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Conditions for plasmoid penetration across abrupt magnetic barriers
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
2005 (English)In: Physics of Plasmas, ISSN 1070-664X, Vol. 12, no 1Article in journal (Refereed) Published
Abstract [en]

The penetration of plasma clouds, or plasmoids, across abrupt magnetic barriers (of the scale less than a few ion gyro radii, using the plasmoid directed velocity) is studied. The insight gained earlier, from detailed experimental and computer simulation investigations of a case study, is generalized into other parameter regimes. It is concluded for what parameters a plasi-noid should be expected to penetrate the magnetic barrier through self-polarization, penetrate through magnetic expulsion, or be rejected from the barrier. The scaling parameters are n(e), upsilon(o), B-perpendicular to, m(i), T-i, and the width w of the plasmoid. The scaling is based on a model for strongly driven, nonlinear magnetic field diffusion into a plasma which is a generalization of the earlier laboratory findings. The results are applied to experiments earlier reported in the literature, and also to the proposed application of impulsive penetration of plasmoids from the solar wind into the Earth's magnetosphere.

Place, publisher, year, edition, pages
2005. Vol. 12, no 1
Keyword [en]
ion-beam transverse, field, propagation, simulations, instability
URN: urn:nbn:se:kth:diva-14517DOI: 10.1063/1.1812277ISI: 000226864500018ScopusID: 2-s2.0-20444444310OAI: diva2:332558
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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