On the transition between the inner and outer plasma sheet in the Earth's magnetotail
On the transition between the inner and outer plasma sheet in the Earth's magnetotail
复制标题
地球磁尾内部和外部等离子体片之间的转变
DOI：
10.1029/2019ja027561
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
and W. Paterson
中科院分区：
文献类型：
--
作者：
Miyashita;Y.;K. Seki;K. Sakaguchi;Y. Hiraki;M. Nose;S. Machida;Y. Saito;and W. Paterson
根据Geotail航天器的离子、电子和磁场数据，我们统计研究了径向距离为R ~（18）~（32）RE的地球磁尾等离子体片的平均结构和性质。本文讨论了赤道面附近等离子体内外片的过渡。离子和电子的数量密度、压强、高能量下的能量通量以及磁场，通常随着离地球的径向距离的增加而减小。流量变化的特征反映在径向压力梯度上。如果内外等离子体片之间的跃迁是由径向压力梯度变化决定的，则离子和电子跃迁的平均位置分别为午夜子午线上的R = 11 ~ 13 RE和R = 11 ~ 17 RE。离子跃迁有可能位于电子跃迁的地侧。此外，我们估计了电场，电和抗磁漂移速度，和κ参数（最小曲率半径的磁场线的最大回转半径的比值的平方根），这是不同的离子内部和外部等离子体片。
We have statistically studied the average structure and properties of the plasma sheet in the Earth's magnetotail at radial distances betweenR∼8 and 32REon the basis of ion, electron, and magnetic field data from the Geotail spacecraft. Here we discuss the transition between the inner plasma sheet and the outer plasma sheet near the equatorial plane. The ion and electron number densities, pressures, and energy fluxes at high energies, as well as the magnetic field, generally decrease with increasing radial distance from the Earth. The characteristics of the flux changes are reflected in the radial pressure gradients. If the transition between the inner and outer plasma sheet is determined by the radial pressure gradient change, the ion and electron transitions are located, on average, atR∼11 to 13REandR∼11 to 17RE, respectively, at the midnight meridian. It is possible that the ion transition is located earthward of the electron transition. Furthermore, we have estimated the electric field, the electric and diamagnetic drift velocities, and theκparameter (the square root of the ratio of the minimum curvature radius of the magnetic field line to the maximum gyroradius), which differ between the ion inner and outer plasma sheet.