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Kinetic modulational instability of broadband dispersive Alfvén waves in plasmas

Published online by Cambridge University Press:  01 April 2007

P.K. SHUKLA ,
NITIN SHUKLA  and
L. STENFLO
P.K. SHUKLA
Affiliation:
Institut für Theoretische Physik IV and Centre for Plasma Science and Astrophysics, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany (ps@tp4.rub.de, ns@tp4.rub.de) Max-Planck Institut für extraterrestrische Physik, D-45741 Garching, Germany CCLRC Centre for Fundamental Physics, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, UK SUPA Department of Physics, University of Strathclyde, Glasgow G4 ONG, UK GoLP/Centro de Fíi sica de Plasmas, Instituto Superior Técnico, 1096 Lisboa Codex, Portugal
NITIN SHUKLA
Affiliation:
Institut für Theoretische Physik IV and Centre for Plasma Science and Astrophysics, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany (ps@tp4.rub.de, ns@tp4.rub.de) Department of Physics, K. N. Government Postgraduate College, Gyanpur, Bhadohi 221304, U.P., India
L. STENFLO
Affiliation:
Institut für Theoretische Physik IV and Centre for Plasma Science and Astrophysics, Fakultät für Physik und Astronomie, Ruhr-Universität Bochum, D-44780 Bochum, Germany (ps@tp4.rub.de, ns@tp4.rub.de) Department of Physics, Umeå University, SE-90187 Umeå, Sweden (lennart.stenflo@physics.umu.se)
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Abstract.

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We consider a kinetic modulational instability of broadband (random phase) magnetic-field-aligned circularly polarized dispersive Alfvén waves in plasmas. By treating random phase Alfvén waves as quasi-particles, we consider their nonlinear interactions with ion quasi-modes within the framework of the wave-kinetic and Vlasov descriptions. A nonlinear dispersion relation governing such interactions is derived and analyzed. An explicit expression for the kinetic modulational instability growth rate is presented. Our results can be of relevance to the nonlinear propagation of incoherent Alfvén waves, which have been frequently observed in interstellar media, in the solar corona and in the solar wind, as well as in the foreshock regions of planetary bow-shocks and laboratory plasmas.

Type
Letter to the Editor
Information
Journal of Plasma Physics , Volume 73 , Issue 2 , April 2007 , pp. 153 - 157
Copyright
Copyright © Cambridge University Press 2006

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