Physics
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976soph...49..117m&link_type=abstract
Solar Physics, vol. 49, July 1976, p. 117-140. Research supported by the Swiss National Science Foundation.
Physics
9
Electron Radiation, Microwave Spectra, Solar Radio Bursts, Solar X-Rays, Stellar Models, Sunspots, Chromosphere, Electron Beams, Magnetic Moments, Magnetically Trapped Particles, Solar Atmosphere, Solar Corona
Scientific paper
The microwave spectrum of a continuous electron beam that is injected into the radial field lines of a sunspot is computed, and the results are compared with the thick-target X-rays produced by the same electrons when they impinge into the chromosphere. It is found that the electrons are not trapped if the magnetic-moment distribution limits that moment to small values and if the asymmetry of coronal magnetic fields is taken into account, that the lifetime of nonthermal electrons is limited to one bunching period, and that the magnetic moment is likely to be conserved in the corona because collisions can be neglected during this short time. Such conservation is shown to lead to an anticorrelation of the low-frequency (i.e., microwave) spectral index with the hard X-ray spectral index. A comparison of microwave spectra calculated for different values of some variable indicates that low-energy electrons (no more than 100 keV) contribute mainly to the low-frequency spectrum. Difficulties in computing high-frequency microwave spectra are discussed.
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