Net current density of photoelectrons emitted from the surface of the GEOTAIL spacecraft
Net current density of photoelectrons emitted from the surface of the GEOTAIL spacecraft
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GEOTAIL航天器表面发射的光电子的净电流密度
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
T. Mukai
中科院分区：
文献类型：
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作者：
T. Nakagawa;T. Ishii;K. Tsuruda;H. Hayakawa;T. Mukai
从GEOTAIL/EFD的单探针模式下测量的航天器的电势和GEOTAIL/LEP获得的等离子体密度和温度在1993年9月14日至1998年10月31日期间，通过假设光电子和环境热电子携带的电流平衡，估计由GEOTAIL航天器发射的光电子携带的电流密度。光电子电流随航天器电势变化的行为与Grard（1973）预测的电流分布一致，发射的光电子由几个温度不同的分量组成。光电子电流的低能量分量的饱和密度为85 ± 33 × 10−6 [Am−2]。探测器表面的光电子数密度估计为2.9 ± 1.4 × 109 [m−3]，光电子的平均能量为2.1 ±0.5 [eV]。这些数值高于Grard的预测值，但与GEOS-1、ISEE-1或维京海盗号以前的飞行中测量值一致。
The current density carried by photoelectrons emitted from the GEOTAIL spacecraft is estimated from the electric potential of the spacecraft measured in the single probe mode of GEOTAIL/EFD and plasma density and temperature obtained by GEOTAIL/LEP during the period from September 14, 1993 to October 31, 1998, by assuming balance of the currents carried by photoelectrons and ambient thermal electrons. Behaviour of the photoelectron current as a function of spacecraft potential is consistent with the current profile predicted by Grard (1973), and the emitted photoelectrons consist of several components with different temperatures. The saturation density of the low energy component of the photoelectron current is 85 ± 33 × 10−6 [Am−2]. Number density of the photoelectrons is estimated to be 2.9 ± 1.4 × 109 [m−3] at the surface of the spacecraft, and the average energy of the photoelectrons is 2.1 ±0.5 [eV]. These values are higher than the prediction by Grard but consistent with previous in-flight measurements from GEOS-1, ISEE-1 or Viking.