DE 1 observations of type 1 counterstreaming electrons and field‐aligned currents
DE 1 observations of type 1 counterstreaming electrons and field‐aligned currents
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DE 1 对 1 型逆流电子和场对准电流的观察
DOI：
10.1029/ja089ia10p08907
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发表时间：
1984
影响因子：
--
通讯作者：
E. Nielsen
中科院分区：
文献类型：
--
作者：
C. Lin;M. Sugiura;J. Burch;J. Barfield;E. Nielsen
在本文中，我们报告说，动力学探测器1号卫星经常检测到类型1逆流电子在该地区的场向电流在高海拔地区的夜间极光区。1型逆流电子通常在低于几百电子伏的能量下被检测到，并与高能（> keV）沉淀电子通量相关。等离子体和磁场测量DE 1被用来调查的相对贡献的高能沉淀电子通量和逆流电子的场向电流密度。通过在两个能量范围内积分二维电子分布函数来计算电流密度：18-235 eV和18- 10，000 eV。在向下电流的情况下，低能量（18 - 140°）俯仰角。逆流电子在场取向方向上的能谱经常被发现具有麦克斯韦函数的特征，偶尔也有谱峰。因此，可以得出结论，逆流电子有助于场向电流密度主要是因为在向上和向下的方向上的通量增强的不平衡。斯堪的纳维亚双极光雷达实验的雷达同步观测表明，DE 1观测到的场向电流是通过电离层中的彼得森电流闭合的。
In this paper we report that the Dynamics Explorer 1 satellite frequently detected type 1 counterstreaming electrons in the region of field-aligned currents at high altitudes in the nighttime auroral zone. Type 1 counterstreaming electrons are generally detected at energies below a few hundred electron volts in association with energetic (> keV) precipitating electron fluxes. The plasma and magnetic field measurements from DE 1 are used to investigate the relative contributions of energetic precipitating electron fluxes and counterstreaming electrons to the field-aligned current density. The current density is computed by integrating the two-dimensional electron distribution functions in two energy ranges: 18–235 eV and 18–10,000 eV. In the case of downward current, low-energy (18 140°) pitch angles. The energy spectra of counterstreaming electrons in the field-aligned directions are frequently found to be characterized by Maxwellian functions and occasionally by spectral peaks. It is thus concluded that counterstreaming electrons contribute to field-aligned current density mostly because of imbalances in the flux enhancement in the upward and downward directions. The Scandinavian Twin Auroral Radar Experiment radar simultaneous observations indicated that the field-aligned current observed by DE 1 was closed through Pedersen currents in the ionosphere.