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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Geomagnetic conjugate observations of plasma-sheet electrons by the FAST and THEMIS satellites
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Geomagnetic conjugate observations of plasma-sheet electrons by the FAST and THEMIS satellites

机译：地磁共轭plasma-sheet的观察忒弥斯电子的快速和卫星

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摘要

We investigate pitch-angle distributions and spectral shapes of auroral electrons simultaneously observed during three conjunction events by the FAST satellite at altitudes of 2500-3500 km and by the THEMIS satellite in the plasma sheet at 7-13 R_E. All three events were on the lower latitude of the auroral oval. Conjunction event 1 occurred at ~1914:45 UT on 10 April 2008. Electron spectra at energies of 0.1-3 keV are correlated well between the two satellites, while the precipitating electrons above 3 keV are missing at FAST. Event 2 occurred at 1255:26 UT on 26 April 2008. Electron spectra above 3 keV are correlated well between the two satellites. An additional broad spectral peak at energies of 0.1-0.5 keV was observed by FAST. Event 3 occurred at 0058:04 UT on 25 December 2008. Precipitating electrons of 0.5-5 keV obtained by FAST are correlated well with those of THEMIS-C, while a monoenergetic peak at 0.1-0.2 keV was observed only by FAST. For the three conjunction events, we conclude that high-energy precipitating auroral electrons observed by FAST directly come from the equatorial plasma sheet, while low-energy precipitating electrons may come from middle altitudes as a result of acceleration by static potential differences. For missing high-energy (>3 keV) electrons of event 1, we speculate that the pitch-angle scattering by waves occurs only at a limited energy range.
机译：我们调查和螺旋角分布极光电子光谱的形状同时观察到在三个结合事件的快速卫星的高度忒弥斯2500 - 3500公里的卫星等离子体在7 - 13 R_E表。较低的纬度的极光椭圆。一起事件发生在1 ~ 10日1914:45 UT2008年4月。凯文两者之间相关性很好卫星,而诱发电子以上3 keV失踪快。2008年4月26日在1255:26 UT。3 keV以上两者之间相关性很好卫星。0.1 - -0.5 keV能量是观察到快。12月25日事件发生在3 0058:04 UT2008. 通过相关好与快THEMIS-C,单色的高峰0.1 - -0.2 keV观察只有快。三个一起事件,我们认为高能沉淀极光电子直接来自于观察到快赤道等离子板,而低能耗沉淀电子可能来自中间海拔的结果由静态加速度潜在的差异。(> 3 keV)电子事件1,我们推测螺旋角散射波只发生在一个有限的能量范围。

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