Expanding force-free magnetized plasmoid

Details Expanding force-free magnetized plasmoid Expanding force-free magnetized plasmoid

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348l..73y&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 348, Jan. 10, 1990, p. L73-L76.

Astronomy and Astrophysics

Astronomy

8

Force-Free Magnetic Fields, Magnetic Clouds, Magnetohydrodynamic Flow, Radio Jets (Astronomy), Solar Magnetic Field, Interplanetary Magnetic Fields, Solar Wind

Scientific paper

Some properties of a plasmoid in which magnetic field dominates are discussed. Linear expansion, which have been proposed, provides a simple model describing slow and topologically self-similar expansion of a low-beta plasmoid. An initially force-free magnetized plasmoid expanding linearly may evolve toward consecutive force-free states. The magnetic field energy of such an expansion is studied by applying the virial equation. The result indicates that the decrease of the magnetic energy of the plasmoid is exactly equal to work done expelling its external pressure. This means that there is no residue of magnetic energy if a force-free magnetized plasmoid expands linearly.

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