Correlation of solar decimetric radio bursts with X-ray flares

Details Correlation of solar decimetric radio bursts with X-ray flares Correlation of solar decimetric radio bursts with X-ray flares

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...97..159a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 97, May 1985, p. 159-172.

Physics

30

Decimeter Waves, Plasma Frequencies, Plasma Turbulence, Solar Flares, Solar Radio Bursts, Solar X-Rays, Bandwidth, Correlation

Scientific paper

Several hundred radio bursts in the decimetric wavelength range (300-1000 MHz) have been compared with simultaneous soft and hard X-ray (HXR) emission. Long lasting (type IV) radio events have been excluded. The association of decimetric emission with hard X-rays has been found to be surprisingly high (48 percent). The association rate increases with bandwidth, duration, number of structural elements, and maximum frequency. Type III-like bursts are observed up to the upper limit of the observed band. This demonstrates that the corona is transparent up to densities of about 10 to the 10th/cu cm, contrary to previous assumptions. This can only be explained in an inhomogeneous corona with the radio source being located in a dense structure. The short decimetric bursts generally occur during the impulsive phase, i.e., simultaneously with hard X-rays. The times of maximum flux are well correlated (within 2 s). The HXR emission lasts 4 times longer than the radio emission in the average. This work finds a close relationship between decimetric and HXR emission, with sufficient statistics offering additional information on the flare process.

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