First measurements of supersonic polar wind in the polar magnetosphere
First measurements of supersonic polar wind in the polar magnetosphere
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极地磁层中超音速极地风的首次测量
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
R. H. Comfort
中科院分区：
文献类型：
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作者：
T. Nagai;J. Waite;J. Green;C. Chappell;R. Olsen;R. H. Comfort
动力学探测器（DE）上的减速离子质谱仪（RIMS）的测量首次揭示了沿沿着极帽场线的超音速极风（马赫数大于1）。这些观测是在65°至81°不变纬度的夜侧（MLT 22：30至23：30）和近2 RE的高度上获得的。使用薄鞘模型拟合数据，得出在+3至+5 V的航天器电势估计范围内，温度范围为0.1至0.2 eV，相应的流速为25至16 km s-1。的H+流的特征是在一般协议与“经典”极风理论预测的，但高变异的He+/H+比观察。
Measurements from the Retarding Ion Mass Spectrometer (RIMS) on Dynamics Explorer (DE) have, for the first time, revealed a supersonic polar wind (Mach number is greater than 1) along polar cap field lines. The observations reported were obtained on the nightside (22:30 to 23:30 MLT) from 65° to 81° invariant latitude and at altitudes near 2 RE. Fitting the data using a thin-sheath model gives a range of temperatures of 0.1 to 0.2 eV with corresponding flow velocities of 25 to 16 km s−1 over the estimated range of spacecraft potential of +3 to +5 V. For these values the Mach number ranged from 5.1 to 2.6 (with a most likely value of 3). Characteristics of the H+ flow are in general agreement with those predicted by "classical" polar wind theory, but high variability of the He+/H+ ratio was observed.