The microwave and H-alpha sources of the 1992 January 13 flare

Details The microwave and H-alpha sources of the 1992 January 13 flare The microwave and H-alpha sources of the 1992 January 13 flare

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...444l.115w&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 444, no. 2, p. L115-L118

Astronomy and Astrophysics

Astrophysics

22

Comparison, H Alpha Line, Microwave Imagery, Microwaves, Radiant Flux Density, Solar Flares, X Ray Imagery, Data Correlation, Image Analysis, Image Processing, Temporal Distribution

Scientific paper

We compare X-ray, microwave and H-alpha observations for the 1992 January 13 limb flare. The soft and hard X-ray images of the flare have been studied thoroughly by Masuda et al. (1994) with Yohkoh SXT and HXT images. We find that during the hard X-ray emission peak there is no H-alpha brightening on the disk nor at the limb, so the main ribbons of this flare must be beyond the limb. The microwave source maintains a fixed distance about 10 arcsecs from the optical limb in the frequency range 2.8-14.0 GHz. We interpret this limit in source position as due to the presence of a microwave limb that extends higher than the white-light limb -- to a height of 7300 +/- 1500 km. We believe that the high-frequency microwave emissions are occulted by this extended limb, while the soft and hard X-ray emissions are able to pass through largely unaffected. We also believe, however, that the hard X-ray footpoints are also partially occulted by the photospheric limb, despite the appearance of 'footpoint sources' in HXT data shown by Masuda et al. The smooth X-ray and microwave time profiles, microwave-rich emission relative to hard X-rays, and progressive hard X-ray spectral hardening through the flare peak are all characteristics that we interpret as being a direct result of the occultation of footpoint emission.

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