Research Note Dust Alfvén envelope solitons in astrophysical dusty plasmas
Institut für Theoretische Physik IV, Ruhr–Universität Bochum, 44780 Bochum, Germany
2 Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281, 9000 Gent, Belgium
Corresponding author: P. K. Shukla, email@example.com
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 , where VA is the dust Alfvén speed and 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
© ESO, 2003