TWO-DIMENSIONAL MAGNETOHYDRODYNAMIC EQUILIBRIA IN THE SOLAR CORONA (II)
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摘要: 基于解析和数值相结合的方法,进一步讨论了非均匀引力场中日冕的二维磁流体动力学平衡。对临界点进行了比较仔细的处理。得到了包含闭场区、中性片和开场区的大尺度日冕磁场位形,闭场区和中性片构成冕流结构。在高纬和低纬地区几个太阳半径之外,等离子体径向流动速度超过了局地声速和局地Alfvén速度。在1AU处,太阳风速度可达到400kms-1以上Abstract: Based on a combination of analytical and numerical methods,two-dimensional magneto-hydrodynamic equilibria in the non-uniform gravitational field for the solar corona are discussed.The critical points are carefully treated.The large-scale magnetic structures of corona,which include the closed-field region,the neutral sheet and the open-field region,are obtained.The closed-field region and the neutral sheet constitute a coronal streamer.On the high-and low-latitudes,the radial flow velocity of plasma exceeds the local sound and local Alfvenic velocities beyond several solar radii.The velocity of solar wind reaches 400 km/s at 1 AU.
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Key words:
- Corona /
- Magnetohydrodyn mics /
- Solar wind
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