Physics – Plasma Physics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..381l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 381-412.
Physics
Plasma Physics
24
Magnetohydrodynamic Flow, Plasma Physics, Shock Waves, Solar Corona, Stellar Envelopes, Stellar Mass Ejection, Density Distribution, Differential Equations, Gas Dynamics, Gas Expansion, Mach Number
Scientific paper
A set of spherically symmetric, time-dependent self-similar gasdynamic flows is presented. A polytropic gas with γ = 4/3 is assumed, and a 1/r2 gravity is present. Explicit analytic solutions are presented to illustrate the expansion of an atmosphere into vacuum as well as into an ambient atmosphere. In the latter example, the outflow is separated from the undisturbed ambient atmosphere by a strong gasdynamic shock. Among the nonlinear properties illustrated are the acceleration and deceleration of a shock in an extended atmosphere and the acceleration of the outer layers of the atmosphere to high speeds by the shock.
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