Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...123...10b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 123, no. 1, June 1983, p. 10-16. Research supported by the Science and Enginee
Astronomy and Astrophysics
Astrophysics
10
Microwave Emission, Solar Magnetic Field, Solar Radio Bursts, Solar Spectra, Energy Dissipation, Time Lag
Scientific paper
The microwave emission properties are analysed for a plasma region heated by dissipation of magnetic energy. The rising temperature and falling magnetic field produce a variation in microwave optical depth which can introduce time delays in event features at different frequencies. However, for a single heated region the effect is always that of retardation of lower frequencies and, for plausible physical parameters, it is feasible to explain only events with small delays (a few seconds) and maximum peak frequency ⪉25 GHz. Intense events with long delays (⪆10 s) and high peak frequencies cannot be explained. The analysis is extended to the case where many such single annihilation regions of varying magnetic field strength, each of short lifetime, are produced continuously throughout the burst. This multiple kernel model is capable of producing either advancement or retardation of lower frequencies and also of explaining intense events with large delays.
Brown John C.
Kaufmann Patrik
MacKinnon Alexander L.
Zodi A. M.
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