Electromagnetic expulsion force in cosmic plasma

Details Electromagnetic expulsion force in cosmic plasma Electromagnetic expulsion force in cosmic plasma

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...287l..37l&link_type=abstract

Astronomy and Astrophysics 287L, L37-L40 (1994)

Astronomy and Astrophysics

Astrophysics

1

Mhd, Sun: Magnetic Fields, Sun: Prominences

Scientific paper

Electromagnetic expulsion acts on a body submerged in a conducting fluid traversed by an electric current and a magnetic field (provided the Lorentz force in the vincinity of the body is not zero). The effect results from the differences of electric conductivities inside and outside the body and is the MHD counterpart of the Archimedeam force. In this paper the dimensionality consideration and energy analysis are used to determine the expulsion force in the case of large magnetic Reynolds numbers, that is important for astrophysical applications. The consequences of electromagnetic expulsion are shown to be observable in solar prominences; here it can balance the gravity and can generate fast vortex flows inside them and in their conductivity. Possible observational tests of the effect are discussed.

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