Solar wind and magnetosphere plasma diagnostics by spacecraft electrostatic potential measurements
Solar wind and magnetosphere plasma diagnostics by spacecraft electrostatic potential measurements
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DOI：
10.1007/s00585-995-0118-8
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发表时间：
1995-02
影响因子：
1.9
通讯作者：
A. Pedersen
中科院分区：
文献类型：
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作者：
A. Pedersen
几颗卫星（GEOS-1、GEOS-2、ISEE-1、Viking和CRRES）进行了电场实验，在这些实验中，探测器被来自卫星的电流驱动到接近等离子体电位的位置。电场探头与其航天器（具有导电表面）之间的电位差可用于确定环境电子密度和/或电子通量，精度有限，但时间分辨率高，约为10-100毫秒。了解探测器和卫星的光电特性是发展这种诊断方法的必要条件。根据上述卫星上的电场实验，所有材料在不受大气氧影响的情况下都具有非常相似的光电特性。在太空的头几个月里，光电子产量稳步增加，并达到远高于实验室中干净表面上测量的值。该方法可用于距离太阳0.4至5天文单位对应的太阳辐射水平。
Several satellites (GEOS-1, GEOS-2, ISEE-1, Viking and CRRES) carried electric field experiments on which probes were driven by a current from the satellite to be close to the plasma potential. The potential difference between an electric field probe and its spacecraft (with conductive surfaces) can be used to determine the ambient electron density and/or electron flux with limited accuracy but with high time resolution, of the order of 10–100 ms. It is necessary for the development of this diagnostic method to understand the photoemission characteristics of probes and satellites. According to the electric field experiments on the above-mentioned satellites, all materials develop very similar photoemission properties when they are beyond the influence of atmospheric oxygen. The photoelectron yield steadily increases over the first few months in space and reaches values well above those measured on clean surfaces in the laboratory. The method can be used for solar radiation levels corresponding to distances from 0.4 to 5 AU from the Sun.