Formation of coronal rain triggered by impulsive heating associated with magnetic reconnection
| Autor: | Clara Froment, Erwin Verwichte, Petra Kohutova |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
010504 meteorology & atmospheric sciences Computer Science::Information Retrieval FOS: Physical sciences Astronomy and Astrophysics Magnetic reconnection Context (language use) Plasma Coronal loop Astrophysics 01 natural sciences Magnetic field Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Coronal plane Physics::Space Physics 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Coronal rain 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Line (formation) |
| Zdroj: | Astronomy & Astrophysics. 630:A123 |
| ISSN: | 1432-0746 0004-6361 |
| Popis: | Coronal rain consists of cool plasma condensations formed in coronal loops as a result of thermal instability. The standard models of coronal rain formation assume that the heating is quasi-steady and localised at the coronal loop footpoints. We present an observation of magnetic reconnection in the corona and the associated impulsive heating triggering formation of coronal rain condensations. We analyse combined SDO/AIA and IRIS observations of a coronal rain event following a reconnection between threads of a low-lying prominence flux rope and surrounding coronal field lines. The reconnection of the twisted flux rope and open field lines leads to a release of magnetic twist. Evolution of the emission of one of the coronal loops involved in the reconnection process in different AIA bandpasses suggests that the loop becomes thermally unstable and is subject to the formation of coronal rain condensations following the reconnection and that the associated heating is localised in the upper part of the loop leg. We conclude that in addition to the standard models of thermally unstable coronal loops with heating localised exclusively in the footpoints, thermal instability and subsequent formation of condensations can be triggered by the impulsive heating associated with magnetic reconnection occurring anywhere along a magnetic field line. Comment: 9 pages, 6 figures, accepted by A&A |
| Databáze: | OpenAIRE |
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