Filament Leg-Leg Reconnection as a Source of Prominent Supra-arcade Downflows

0561622 - ASÚ 2023 RIV US eng J - Journal Article
Dudík, Jaroslav - Aulanier, G. - Kašparová, Jana - Karlický, Marian - Zemanová, Alena - Lörinčík, J. - Druckmüller, M.
Filament Leg-Leg Reconnection as a Source of Prominent Supra-arcade Downflows.
Astrophysical Journal Letters. Roč. 937, č. 1 (2022), č. článku L10. ISSN 2041-8205. E-ISSN 2041-8213
R&D Projects: GA ČR GA20-07908S
Institutional support: RVO:67985815
Keywords : solar flares * solar filament eruptions * solar magnetic reconnection
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 7.9, year: 2022
Method of publishing: Open access

We report on the interaction of the legs of the erupting filament of 2012 August 31 and associated prominent supra-arcade downflows (P-SADs) as observed by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory. We employ a number of image processing techniques to enhance weak interacting features. As the filament erupts, both legs stretch outwards. The positive-polarity leg also untwists and splits into two parts. The first part runs into the conjugate (negative-polarity) leg, tearing it apart. The second part then converges into the remnant of the conjugate leg, after which both weaken and finally disappear. All these episodes of interaction of oppositely oriented filament legs are followed by the appearance of P-SADs, seen in the on-disk projection to be shaped as loop tops, along with many weaker SADs. All SADs are preceded by hot supra-arcade downflowing loops. This observed evolution is consistent with the three-dimensional rr-rf (leg-leg) reconnection, where the erupting flux rope reconnects with itself. In our observations, as well as in some models, the reconnection in this geometry is found to be long lasting. It plays a substantial role in the evolution of the flux rope of the erupting filament and leads to prominent SADs.
Permanent Link: https://hdl.handle.net/11104/0334223