Solar wind speed theory and the nonextensivity of solar corona

Abstract

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.

12 pages,1 figure, 1 table, 21 references; UN/ESA/NASA Workshop on Basic Space Science and the International Heliophysical Year 2007, National Astronomical Observatory of Japan, 18-22 June, 2007, Tokyo, Japan

References in corpus (5)

• Ion acoustic waves in the plasma with the power-law q-distribution in nonextensive statistics
• A nonextensive approach for the instability of current-driven ion-acoustic waves in space plasma
• Nonextensivity and the power-law distributions for the systems with self-gravitating long-range interactions
• Test of Nonextensive Statistical Mechanics by Solar Sound Speeds
• The Chandrasekhar condition of the equilibrium and stability for a star in the nonextensive kinetic theory

Cited by in corpus (6)

• Transport coefficients in Lorentz plasmas with the power-law kappa-distribution
• Dust-acoustic waves and stability in the permeating dusty plasma: II. Power-law distributions
• Transport coefficients of the fully ionized plasma with kappa-distribution and in strong magnetic field
• Slowing down of charged particles in dusty plasmas with pawer-law kappa-distributions
• Analytical predictions of non-Gaussian distribution parameters for stellar plasmas
• Hemispheric asymmetry in the sunspot cycle as a nonextensive phenomenon