Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jbaa...87...51t&link_type=abstract
British Astronomical Association, Journal, vol. 87, Dec. 1976, p. 51-56.
Astronomy and Astrophysics
Astronomy
Magnetohydrodynamic Stability, Radiant Flux Density, Solar Activity Effects, Solar Corona, Solar Radio Bursts, Chromosphere, High Energy Electrons, Optical Thickness, Plasma Radiation, Plasma-Particle Interactions, Solar Storms
Scientific paper
A large collection of regular solar radio measurements conducted over 11 years at six observing frequencies is used to derive models for the rates of occurrence of type I and type IV events at discrete observing frequencies. Variations of the occurrence distribution parameter with frequency are examined, and it is found that normalized flux-density values have an exponential distribution. A linear relation between distribution parameter and frequency is obtained for frequencies above 120 MHz. The observed deviation from this relation below 120 MHz is attributed to the possibility that type I and type IV emissive centers are no longer optically thick below about 100 MHz. Two typical examples of oscillatory bursts recorded at 136 MHz are discussed, and it is suggested that these bursts could be caused by the same mechanism responsible for type III events; i.e., excitation of coronal plasma by jets of high-energy electrons produced in the lower corona or the chromosphere. The origin of the high-energy electrons is considered.
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