Effect of cross-field flow on inertial Alfven waves of small transverse scale

Citation
T. Drozdenko et Gj. Morales, Effect of cross-field flow on inertial Alfven waves of small transverse scale, PHYS PLASMA, 8(7), 2001, pp. 3177-3182
Citations number
18
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICS OF PLASMAS
ISSN journal
1070-664X → ACNP
Volume
8
Issue
7
Year of publication
2001
Pages
3177 - 3182
Database
ISI
SICI code
1070-664X(200107)8:7<3177:EOCFOI>2.0.ZU;2-O
Abstract
This analytic study examines the effect of cross-field flow on a microscopi c current channel. To illustrate the subtle interplay between finite electr on inertia and flows, a simple model of excitation of a microscopic current channel is considered. The model consists of a slab antenna exciter with a transverse width on the order of the electron skin-depth driven at a singl e frequency. The antenna is fixed in the laboratory frame and embedded with in a plasma that has a uniform drift across the confining magnetic field. T he combined effects of the plasma flow and the intrinsic, collisionless, cr oss-field expansion of the current channel lead to standing wave structures across the confining magnetic field. The resulting parallel electric field s generate an array of current filaments of alternating polarity which indi vidually have transverse width smaller than the original channel. These res ults may help interpret laboratory and spacecraft measurements of Alfvenic turbulence and could lead to the development of a diagnostic tool to map pl asma flows. (C) 2001 American Institute of Physics.