EDP Sciences
Free access
Volume 401, Number 3, April III 2003
Page(s) 849 - 850
Section Cosmology
DOI http://dx.doi.org/10.1051/0004-6361:20030189

A&A 401, 849-850 (2003)
DOI: 10.1051/0004-6361:20030189

Research Note Dust Alfvén envelope solitons in astrophysical dusty plasmas

P. K. Shukla1 and F. Verheest2

1  Institut für Theoretische Physik IV, Ruhr-Universität Bochum, 44780 Bochum, Germany
2  Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, 9000 Gent, Belgium

(Received 5 December 2002 / Accepted 13 February 2003)

It is shown that nonlinear dynamics of modulated dust Alfvén wave packets is governed by a derivative nonlinear Schrödinger equation. The latter admits localized envelope solitons whose width  L is larger than $V_{\rm A}/\Omega_{\rm d}$, where $V_{\rm A}$ is the dust Alfvén speed and $\Omega_{\rm d}$ the dust gyrofrequency. For dusty plasma parameters relevant to molecular clouds in interstellar space, the soliton width is of the order of a fraction of a parsec.

Key words: plasmas -- waves -- ISM: clouds

Offprint request: P. K. Shukla, ps@tp4.ruhr-uni-bochum.de

© ESO 2003