The radial evolution of a single solar wind plasma parcel
The radial evolution of a single solar wind plasma parcel
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单个太阳风等离子体包裹的径向演化
DOI：
10.1029/ja088ia12p09919
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发表时间：
1983
影响因子：
--
通讯作者：
E. Marsch
中科院分区：
文献类型：
--
作者：
S. Schwartz;E. Marsch
我们研究了一个罕见的情况下，当同一块太阳风等离子体通过太阳神1（在0.507 Au）和太阳神2（在0.72 Au）。我们的特殊例子发生在一个相当平滑和典型的高速流的中间。我们发现清楚的迹象表明，在此过境期间的离子行为没有保存粒子的绝热不变量，并需要一些加热的质子和α垂直温度。关于平行温度的情况不太清楚。由于自然的“绝热”冷却过程，α-质子差速的降低似乎并没有释放出太多的自由能。电磁能通量的非常强的径向依赖性，沿着其他因素，表明阿尔文波动的强耗散的可能性。我们的结论在某种程度上被我们发现的许多不准确的来源所削弱，这些来源在这类研究中似乎不可避免。
We have studied one of the rare occasions when the same piece of solar wind plasma passed both Helios 1 (at 0.507 AU) and Helios 2 (at 0.72 AU). Our particular example occurred in the middle of a fairly smooth and typical high-speed stream. We find clear indications that the ion behavior during this transit did not conserve the particles' adiabatic invariants and that some heating is required for the proton and alpha perpendicular temperature. The situation regarding the parallel temperature is less clear. The decreasing alpha-proton differential speed does not appear to release very much free energy owing to a natural “adiabatic” cooling process. A very strong radial dependence of the electromagnetic energy flux, along with other factors, suggests the possibility of strong dissipation of Alfvenic fluctuations. Our conclusions are weakened somewhat by the many sources of inaccuracy that we have found and that seem unavoidable in a study of this kind.