The role of metric and decimetric radio emission in the understanding of solar flares

Details The role of metric and decimetric radio emission in the understanding of solar flares The role of metric and decimetric radio emission in the understanding of solar flares

Sep 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...165..227s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 165, no. 1-2, Sept. 1986, p. 227-234.

Astronomy and Astrophysics

Astrophysics

30

Decimeter Waves, Electron Beams, Solar Electrons, Solar Flares, Type 3 Bursts, Chromosphere, Energy Transfer, Radiative Transfer, Solar X-Rays

Scientific paper

The metric and decimetric radio emission from large X-ray and gamma ray flares are examined with the aim of clarifying the role of electron beams in the primary energy transfer process during the impulsive phase of solar flares. It is found that a significant fraction, ≡15%, of the flares have no detectable radio emission at these wavelengths at current levels of instrument sensitivity. In addition, for the gamma ray flares a further 43% had the start of type III burst activity delayed by 60 s or more from the onset of the hard X-ray burst. The production and propagation of type III radiation is briefly reviewed and it is concluded that modern ground-based radio telescopes should be sensitive to a beam of electrons containing ⪆1029electrons above 20 keV. It is concluded that in the type III-quiet flares there is evidence against such beams. A consequence of this conclusion is that non-thermal electron beams cannot be the dominant energy transfer mechanism during the impulsive phase in at least some flares.

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