Evolution of diamagnetic material in a nonuniform magnetic field

Details Evolution of diamagnetic material in a nonuniform magnetic field Evolution of diamagnetic material in a nonuniform magnetic field

Jan 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...288..653p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 288, Jan. 15, 1985, p. 653-664.

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Diamagnetism, Nonuniform Magnetic Fields, Stellar Atmospheres, Stellar Magnetic Fields, Gas Pressure, Magnetohydrodynamics, Temporal Distribution

Scientific paper

The dynamics and energetics of a diamagnetic body injected into a stellar atmosphere with an ambient, outwardly diverging magnetic field are investigated theoretically. The virial tensor theorem of Parker (1954) is used to formulate the problem with respect to the combined effects of the following forces of the nonuniform magnetic field: a magnetic field gradient which forces the body into regions of weaker field strength (the melon seed effect); and the lateral forces which compress the body while internal forces exert expansive pressures. It is found through a series of calculations that: (1) if the body is initially in equilibrium with its surroundings, it is ejected away from the stellar surface, while maintaining its instantaneous equilibrium; and (2) if the body possesses an internal magnetic field but is initially out of equilibrium it will oscillate around the equilibrium, while the center of the mass moves outward at a rate proportional to its average shape. Some potential applications of the theoretical results to the study of other stellar atmospheric phenomena are discussed.

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