Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...132..229m&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 132, no. 1, March 1984, p. 229-235.
Astronomy and Astrophysics
Astrophysics
1
Microwave Spectra, Solar Flares, Solar X-Rays, Absorptivity, Energy Dissipation, High Energy Electrons, Ion Acoustic Waves
Scientific paper
The very close temporal correlation of hard X-ray and microwave emission from solar flares implies a common origin for radiation at these wavelengths. Here, an analysis is conducted of the spectral characteristics of microwave emission from a 'multiple kernel' type of hard X-ray model, where several impulsively heated hot sources are bounded by conduction fronts and expand at the ion-sound speed. The properties of a single kernel are considered first; these are found to be compatible in intensity with observations, but to be limited in their compatibility with spectra. Extension of the model to include a spread in kernel parameters (in particular to high temperatures) is shown to be successful in explaining high frequency spectral indices, but lower frequencies require some additional effect, such as time varying magnetic field. It is concluded that microwave observations do not rule out the multiple kernel thermal model.
Brown John C.
MacKinnon Alexander L.
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