Abstract
An interpretation is suggested of the fine structure of tadpole solar radio emission based upon the theory of Bernstein mode cyclotron instability. It is shown that the frequency spectrum of an individual tadpole is similar to the frequency behaviour of the Bernstein mode increment if the velocity of electrons trapped by the magnetic field amounts nearly to 109 cm s-1. The absorption ‘body’ and emission ‘tail’ are associated with the instability due to the kinematic Doppler effect and the ‘eye’ with the instability due to the velocity dependence of the electron mass. The observed radio emission is the result of nonlinear conversion (coalescence) of Bernstein modes at different frequencies into electromagnetic waves. The appearance of separate tadpoles (interrupted character of emission in time) is attributed to the pulse injection of nonequilibrium electrons into the trap. Estimations are presented for the expected dimensions of emission region and the hot electron density necessary for Bernstein mode excitation.
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Zheleznyakov, V.V., Zlotnik, E.Y. Cyclotron wave instability in the corona and origin of solar radio emission with fine structure. Sol Phys 44, 447–459 (1975). https://doi.org/10.1007/BF00153224
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DOI: https://doi.org/10.1007/BF00153224