PLASMA INJECTION AND TRANSPORT IN THE MID-ALTITUDE POLAR CUSP
PLASMA INJECTION AND TRANSPORT IN THE MID-ALTITUDE POLAR CUSP
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DOI：
10.1029/gl009i009p00921
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发表时间：
1982-01-01
影响因子：
5.2
通讯作者：
BARFIELD, JN
中科院分区：
文献类型：
--
作者：
BURCH, JL;REIFF, PH;BARFIELD, JN
在中海拔极尖的DE‐1热等离子体观测显示了一个显著的速度滤波现象的证据，这与位于约8re的地心距离（偶极近似）的等离子体注入的纬度狭窄区域一致。从注入区到极帽的等离子体对流导致在接近4re的地心距离上的“V”形对数E与α相关。这种速度过滤效应允许测量比迄今为止用热等离子体测量可能测量的小得多的流速（~ 10 km/s）。由此确定的流与DE - 2航天器几乎同时测量的电离层流是一致的，尽管高海拔流的量级比∼r3/2偶极子场作图预测的要高2倍或更多。
DE‐1 hot plasma observations in the mid‐altitude polar cusp have shown evidence of a significant velocity filtering phenomenon which is consistent with a latitudinally narrow region of plasma injection located at a geocentric distance of about 8 RE(in a dipole approximation). Plasma convection from the injection region into the polar cap results in a ‘V’‐shaped log E vs. αorelation at geocentric distances near 4 RE. This velocity filtering effect allows the measurement of much smaller flow velocities (∼10 km/s) than have heretofore been possible with hot plasma measurements. The flows thus determined are consistent with ionospheric flows measured nearly simultaneously by the DE‐2 spacecraft, although the magnitudes of the higher altitude flows are higher by a factor of 2 or more than an ∼r3/2dipole‐field mapping would predict.