| Issue |
A&A
Volume 401, Number 3, April III 2003
|
|
|---|---|---|
| Page(s) | 849 - 850 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361:20030189 | |
| Published online | 01 April 2003 | |
Research Note Dust Alfvén envelope solitons in astrophysical dusty plasmas
1
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, ps@tp4.ruhr-uni-bochum.de
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 
, 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
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