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A theory of the fundamental plasma emission of type-III solar radio bursts

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A theory of the fundamental plasma emission of type-III solar radio bursts

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Título A theory of the fundamental plasma emission of type-III solar radio bursts
Autor Alves, Maria Virginia
Chian, Abraham Chian-Long
Moraes, Márcio A.E. de
Abalde, José Ricardo G.
Rizzato, Felipe Barbedo
Abstract Results from plasma wave experiments in spacecraft give support to nonlinear interactions involving Langmuir waves, electromagnetic waves and ion-acoustic waves in association with type III solar radio bursts. In this paper we present a theory of the fundamental plasma emission of type-III solar radio bursts. Starting from the generalized Zakharov equations, considering the pump wave as a pair of oppositely propagating Langmuir waves with di erent amplitudes, and the excitation of electromagnetic and induced Langmuir waves, we obtain a general dispersion relation for the coupled waves. We numerically solve the general dispersion relation using the pump wave amplitude and plasma parameters as observed in the interplanetary medium.We compare our results with previous models. We find that the stability properties depend on the pump wave numbers and on the ratio of wave amplitude between the forward and backward pump wave. The inclusion of a second pump wave allows the simultaneous generation of up and down converted electromagnetic waves. The presence of a second pump with di erent amplitude from the first one brings a region of convective instability not present when amplitudes are the same.
Contido em Astronomy and astrophysics. Les Ulis. Vol. 390, no. 1 (July 2002), p. 351-357
Assunto Radiação solar em radio-frequência
Teoria de plasmas
[en] Instabilities
[en] Plasmas
[en] Radio radiation
[en] Solar wind
[en] Waves
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/98552
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