Reconnection driven by an erupting filament in the May 14, 1981 flare |
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| Authors: | B Vr?nak V Ru?djak M Messerotti Z Mouradian H Urbarz P Zlobec |
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| Institution: | (1) Hvar Observatory, 58450 Hvar, Yugoslavia;(2) Osservatorio Astronomico Trieste, Via G.B. Tiepolo 11, I 34131 Trieste, Italia;(3) DASOP, Observatoire de Meudon, 92195 Meudon, France;(4) Astronomisches Institut, Aussenstelle Weissenau, D-7980 Ravensburg/Rasthalde;(5) Osservatorio Astronomico Trieste, Via G.B. Tiepolo 11, I 34131 Trieste, Italia |
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| Abstract: | We present observations of the flare of May 14, 1981, which can be classified as a three-ribbon flare. After a detailed analysis in metric, decimetric, microwave, optical, and X-ray ranges we propose that the event was caused by a reconnection process driven by erupting filament. The energy was liberated in the current sheet above the filament in the region between the erupting flux and the overlying field. It is shown that plasma microinstabilities develop as the plasma enters the current sheet. The observations indicate that during the precursor phase a certain low-frequency turbulence, such as ion-accoustic turbulence had to be present.The reconnection rate was growing due to the increasing tension of the stretched overlying field. It is shown that the reconnection proceeded in the Sonnerup-Petschek regime during the precursor, and changed to the pile-up regime in the fast reconnection phase, when the maximal lateral expansion (50 km s–1) of the H ribbons was observed. The proposed process of reconnection driven by an erupting filament can be applied to three- and four-ribbon flares. |
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