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The Solar Wind – an Example of a Cosmical Plasma and a Stellar Wind

Published online by Cambridge University Press:  14 August 2015

R. Lüst
R. Lüst*
Affiliation:
Max-Planck-Institut für Physik und Astrophysik, Institut für extraterrestrische Physik, Garching/München, Germany

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When Parker developed the theory of the solar wind, he suggested that other stars might also be surrounded by an expanding atmosphere. This suggestion has been worked out by Deutsch (1958, 1960, 1961, 1969) and by Weymann (1960, 1963), who discussed coronal evaporation as a possible mechanism for mass loss in red giants and used hydrodynamical equations for describing the phenomena. During the last few years detailed observations of the solar wind have been made, and the theoretical approach has also been further developed. Both might help us in our understanding of problems of a quasi-stationary mass loss of stars. But besides its relevance for the study of other stellar winds, the solar wind is important, as it is the best observed cosmical plasma available for guidance in the study of other cosmical, collisionless plasmas. What makes the interplanetary plasma so important is that beyond several solar radii from the Sun there are no collisions among the gas particles (one solar radius [R⊙] is 7.0 × 1010 cm; 1 AU is 215 R⊙). Only near the Sun the collision rate is sufficiently high to maintain isotropy of the thermal particle motions and to produce ordinary fluid behavior. At larger distances from the Sun the fluid behavior is maintained by irregularities in weak magnetic fields and by micro-instabilities in the plasma.

Type
Part II: Interaction of Stars and Interstellar Medium
Information
Symposium - International Astronomical Union , Volume 39: Interstellar Gas Dynamics , 1970 , pp. 249 - 262
Copyright
Copyright © Reidel 1970 

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