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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 31, issue 1 | Copyright
Ann. Geophys., 31, 31-38, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 04 Jan 2013

Regular paper | 04 Jan 2013

A linear model for amplitude modulation of Langmuir waves in weak electron-beam plasma interaction

K. Baumgärtel K. Baumgärtel
  • Leibniz-Institut für Astrophysik Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany

Abstract. A simple linear approach to the phenomenon of amplitude modulation of Langmuir waves in weak beam plasma interaction is presented. During the short growth phase of the instability and within the longer period after saturation, the waves are described by their linear kinetic dispersion properties.The amplitude modulation appears as result of the beating of waves with different wavelengths and amplitudes that have grown from noise in the initial phase. The Langmuir wave fields are calculated via FFT (fast Fourier transform) technique. The resulting waveforms in temporal representation are quite similar to those observed by spacecraft.

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