Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..261m&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, May 15, 1977, p. 261-267.
Astronomy and Astrophysics
Astrophysics
19
Astronomical Models, Magnetic Stars, Magnetospheric Instability, Stellar Magnetospheres, Stellar Mass Accretion, X Ray Sources, Adiabatic Conditions, Buoyancy, Magnetic Dipoles, Neutron Stars, Plasma Pressure, Stellar Magnetic Fields
Scientific paper
The paper examines the local stability of a class of plasma exospheres above a magnetopause wherein the external plasma pressure varies as some inverse power of radial distance. Physically, this corresponds to the steady-state pressure variation to be expected if a gravitating object were placed in a cool gas cloud and adiabatically accumulated the gas above a nonabsorbing surface. Consideration is given to the question of whether the resultant axisymmetric magnetopause finds itself trying to support a plasma that cannot be buoyantly supported. Buoyancy in nonuniform vacuum magnetic fields is analyzed, the special case of a magnetosphere confined by plasma is investigated, and models are constructed for constant-pressure and adiabatic-pressure magnetopauses. The results suggest that an unstable magnetopause is stabilized by release of magnetic flux and that a stable sequence of magnetopauses exists for powers of radial distance greater than about 2.74 if some of the magnetic flux is not confined by the inner magnetopause surface.
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