Nonradial and nonpolytropic astrophysical outflows. II - Topology of MHD solutions with flaring streamlines

Details Nonradial and nonpolytropic astrophysical outflows. II - Topology of MHD solutions with flaring streamlines Nonradial and nonpolytropic astrophysical outflows. II - Topology of MHD solutions with flaring streamlines

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..790t&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 790-806.

Astronomy and Astrophysics

Astrophysics

16

Magnetohydrodynamic Flow, Plasma Jets, Stellar Winds, Topology, Coronal Holes, Critical Point, Gravitational Fields, Maxwell Equation, Solar Wind, Stream Functions (Fluids)

Scientific paper

The detailed dependence of the topology of a nonradial and nonpolytropic magnetized outflow from a gravitating central object on the degree of magnetization, density latitudinal inhomogeneity and deviations of the streamlines from radiality (flaring), is examined. The topology is governed by several novel saddle and nodal hydromagnetic critical points that select a characteristic wind-type outflow solution. This critical solution starts sub-Alfvenically at the base with flaring streamlines, becoming super-Alfvenic further downstream with the streamlines asymptotically radial. Other jet-type noncritical solutions also exist and correspond to the streamlines forming a nozzle above the base. The multiple hydromagnetic critical points and the involved nature of the topology that appear in this relatively simple analytical class of solutions are indicative of the complexity of the MHD wind-phenomenon; this fact may be taken into account in numerical modelling of magnetized nonradial outflows, such as in the hydromagnetic solar wind, or, other jet-type magnetized astrophysical flows.

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