The Magnetospheric Trough
The Magnetospheric Trough
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磁层槽
DOI：
10.1029/gm104p0355
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
R. Elphic
中科院分区：
文献类型：
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作者：
M. Thomsen;D. McComas;J. Borovsky;R. Elphic
本文回顾了磁层冷离子槽和热电子槽概念的发展历史，认为这两个区域在本质上是相同的。磁层槽可以看作对流通量管演化过程中的一种时间状态。这些通量管与地球的高层大气接触，高层大气既作为沉淀热等离子体片电子的汇，又作为冷电离层等离子体的源，导致等离子体片逐渐耗尽并重新填充冷等离子体。地球同步等离子体观测表明，等离子体片电子能量密度的损失率与扩散极光低纬度边缘的沉淀电子通量相当。地球同步通量管填充冷电离层等离子体的速率被认为是与以前的估计早期再填充。地球同步观测进一步表明，库仑碰撞和波粒效应都可能在将电离层物质截留在磁层中方面发挥作用。
The authors review the history of the concepts of the magnetospheric cold-ion trough and hot-electron trough and conclude that the two regions are actually essentially the same. The magnetospheric trough may be viewed as a temporal state in the evolution of convecting flux tubes. These flux tubes are in contact with the earth`s upper atmosphere which acts both as a sink for precipitating hot plasma sheet electrons and as a source for the cold ionospheric plasma leading to progressive depletion of the plasma sheet and refilling with cold plasma. Geosynchronous plasma observations show that the rate of loss of plasma-sheet electron energy density is commensurate with the precipitating electron flux at the low-latitude edge of the diffuse aurora. The rate at which geosynchronous flux tubes fill with cold ionospheric plasma is found to be consistent with previous estimates of early-time refilling. Geosynchronous observations further indicate that both Coulomb collisions and wave-particle effects probably play a role in trapping ionospheric material in the magnetosphere.