Abstract
This is a preliminary report concerning an impulsive flare, which
occurred on 1992 August 17-18,
and was observed with
the Nobeyama Radioheliograph, Yohkoh, and
ground-based instruments.
Emphasis is put on the alignment of radio images as well as soft X-ray
and hard X-ray maps,
which are compared in both impulsive and gradual phases. In the
impulsive phase, which continued
for about 30 sec, nonthermal emission was most remarkable at 17 GHz, and
was also seen in hard
X-rays at the southern part of the Soft X-ray Telescope (SXT) source,
which was about 14 sec
width and 80 sec long, extending in the north-east to south-west
direction. Thermal emission
was detected in soft X-rays and possibly in hard X-rays at the northern
part. During the gradual
phase, about 80 sec after the onset of the impulsive phase, thermal
emission dominated and was
located at the northern part of the source over the entire energy range.
Difficulties are discussed
concerning a possible simple topology of the magnetic fields.