Abstract
We investigate radio and X-ray imaging data for two solar flares in
order to test the idea that asymmetric precipitating of nonthermal
electrons at the two ends of a magnetic loop is consistent with the
magnetic mirroring explanation. The events we present were observed
in 1993 May by the HXT and SXT X-ray telescopes on the Yohkoh spacecraft
and by the Nobeyama 17 GHz radioheliograph .
The hard X-ray images in one case show two well-separated sources; the radio
images indicate circularly polarized, nonthermal radio emission
with opposite polarities from these two sources, indicating oppositely
directed fields and consistent with a single-loop model.
In the second event there are several sources in the HXT images which
appear to be connected by soft X-ray loops. The strongest hard X-ray
source has unpolarized radio emission, whereas the
strongest radio emission lies over strong magnetic fields and is polarized.
In both events the strongest radio emission is highly polarized and not coincident
with the strongest hard X-ray emission.
This is consistent with asymmetric loops in which the bulk of the precipitation
(and hence the X-ray emission) occurs at the weaker field footpoint.
Subject headings: Sun: flares - Sun: radio radiation - Sun:X-rays, gamma rays