Physics
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phla..316..238s&link_type=abstract
Physics Letters A, Volume 316, Issue 3-4, p. 238-242.
Physics
11
Scientific paper
It is known that the presence of stationary charged dust grains produces rotational ion motion due to the J×B force in a uniform dusty magnetoplasma, where J is the plasma current density and B is the magnetic field. Our objective here is to show the possibility of a new low-frequency electromagnetic mode in a nonuniform dusty magnetoplasma. The nonlinear dynamics of newly found electromagnetic mode is governed by a Charney-Hasegawa-Mima (C-HM) equation. Possible stationary solutions of the latter can be represented in the form of a vortex street and a dipolar vortex. The present results should help to understand the origin of large scale coherent vortex structures that are frequently observed in astrophysical objects (e.g., in molecular clouds) and in galaxies. Besides, new laboratory experiments should be conducted for verifying the linear and nonlinear properties of the low-frequency electromagnetic wave that is reported herein.
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