Model interpretation of type III radio burst characteristics. I - Spatial aspects

Details Model interpretation of type III radio burst characteristics. I - Spatial aspects Model interpretation of type III radio burst characteristics. I - Spatial aspects

Nov 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...206..316r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 206, no. 2, Nov. 1988, p. 316-335.

Astronomy and Astrophysics

Astrophysics

28

Interplanetary Magnetic Fields, Solar Radio Bursts, Type 3 Bursts, Electron Beams, Flux Density, Incident Radiation, Interplanetary Medium, Radiation Distribution, Solar Corona

Scientific paper

The ways that the finite size of the source region and directivity of the emitted radiation modify the observed characteristics of type III radio bursts as they propagate through the interplanetary medium are investigated. A simple model that simulates the radio source region is developed to provide insight into the spatial behavior of the parameters that characterize radio bursts. The model is used to demonstrate that observed radio azimuths are systematically displaced from the geometric centroid of the exciter electron beam in such a way as to cause trajectories of the radio bursts to track back to the observer at low frequencies, rather than to follow expected Archimedean spiral-like paths. The source region model is used to investigate the spatial behavior of the peak intensities of radio bursts, and it is found that the model can qualitatively account for both the frequency dependence and the east-west asymmetry of the observed peak flux densities.

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