The energetic charged particle absorption signature of Mimas. Progress report
The energetic charged particle absorption signature of Mimas. Progress report
复制标题
土卫一的高能带电粒子吸收特征。
DOI：
--
复制
发表时间：
1980
期刊：
影响因子：
--
通讯作者：
B. A. Randall
中科院分区：
文献类型：
--
作者：
J. A. Allen;M. Thomsen;B. A. Randall
数据显示了电子强度一分钟下降的情况，这是由四个不同的探测器在 DOY 244/1979 的 1546:51 ERT 上连贯观察到的，当时先锋 11 号在与土星系统相遇期间穿过了土卫一的轨道。通过详细分析，我们表明电子强度的这种吸收微信号似乎可归因于土卫一的粒子扫掠效应；特征的径向宽度主要是由电子纵向漂移率中的能量分散引起的，而不是由径向扩散引起的；土卫一处俘获电子的能谱几乎是单能的，中心位于动能 E = 1.59 MeV，扩展 delta E 约为 1.59 MeV。 0.1兆伏；这种窄光谱在磁层物理学中是独一无二的，是由连续的内部卫星（最重要的是土卫二）对向内扩散的电子群的带通滤波作用造成的；电子的径向扩散系数 D E = 1.0 MeV 在 L = 4 时为 1.0 x 10 的 -10 次方 R(subs) 平方，并且在 L = 3 时可能在 37 到 8.3 10 的 -12 次方 R(subs) 平方范围内。
Data are presented for a one-minute dip in electron intensity that was observed coherently by four different detectors at 1546:51 ERT on DOY 244/1979 as Pioneer 11 crossed the orbit of Mimas inbound during its encounter with the Saturn system. By a detailed analysis, we show that this absorption microsignature in electron intensity is plausibly attributable to the particle sweeping effect of Mimas; the radial width of the signature is caused primarily by energy dispersion in the longitudinal drift rate of electrons and not by radial diffusion; the spectrum of trapped electrons at Mimas is nearly monoenergetic, centered at kinetic energy E = 1.59 MeV with a spread delta E approx. 0.1 MeV; this narrow spectrum, which is unique in magnetospheric physics, is caused by the band-pass filtering action of the successive inner satellites, most importantly Enceladus, on an inward diffusing population of electrons; and the radial diffusion coefficient D of electrons E = 1.0 MeV is 1.0 x 10 to the -10 power R(subs)-squared at L = 4 and and probably in the range 37 to 8.3 10 to the -12 power R(subs)-squared at L = 3.