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Continuum Enhancements, Line Profiles, and Magnetic Field Evolution during Consecutive Flares
- Source :
- The Astrophysical Journal, Mathioudakis, M & Keys, P 2020, ' Continuum enhancements, line profiles and magnetic field evolution during consecutive flares ', The Astrophysical Journal . https://doi.org/10.3847/1538-4357/ab621f
- Publication Year :
- 2020
-
Abstract
- During solar flares, magnetic energy can be converted into electromagnetic radiation from radio waves to $\gamma$ rays. Enhancements in the continuum at visible wavelengths give rise to white-light flares, as well as continuum enhancements in the FUV and NUV passbands. 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 (IRIS, SDO/HMI, Hinode/SOT) and ground-based telescopes (ROSA/DST) during two consecutive C7.0 and X1.6 flares 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 \textit{IRIS} spectra. In the latter, a prominent blue-shifted component is observed at the onset of the eruption. We investigate the role played by the evolution of the $\delta$ 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.<br />Comment: 19 pages, accepted for ApJ; some figures are in B/W to accomplish size limits
- Subjects :
- 010504 meteorology & atmospheric sciences
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences
Astrophysics
01 natural sciences
Electromagnetic radiation
Solar flares (1496)
Solar ultraviolet emission (1533)
Spectral line
law.invention
Active solar chromosphere (1980)
Physics - Space Physics
law
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
010303 astronomy & astrophysics
Solar and Stellar Astrophysics (astro-ph.SR)
0105 earth and related environmental sciences
Solar white-light flares (1983)
Solar magnetic reconnection (1504)
Solar chromosphere (1479)
Solar photosphere (1518)
Solar transition region (1532)
Solar magnetic fields (1503)
High resolution spectroscopy (2096)
Physics
Sunspot
Solar flare
Magnetic energy
Astronomy and Astrophysics
Space Physics (physics.space-ph)
Magnetic field
Astrophysics - Solar and Stellar Astrophysics
13. Climate action
Space and Planetary Science
Physics::Space Physics
Radio wave
Flare
Subjects
Details
- ISSN :
- 15384357, 0004637X, 00046361, 00046264, and 00046248
- Database :
- OpenAIRE
- Journal :
- The Astrophysical Journal
- Accession number :
- edsair.doi.dedup.....34a4131dfb0a4a4448997f3a2aad57d8
- Full Text :
- https://doi.org/10.3847/1538-4357/ab621f