Continuum Enhancements, Line Profiles, and Magnetic Field Evolution during Consecutive Flares
Abstract
During solar flares, magnetic energy can be converted into electromagnetic radiation from radio waves to γ-rays. Enhancements in the continuum at visible wavelengths, as well as continuum enhancements in the FUV and NUV passbands, give rise to white-light flares. In addition, the strong energy release in these events can lead to the rearrangement of the magnetic field at the photospheric level, causing morphological changes in large and stable magnetic structures like sunspots. In this context, we describe observations acquired by satellite instruments (Interface Region Imaging Spectrograph (IRIS), Solar Dynamics Observatory/Helioseismic and Magnetic Imager, Hinode/Solar Optical Telescope) and ground-based telescopes (Rapid Oscillations in the Solar Atmosphere (ROSA)/Dunn Solar Telescope) during two consecutive C7.0 and X1.6 flares that occurred in active region NOAA 12205 on 2014 November 7. The flare was accompanied by an eruption. The results of the analysis show the presence of continuum enhancements during the evolution of the events, observed both in ROSA images and in IRIS spectra. In the latter, a prominent blueshifted component is observed at the onset of the eruption. We investigate the role played by the evolution of the δ sunspots of the active region in the flare triggering, and finally we discuss the changes in the penumbrae surrounding these sunspots as a further consequence of these flares.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 2020
- DOI:
- 10.3847/1538-4357/ab621f
- arXiv:
- arXiv:1912.00859
- Bibcode:
- 2020ApJ...889...65Z
- Keywords:
-
- Solar flares;
- Solar white-light flares;
- Solar magnetic reconnection;
- Active solar chromosphere;
- Solar chromosphere;
- Solar photosphere;
- Solar transition region;
- Solar ultraviolet emission;
- Solar magnetic fields;
- High resolution spectroscopy;
- 1496;
- 1983;
- 1504;
- 1980;
- 1479;
- 1518;
- 1532;
- 1533;
- 1503;
- 2096;
- Astrophysics - Solar and Stellar Astrophysics;
- Physics - Space Physics
- E-Print:
- 19 pages, accepted for ApJ