X-ray and radio emissions in the early stages of solar flares

Details X-ray and radio emissions in the early stages of solar flares X-ray and radio emissions in the early stages of solar flares

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983soph...83..267b&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 83, March 1983, p. 267-283. Research supported by the Centre National d'Etudes Spatiales, I

Physics

47

Solar Flares, Solar Radio Emission, Solar X-Rays, Goes 2, Radio Spectra, Solar Maximum Mission, Type 3 Bursts, X Ray Spectra

Scientific paper

Radio and X-ray observations are presented for three flares which show significant activity for several minutes prior to the main impulsive increase in the hard X-ray flux. The activity in this `pre-flash' phase is investigated using 3.5 to 461 keV X-ray data from the Solar Maximum Mission, 100 to 1000 MHz radio data from Zurich, and 169 MHz radio-heliograph data from Nancay. The major results of this study are as follows: (1) Decimetric pulsations, interpreted as plasma emission at densities of 109-lO10 cm-3, and soft X-rays are observed before any Hα or hard X-ray increase. (2) Some of the metric type III radio bursts appear close in time to hard X-ray peaks but delayed between 0.5 and 1.5 s, with the shorter delays for the bursts with the higher starting frequencies. (3) The starting frequencies of these type III bursts appear to correlate with the electron temperatures derived from isothermal fits to the hard X-ray spectra. Such a correlation is expected if the particles are released at a constant altitude with an evolving electron distribution. In addition to this effect we find evidence for a downward motion of the acceleration site at the onset of the flash phase. (4) In some cases the earlier type III bursts occurred at a different location, far from the main position during the flash phase. (5) The flash phase is characterized by higher hard X-ray temperatures, more rapid increase in X-ray flux, and higher starting frequency of the coincident type III bursts.

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