Relation between energetic electrons, protons, and the thermal plasma sheet population: Plasma sheet recovery events
Relation between energetic electrons, protons, and the thermal plasma sheet population: Plasma sheet recovery events
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高能电子、质子和热等离子体片群之间的关系：等离子体片恢复事件
DOI：
10.1029/ja090ia03p02735
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发表时间：
1985
影响因子：
--
通讯作者：
D. Hovestadt
中科院分区：
文献类型：
--
作者：
M. Scholer;N. Sckopke;F. Ipavich;D. Hovestadt
我们研究了热，低能量超热，和高能量质子和电子在等离子体片附近的当地午夜在地核距离为14- 20 R/sub E/在五个不同的等离子体片渗透。这些数据是用洛斯阿拉莫斯国家实验室/马克斯-普朗克研究所的快速等离子体分析仪和马克斯-普朗克研究所/马里兰州大学的高能粒子传感器系统在ISEEI上获得的。据发现，超热质子的强度时间分布高达约。150千电子伏密切遵循的热质子人口的强度分布。能量>或接近的质子。=200 keV时，表现出典型的快升慢衰曲线;衰减时间常数随能量的增加而减小。当从叶进入等离子体片时，高能质子相对于热质子和低能超热质子被延迟。高能电子不遵循高能质子的分布。它们在等离子体片出现后约30分钟达到最大值，这是由热电子确定的。在高能电子达到其最大强度之后，其强度时间分布紧密地跟随热总体的电子温度的任何变化。的意见进行了讨论的各种模型。特别是，在尾道处的离子加速，在恢复期间后退更多»中性线可以一致地解释离子观察。高能电子的加速机制尚不清楚，有人认为它们可能是由热粒子群中的随机过程加速的。«少
We have investigated thermal, low-energy suprathermal, and high-energy protons and electrons in the plasma sheet near local midnight at geocenric distances of 14--20 R/sub E/ during five different plasma sheet penetrations. The data have been obtained with the Los Alamos National Laboratory/Max-Planck-Institut fast plasma analyzer and the Max-Planck-Institut/University of Maryland energetic particle sensor system on ISEEI. It is found that the intensity time profile of suprathermal protons up to approx.150 keV follows closely the intensity profile of the thermal proton population. The protons with energies > or approx. =200, keV exhibit a typical fast rise-slow decay profile; the decay time constant decreases with increasing energy. When entering the plasma sheet from the lobe the high-energy protons are delayed in relation to the thermal and low-energy suprathermal protons. Energetic electrons do not follow the energetic proton profile. They reach their maximum about 30 min after the appearance of the plasma sheet as determined by the thermal electrons. After the energetic electrons have reached their maximum intensity, their intensity time profile follows closely any changes in the electron temperature of the thermal population. The observations are discussed in terms of various models. In particular, acceleration of the ions at a tailway, retreatingmore » neutral line during recovery can consistently explain the ion observations. The acceleration mechanism for energetic electrons is unclear, and it is argued that they may be accelerated by a stochiastic process out of the thermal population.« less