| 太阳风湍流和磁层亚暴的一种机制 |
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| 引用本文： | 胡文瑞.太阳风湍流和磁层亚暴的一种机制[J].地球物理学报,1980,23(3):245-253. |
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| 作者姓名： | 胡文瑞 |
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| 作者单位： | 中国科学院力学研究所 |
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| 摘 要： | 太阳风的动量涨落将通过磁层边界在磁尾激发磁流体力学波。快磁声波携带扰动能量传到等离子体片中,发展为激波,或者通过激波的相互作用而耗散能量,使等离子体加热。等离子体片中的随机费米加速机制,使麦克斯韦分布尾巴部分的高能量粒子被加速到更高能。在宁静态时,加热、加速与耗散过程平衡。当太阳风的动量或者其涨落较大时,整个加热和加速过程加剧,更多的高能粒子产生,并从等离子体片中逃逸,形成高速的等离子体流注入近地轨道和极区,表现为磁层亚暴过程。利用这种机制,可以解释地球磁层亚暴的定性特征。
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| 关 键 词： | 等离子体片 磁层亚暴 太阳风湍流 磁层尾 激波 快磁声波 磁尾 涨落 高能粒子注入 动能 |
| 收稿时间： | 1978-12-12 |
MECHANISM OF MAGNETOSPHERIC SUBSTORM AND THE TURBULENCE OF SOLAR WIND |
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| Hu Wen-rul.MECHANISM OF MAGNETOSPHERIC SUBSTORM AND THE TURBULENCE OF SOLAR WIND[J].Chinese Journal of Geophysics,1980,23(3):245-253. |
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| Authors: | Hu Wen-rul |
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| Institution: | Institute of Mechanics, Academia Sinica |
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| Abstract: | The magnetohydrodynamic waves can be excited in the magnetotail by the momen-tum fluctuation of solar wind through the magnetopause. The fast magnetohydrody-namic waves thus excited penetrate into the plasma sheet and develope to form the shock waves. The energy of these waves is converted into heat by dissipation or by inter-collisions of the shock waves, and during these processes, the plasma is heated. The energetic particles in the tail part of the Maxwellian distribution are then accelerated to a higher energy by the stochastic Fermi mechanism in the plasma sheet. In the quiet state, the equilibrium among the processes of dissipation, plasma heating, particle acceleration and escape is reached. Both heating and accelerating processes are strengthened by the condition that the momentum of the solar wind or it's fluctua-tion is increased greatly. A great number of energetic particles must escape from the plasma sheet, and they will form a plasma stream with high speed, which manifests it-self as the magnetosubstorm in the magnetcsphere. |
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