SCIFER‐Cleft region thermal electron distribution functions
SCIFER‐Cleft region thermal electron distribution functions
复制标题
SCIFER-裂隙区域热电子分布函数
DOI：
10.1029/96gl01486
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发表时间：
1996
影响因子：
5.2
通讯作者：
R. Arnoldy
中科院分区：
文献类型：
--
作者：
C. Pollock;T. Moore;M. Adrian;P. Kintner;R. Arnoldy
在美国宇航局的裂缝区离子喷泉能量区探测（SCIFER）火箭上，在地球的地磁裂缝电离层中获得了能量<1至60 eV的微分定向电离层电子测量。我们介绍了电子数据集，给出了电子温度测量，并展示了在电离层附近和间隙内测量的相空间分布的例子。上层电子温度范围从高能电子捕获边界以南的0.15 eV到极光间隙降水区内的1 eV。场向电子爆发向下延伸到热能，并与核心合并，产生核心加热和衍生电子温度的各向异性。确定了一个区间，其中增强的电子温度与深度密度耗尽，低频静电波和横向离子加热同时存在，与电流驱动的离子回旋加速器不稳定性的操作一致。在下坡，在可能是极帽的地方，观察到热电子能量分布的形状相当均匀，温度接近0.25 eV。
Differential directional ionospheric electron measurements at energies from <1 to 60 eV have been obtained in the Earth's geomagnetic cleft ionosphere on NASA's Sounding of the Cleft Region Ion Fountain Energization Region (SCIFER) rocket. We introduce the electron data set, present electron temperature measurements, and show examples of phase space distributions measured near and in the cleft ionosphere. Topside electron temperatures ranged from near 0.15 eV south of the high energy electron trapping boundary to near 1 eV within precipitation regions in the auroral cleft. Field-aligned electron bursts extend down to thermal energies and merge with the core, yielding core heating and anisotropy in the derived electron temperature. One interval is identified where enhanced electron temperature is collocated with a deep density depletion, low frequency electrostatic waves, and transverse ion heating, consistent with operation of the current-driven ion cyclotron instability. On the downleg, in what may be polar cap, the shape of the thermal electron energy distribution was observed to be quite uniform, with temperatures near 0.25 eV.