Abstract
It is demonstrated by a numerical simulation that both the whistler waves and plasma waves are excited by a common solar electron beam. The excitation of the whistler waves is ascribed to the loss-cone distribution which arises at a later phase of the passage of the beam at a given height due to a velocity dispersion in the electron beam with a finite length. It is highly probable that the fundamental of type III bursts are caused by the coalescence of the whistler waves and the plasma waves excited by a common electron beam, although the plasma waves must suffer induce scatterings by thermal ions to have small wave numbers before the coalescence to occur.
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Takakura, T. Fundamental wave of type III solar radio bursts and whistler waves. Sol Phys 75, 277–292 (1982). https://doi.org/10.1007/BF00153477
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DOI: https://doi.org/10.1007/BF00153477