Physics
Scientific paper
Dec 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990knft....6...27c&link_type=abstract
Kinematika Fiz. Nebesn. Tel, Tom 6, No. 6, p. 27 - 34
Physics
Solar Radio Bursts, Solar Radio Radiation: Radiation Mechanisms, Solar Radio Radiation: Solar Corona
Scientific paper
The group delay of meter radio waves in the corona has been calculated for longitudinal propagation in terms of the plasma mechanism. Dynamical spectra for different electron beam parameters are drawn. For electron velocities V ⪆ 3·109cm/s in the source with dimensions ΔP ⪆ 109cm, the group delay at high frequencies (in the instantaneous burst band) dominates, which results in the positive frequency drift about 300 MHz/s. The negative frequency drift (df/dt ≍ -600 MHz/s) arises only at small particle velocities V ≍ 1.2·109cm/s when the low frequency emission is delayed owing to the reduction of group velocity near exit levels of ordinary and extraordinary waves. At small velocities two interesting phenomena are also observed: a change in the frequency drift direction and a mode splitting with positive or negative frequency drift.
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