Physics
Scientific paper
Sep 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..114..289v&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 114, no. 2, 1987, p. 289-310.
Physics
10
Current Sheets, Magnetic Field Reconnection, Magnetohydrodynamic Stability, Solar Flares, Solar Prominences, H Alpha Line, Ion Acoustic Waves, Type 2 Bursts, X Ray Spectra
Scientific paper
After a detailed analysis in metric, decimetric, microwave, optical, and X-ray ranges the authors 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 Hα ribbons was observed. The proposed process of reconnection driven by an erupting filament can be applied to three- and four-ribbon flares.
Messerotti Mauro
Mouradian Zadig
Ruzdjak Vladimir
Urbarz H.
Vrsnak Bojan
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