlsson1
1Institute of Theoretical Astrophysics, University of Oslo, P.O. Box 1029 Blindern, N-0315 Oslo, Norway.
Physical Review Letters
|March 26, 2016
Summary
This study simulates the Sun's active regions, revealing how initial magnetic sheets evolve into complex sunspot systems. The simulation successfully reproduces superactive delta sunspots and associated phenomena like solar flares and coronal mass ejections.
Area of Science:
- Solar physics
- Plasma astrophysics
- Heliophysics
Background:
- Solar active regions are classified by magnetic complexity, with delta sunspots being the most active.
- Delta sunspots are associated with powerful solar flares and coronal mass ejections.
Purpose of the Study:
- To simulate the formation and evolution of solar active regions from a primitive magnetic state.
- To investigate the origins of delta sunspots and their associated energetic phenomena.
Main Methods:
- A numerical simulation mimicking the Sun's upper layers and corona.
- Initiation from a primitive state with a thin subphotospheric magnetic sheet.
- Modeling the emergence and interaction of magnetic flux tubes.
Main Results:
- The simulation produced colliding-merging sunspot systems of opposite polarity.
- Exotic delta sunspot configurations and associated phenomena were observed.
- The simulation generated repeated flaring and ejective helical flux ropes resembling solar coronal mass ejections.
Conclusions:
- The simulation demonstrates a plausible mechanism for delta sunspot formation and associated eruptive events.
- This model provides insights into the complex magnetic processes driving solar activity.
- The findings align with observed solar flare and coronal mass ejection characteristics.
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