Abstract
view Abstract Citations (17) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Evolution of diamagnetic material in a nonuniform magnetic field Pneuman, G. W. ; Cargill, P. J. Abstract 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. Publication: The Astrophysical Journal Pub Date: January 1985 DOI: 10.1086/162831 Bibcode: 1985ApJ...288..653P Keywords: Diamagnetism; Nonuniform Magnetic Fields; Stellar Atmospheres; Stellar Magnetic Fields; Gas Pressure; Magnetohydrodynamics; Temporal Distribution; Astrophysics full text sources ADS |
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