Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108..161b&link_type=abstract
Astronomy and Astrophysics, vol. 108, no. 1, Apr. 1982, p. 161-168.
Astronomy and Astrophysics
Astrophysics
12
Type 3 Bursts, Electron Beams, Polarized Electromagnetic Radiation, Propagation Modes, Spectroheliographs
Scientific paper
Simultaneous observations of groups of metric type III radio bursts at high spectral, spatial, and temporal resolution are presented. They have occurred on different days and above the photospheric limb. It is found that they tend to be clustered in pairs. The two bursts in each pair have considerably different properties. The primary bursts have generally higher frequency drifts, stronger polarization, higher starting frequency, smaller size, and sometimes larger distance from the center of the sun. The hypothesis of fundamental and harmonic emission encounters serious difficulties. The observations fit better with electron beams propagating along two different (primary and secondary) paths. This suggests a model where the secondary beam originates from electrons with a different acceleration region being triggered by the first energy release and having a smaller energy input and thus smaller beam velocity.
Benz Arnold O.
Mangeney Andre
Pick Monique
Raoult Annie
Treumann Rudolf
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