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Expanding and Contracting Coronal Loops as Evidence of Vortex Flows Induced by Solar Eruptions
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SYSNO ASEP 0478680 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Expanding and Contracting Coronal Loops as Evidence of Vortex Flows Induced by Solar Eruptions Author(s) Dudík, Jaroslav (ASU-R) RID, ORCID
Zuccarello, F. (IT)
Aulanier, G. (FR)
Schmieder, B. (FR)
Démoulin, P. (FR)Source Title Astrophysical Journal - ISSN 0004-637X
Roč. 844, č. 1 (2017), 1/1-1/15Number of pages 15 s. Publication form Print - P Language eng - English Country US - United States Keywords data analysis ; Sun ; corona Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics OECD category Astronomy (including astrophysics,space science) R&D Projects GA17-16447S GA ČR - Czech Science Foundation (CSF) Institutional support ASU-R - RVO:67985815 UT WOS 000406015000017 EID SCOPUS 85026382218 DOI 10.3847/1538-4357/aa7aab Annotation Eruptive solar flares were predicted to generate large-scale vortex flows at both sides of the erupting magnetic flux rope. This process is analogous to a well-known hydrodynamic process creating vortex rings. The vortices lead to advection of closed coronal loops located at the peripheries of the flaring active region. Outward flows are expected in the upper part and returning flows in the lower part of the vortex. Here, we examine two eruptive solar flares, the X1.1-class flare SOL2012-03-05T03: 20 and the C3.5-class SOL2013-06-19T07:29. In both flares, we find that the coronal loops observed by the Atmospheric Imaging Assembly in its 171 angstrom, 193 angstrom, or 211 angstrom passbands show coexistence of expanding and contracting motions, in accordance with the model prediction. In the X-class flare, multiple expanding and contracting loops coexist for more than 35 minutes, while in the C-class flare, an expanding loop in 193 angstrom appears to be close by and cotemporal with an apparently imploding loop arcade seen in 171 angstrom. Later, the 193 angstrom loop also switches to contraction. These observations are naturally explained by vortex flows present in a model of eruptive solar flares. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2018
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