Model interpretation of type III radio burst characteristics. II - Temporal aspects

Details Model interpretation of type III radio burst characteristics. II - Temporal aspects Model interpretation of type III radio burst characteristics. II - Temporal aspects

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...217..251r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 217, no. 1-2, June 1989, p. 251-269.

Astronomy and Astrophysics

Astrophysics

22

Solar Corona, Solar Magnetic Field, Type 3 Bursts, Azimuth, Flux Density, Interplanetary Magnetic Fields, Plasma Density

Scientific paper

A model of the radio emission region for kilometric type II bursts is used to interpret systematic variations observed in the temporal behavior of the burst parameters. The temporal behavior of the burst parameters observed by the ISEE-3 spacecraft is reviewed, and it is pointed out that the phase and modulation of the antenna signal vary in a systematic way with both time and observing frequency. The source azimuth is observed to drift with time, with the magnitude and sense of the drift depending on the location of the radio source relative to the observer. The modulation factor usually decreases uniformly with time and is frequently peaked near the burst onset. The model of the radio emission region is developed and used to obtain the intensity, phase, and modulation of the radio signal. Model results are used to show how the behavior of the burst parameters are related to attributes of the source region. It is shown that the temporal behavior of the radio parameters for an observed type II burst is well represented by the model.

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