Solar wind speed theory and the nonextensivity of solar corona

Details Solar wind speed theory and the nonextensivity of solar corona Solar wind speed theory and the nonextensivity of solar corona

2008-02-15

arxiv.org/abs/0802.2170v1

Astrophysics and Space Science Proceedings,P.93-102(Springer-Verlag, Berlin Heidelberg, 2010)

Astronomy and Astrophysics

Astrophysics

12 pages,1 figure, 1 table, 21 references; UN/ESA/NASA Workshop on Basic Space Science and the International Heliophysical Yea

Scientific paper

10.1007/978-3-642-03325-4_10

The solar corona is a complex system, with nonisothermal plasma and being in the self-gravitating field of the Sun. So the corona plasma is not only a nonequilibrium system but also a nonextensive one. We estimate the parameter of describing the degree of nonextensivity of the corona plasma and study the generalization of the solar wind speed theory in the framework of nonextensive statistical mechanics. It is found that, when use Chapman's corona model (1957) as the radial distribution of the temperature in the corona, the nonextensivity reduces the gas pressure outward and thus leads a significant deceleration effect on the radial speed of the solar wind.

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