Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....40..405k&link_type=abstract
Astronomy and Astrophysics, vol. 40, no. 4, May 1975, p. 405-410. Research supported by the Nederlandse Organisatie voor Zuiver
Astronomy and Astrophysics
Astrophysics
28
Continuous Radiation, Solar Corona, Solar Magnetic Field, Type 4 Bursts, Electrostatic Waves, Field Strength, Magnetohydrodynamic Waves, Time Response
Scientific paper
A unified mechanism is presented for the production of type IV dm continuum radiation and zebra-pattern microstructure. It is shown that both the continuum and zebra patterns can originate in plasma waves at the upper hybrid frequency which are excited by a loss-cone distribution of fast electrons superposed on the thermal background. The zebra patterns will result from the electrostatic instability at source-region surfaces with integer ratios of electron plasma frequency/electron cyclotron frequency provided that the fraction of fast particles is small and the frequency ratio is large. A continuum will be produced under opposite conditions or in the same way as the zebra patterns if the magnetic-field inhomogeneity makes the plasma frequency vary more than a value equal to the average electron cyclotron frequency along the different harmonic surfaces.
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