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On the sign of frequency drift of energetic electron beam radio emission
It is shown that the positive frequency drift that is sometimes observed
in the high-frequency part of type III bursts can be explained by a decrease
in the signal group delay as the emission source moves in the direction
of decreasing density. This effect is determined fundamentally by the velocity
of the emission source (electron beam) and by the density distribution
along the propagation path of electromagnetic waves. It is considered the
influence of magnetic field on the group delay.
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