The high-frequency characteristics of solar radio bursts

Details The high-frequency characteristics of solar radio bursts The high-frequency characteristics of solar radio bursts

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..140..343l&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 140, no. 2, Aug. 1992, p. 343-368.

Physics

26

Millimeter Waves, Radio Emission, Solar Flares, Solar Radio Bursts, Bremsstrahlung, Energy Distribution, Energy Spectra, High Frequencies, Spatial Resolution

Scientific paper

The millimeter, microwave, and soft X-ray emission from a number of solar flares is compared in order to determine the properties of the HF radio emission of flares. The millimeter observations use a sensitive interferometer at 86 GHz which offers much better sensitivity and spatial resolution than most previous high-frequency observations. The 86-GHz emission onset appears often to be delayed with respect to the microwave onset. Even in large flares the millimeter-wavelength emission can arise in sources of only a few arc sec dimension. The millimeter emission in the impulsive phase does not correlate with the soft X-ray emission, and thus is unlikely to contain any significant thermal bremsstrahlung component. The electron energy distributions implied by the millimeter observations are much flatter (spectral indices of 2.5 to 3.6) than is usual for microwave or hard X-ray observations.

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