太阳风中磁场与等离子体流耦合的探讨

本文在忽略太阳风中磁场对粒子流温度影响的情况下,利用了两个研究太阳风的二元流体模型的结果,计算分析并讨论了在1AU内太阳赤道面附近,考虑磁场与等离子体流耦合后,各太阳风参数的变化情况。结果表明,太阳风中磁场对等离子休流的作用在方位角向较显著;磁场使太阳风方位角速度在1AU处的值可达到1.85km/s;低速太阳风的角动量主要由其中的磁场携带,磁场能逐步将其角动量传输给等离子体流。

ON COUPLING BETWEEN MAGNETIC FIELD AND PLASMA FLOW IN THE SOLAR WIND

A steady state model of the solar wind flow in the equatorial plane is sloved for both the radial and azimuthal motions for the case of neglecting the effect of magnetic field on the particles temperatures in solar wind, making use of the results of two known two-fluid solar wind models. The main features of the results are: The effect of magnetic field on the radial motion of the plasma flow is almost negligible, while in azimuthal direction quite the reverse is the case. At 1 AU this model has azimuthal velocity of 1.85 km/s. The upper limit of azimuthal velocity is about 6 km/s in radial Alfven point. The magnetic field line is twisted to a spiral line, the angle between the line and solar radial direction at 1 AU being about 55 degrees. The main part of the angular momentum of the solar wind is carried by the magnetic field, and transported to the plasma flow gradually.