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Astron. Astrophys. 331, L21-L24 (1998)

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Letter to the Editor

Nonlinear generation of type III solar radio bursts
by the hybrid modulational instability

J.R. Abalde , M.V. Alves and A.C.-L. Chian

National Institute for Space Research - INPE, P.O. Box 515, 12201-970 São José dos Campos - SP, Brazil

Received 28 October 1997 / Accepted 7 November 1997


An improved model of the fundamental plasma emission of type III solar radio bursts is presented. It is shown that nonlinear conversion of a traveling Langmuir pump wave into an electromagnetic wave can occur via either convective or absolute hybrid modulational instabilities, resulting from the coupling of two wave triplets, with the Langmuir pump wave and ion-acoustic daughter wave common to both wave triplets. The properties of these four-wave hybrid modulational instabilities are studied using the observed interplanetary parameters.

Key words: instabilities – plasma – Sun: radio radiation; solar wind

Send offprint requests to: J.R. Abalde (e-mail: abalde@dge.inpe.br)

© European Southern Observatory (ESO) 1998

Online publication: February 16, 1998