Alignment of radio, soft X-ray, hard X-ray images of sources in impulsive and gradual phases of the flare of 1992 August 17-18

Details Alignment of radio, soft X-ray, hard X-ray images of sources in impulsive and gradual phases of the flare of 1992 August 17-18 Alignment of radio, soft X-ray, hard X-ray images of sources in impulsive and gradual phases of the flare of 1992 August 17-18

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46l..27e&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 2, p. L27-L31

Astronomy and Astrophysics

Astronomy

8

Imaging Techniques, Polarized Electromagnetic Radiation, Radio Astronomy, Solar Flares, Solar Magnetic Field, Solar Radio Emission, Thermal Emission, X Ray Astronomy, X Ray Imagery, Light Curve, Radio Interferometers, Satellite-Borne Instruments, Spectroheliographs, X Ray Telescopes

Scientific paper

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.

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