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Astron. Astrophys. 348, L13-L16 (1999)


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Letter to the Editor

A broadband theory of Langmuir-whistler events in the solar wind

Qinghuan Luo 1, Abraham C.-L. Chian 2,3 and Félix A. Borotto 2,3,4

1 Department of Physics and Mathematical Physics, University of Adelaide, SA 5005, Australia
2 CSSM, University of Adelaide, SA 5005, Australia
3 National Institute for Space Research (INPE), P.O. Box 515, 12201-970 São José dos Campos - SP, Brazil
4 Departamento de Fisica, Universidad de Concepción, Concepción, Chile

Received 7 June 1999 / Accepted 19 June 1999

Abstract

Recent interplanetary observations presented evidence of simultaneous excitation of high-frequency Langmuir waves and low-frequency electromagnetic whistler waves in the magnetic holes of the solar wind. In this letter, we formulate a broadband theory of the interplanetary Langmuir-whistler events. We show that whistler waves can grow exponentially as a result of nonlinear interactions of Langmuir waves and left-hand circularly polarized radio waves. In particular, the growth of whistler waves favors propagation parallel to the Langmuir waves.

Key words: plasmas – Sun: solar wind – turbulence

Present address: SRCfTA, School of Physics, University of Sydney, NSW 2006, Australia.

Send offprint requests to: Q. Luo (luo@physics.usyd.edu.au)

© European Southern Observatory (ESO) 1999

Online publication: July 16, 1999

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