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Dynamic trapping and skidding of dense plasma clouds
KTH, Superseded Departments, Alfvén Laboratory.
KTH, Superseded Departments, Alfvén Laboratory.
2004 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 70, no 03-feb, 153-156 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the possibility that the mechanism dynamic trapping can play a role in decoupling dense plasma clouds injected in a thinner ambient plasma, by establishing strong magnetic-field-aligned electric fields in the vicinity or in the edge of the cloud. Dynamic trapping has previously been shown to allow such fields to be established and maintained on the time scale of ion motion, also for arbitrarily low current densities. A model is presented of how such fields could arise and decouple injected plasma clouds, a mechanism which we call dynamic decoupling. A dimensionless parameter. the dynamic decoupling factor F-DD, is derived which gives an estimate of the importance of the process. One possible application is the CRRES ionospheric injection experiments where anomalous skidding has recently been reported. However. the dynamic decoupling mechanism might also play a role in naturally occurring situations, e.g. the impulsive penetration of plasmoids from the solar wind into the Earth's magnetosphere.

Place, publisher, year, edition, pages
2004. Vol. 70, no 03-feb, 153-156 p.
Keyword [en]
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-23696DOI: 10.1088/0031-8949/70/2-3/012ISI: 000223637900012ScopusID: 2-s2.0-4043102634OAI: diva2:342395
QC 20100525 QC 20110926Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2011-09-26Bibliographically approved

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Brenning, NilsFälthammar, Carl-Gunne
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