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Interaction between a dust cloud and a magnetized plasma in relative motion
KTH, Superseded Departments, Alfvén Laboratory.
2001 (English)In: IEEE Transactions on Plasma Science, ISSN 0093-3813, E-ISSN 1939-9375, Vol. 29, no 2, 302-306 p.Article in journal (Refereed) Published
Abstract [en]

The interaction between a dust cloud and a magnetized plasma is investigated by use of an idealized model where the dust particles have uniform size, a uniform density within the dust cloud, and start with the same velocity across the magnetic field in the plasma's rest frame. The interaction is found to be governed by a dimensionless parameter K which is a function of dust cloud, and ambient plasma, parameters. For K much smaller than unity, the interaction goes on for typically 1/(2 piK) gyro times, with the particles in the dust cloud performing gyro motions with decreasing radius, For K close to unity, the dust motion is stopped on the order of a dust particle gyro time, For the case K much greater than 1, the plasma in the flux tube through the dust cloud is dragged across the magnetic field over a distance of the order of Kr-d, where r(d) is the dust gyro radius, before the motion is stopped. Some expected effects for a more realistic dust cloud with density gradients, and containing dust with a spread in size, are discussed. The results have bearing on dusty plasma in space, e.g., models of the formation of spokes in Saturn's ring system.

Place, publisher, year, edition, pages
2001. Vol. 29, no 2, 302-306 p.
Keyword [en]
dust cloud motion, dust-plasma momentum exchange, dusty plasmas, Saturnian spokes, crit-ii
URN: urn:nbn:se:kth:diva-20624DOI: 10.1109/27.923713ISI: 000168661800032OAI: diva2:339320
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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