The EIT coil-like structure in the March 20, 2000 eruptive prominence

Astronomical Institute, Academy of Sciences, 251 65 Ondřejov, Czech Republic

Corresponding author: M. Karlický, karlicky@sunkl.asu.cas.cz

Received: 9 August 2001
Accepted: 18 February 2002

Abstract

The evolution of the March 20, 2000 prominence eruption observed in the 195 Å (EIT/SOHO), Hα, (MDI/SOHO), 1–3 GHz radio and hard X-ray (BATSE) was analyzed. A unique EIT coil-like structure with a hot core, indicating an electric current, was observed at the beginning of the prominence eruption. This structure with about 5 turns was associated with the reverse drift radio bursts at 1.0–2.5 GHz and the 33–57 keV hard X-ray emission. The hot core observation confirmed our recent suggestion about heating inside the eruptive prominence. Comparing the form of the EIT filament in the pre-eruption phase with the magnetic field map the presence of the electric current was confirmed. It was suggested that the relatively slow drifts of the reverse drift bursts can be due to a beam propagating in a vertical coil-like (helical) structure. Plasma processes and parameters in the eruptive prominence were discussed.