Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...119..131c&link_type=abstract
Astronomy and Astrophysics, vol. 119, no. 1, Mar. 1983, p. 131-138. Research supported by the Financiadora de Estudos e Projeto
Astronomy and Astrophysics
Astrophysics
4
Magnetic Flux, Microwave Emission, Solar Magnetic Field, Solar Radio Bursts, Solar Spectra, Time Lag, Chromosphere, Microwave Spectra, Solar Corona, Solar Electrons, Synchrotron Radiation, Thermal Emission
Scientific paper
An explanation for the observed time-delay of high frequency emissions of solar bursts, relative to lower frequency signals, is sought by a study of the temporal variations of the parameters regulating the emissions' source. The discussion focuses on the emissivity enhancement by a growing magnetic field, which is distinct for each microwave emission frequency. An emitting source is assumed to be moving downwards in the corona/chromosphere, and the electrons are described by a thermal distribution. The emission frequencies are related to the height of the downmoving source in the solar atmosphere, and vary temporally with the magnetic field. The effects of the angle of emission relative to the observer are investigated, and shown to produce changes in thermal and nonthermal situations.
Costa Joaquim E. Rezende
Kaufmann Patrik
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