太阳风速度理论与日冕的不可扩展性
Solar wind speed theory and the nonextensivity of solar corona
摘要：
日冕是一个复杂系统，存在非等温等离子体，并处于太阳的自引力场中。因此，电晕等离子体不仅是一个非平衡系统，而且是一个非广延系统。在非广延统计力学的框架下，我们估计了描述日冕等离子体非广延程度的参数，并研究了太阳风速度理论的推广。结果表明，当用Chapman（1957）的日冕模型描述日冕内温度的径向分布时，非扩张性使气体压力向外减小，从而对太阳风的径向速度产生明显的减速作用。
英文摘要：
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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