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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Radial diffusion of geomagnetically trapped protons observed by the Galileo Energetic Particle Detector
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Radial diffusion of geomagnetically trapped protons observed by the Galileo Energetic Particle Detector

机译：眼睛困的径向扩散质子由伽利略观察到精力充沛粒子探测器

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摘要

The Galileo spacecraft encountered the Earth once on 8 December 1990 (Earth-I) and again on 8 December 1992 (Earth-II). These flybys provided excellent opportunities to evaluate the performance of the Energetic Particle Detector (EPD) and establish analysis procedures in a relatively well-known environment. Further, because Galileo's Earth flyby trajectories were very rapid and nearly radial, the radiation belt measurements provided an excellent “snapshot” of trapped radiation. Because of the rapid flyby and the 20-s spin period of Galileo, great care had to be taken to remove time aliasing from the pitch angle distributions. Large anisotropies were also present due to intrinsic density gradients. Spherical harmonics were fitted to the pitch and phase distributions in order to obtain fluxes from which phase space densities could be computed. The phase space density (PSD) was calculated from the fitted count rate for the particles (protons) that conserve the first and second adiabatic invariants. The values of 10.0, 15.0, 20.0, 25.0 30.0, 35.0, 40.0, 45.0, and 50.0 MeV/G were used for the first adiabatic invariant, and the values of 0.10, 0.15, 0.20, 0.25, 0.30, and 0.50 G0.5 RE were used for the second adiabatic invariant to determine the PSD from Earth-I and Earth-II observations. The extracted PSDs were examined for radial diffusion. Results show there is no unique global dependency of the diffusion coefficient to L, except for a limited region of the first and second adiabatic invariants.
机译：伽利略飞船遇到地球一次1990年12月8日(我)8日1992年12月(Earth-II)。优秀的评价的机会高能粒子探测器的性能(环保署)和建立分析程序相对知名的环境。因为伽利略路过地球轨迹快速和近径向辐射带测量提供了一个优秀的“快照”被困的辐射。20多岁的伽利略的自转周期,非常小心删除时间混叠螺旋角分布。由于内在的密度也在场吗梯度。为了获得沥青和相位分布通量的相空间密度计算。符合计数率的计算粒子(质子)保存第一和第二个绝热不变量。15.0, 20.0, 25.0 - 30.0, 35.0, 40.0, 45.0和50.0兆电子伏/ G用于第一个绝热的值不变,0.10,0.15,0.20,0.25, 0.30,和0.50 G0.5重新使用第二个绝热不变量来确定PSD从我和Earth-II观察。提取径向PSDs检查扩散。扩散系数的依赖,除了第一次和一个有限的地区第二个绝热不变量。

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