Electron Acceleration During a Long-duration Flare

S. Pohjolainen1,2, N. Vilmer1, and A. Magun3

1 Observatoire de Paris, DASOP, 5 Place Jules Janssen, F-92195 Meudon, France

2 Metsahovi Radio Observatory, P.O Box 3000, FIN-02015 HUT, Finland

3 Institute of Applied Physics, Sichlerstrasse 5, 3012 Bern, Switzerland

We present a multi-wavelength study of a near-limb flare (S10E56) that occurred on June 27, 1993, between 11:15 UT and 12:40 UT. The flare was classified as 2N in Ha, and as GOES class M3.6. BATSE and Yohkoh observed the beginning of the flare, with impulsive flux evolution especially in the lower X-ray energy channels. The millimeter and centimeter radio flux from the flare site (Metsahovi and Bern observations) indicate a typical long-duration, gradual type event. The Nancay Radioheliograph data, recorded at five frequencies between 164 and 435 MHz, show impulsive bursts occuring near the east limb, starting at 11:20 UT. Near 11:33 UT, at the time of the millimeter wave maximum, further continuum emission is seen at decimetric wavelengths. We present here the preliminary results of the temporal and spatial evolution of the flare observed between millimeter-centimeter and decimeter-meter waves, investigating in particular electron acceleration in the later phase of the flare.