在新视野号飞越木星期间，Alice UV摄谱仪探测到的MeV电子
MeV electrons detected by the Alice UV spectrograph during the New Horizons flyby of Jupiter
摘要：
2007年初，新视野号宇宙飞船在黄昏一侧飞越木星磁层。在这里，我们提出了一种新的方法来检测沿着新视野号轨道的高能电子：爱丽丝紫外光谱仪的背景计数率。能量>1 MeV的电子可以穿透Alice的薄铝外壳，与微通道板检测器相互作用，并产生与FUV光子无法区分的计数。我们提供了以航天器最接近木星为中心的11天期间与MeV电子通量成比例的Alice数据，并将其与PEPSSI仪器的电子数据进行比较。我们发现，一个太阳风压缩事件通过了航天器之前，它进入木星磁层。随后，在67 RJ处探测到磁层顶边界，表明磁层顶为压缩结构.三天后，当航天器位于木星下游35-90 R_J时，新视野号观测到一系列15个电流片交叉，所有这些都发生在模型预测的显著偏北方向，这意味着太阳风对木星磁层中部和外部的影响，甚至到径向距离小到~35 R_J。在1930 ~ 2100 LT之间半厚至少为7.4 R_J，在2200 LT附近突然减薄到约3.4 R_J。
英文摘要：
In early 2007, the New Horizons spacecraft flew through the Jovian magnetosphere on the dusk side. Here, we present results from a novel means of detecting energetic electrons along New Horizons' trajectory: the background count rate of the Alice ultraviolet spectrograph. Electrons with energies >1 MeV can penetrate the thin aluminum housing of Alice, interact with the microchannel plate detector, and produce a count that is indistinguishable from an FUV photon. We present Alice data, proportional to the MeV electron flux, from an 11-day period centered on the spacecraft's closest approach to Jupiter, and compare it to electron data from the PEPSSI instrument. We find that a solar wind compression event passed over the spacecraft just prior to it entering the Jovian magnetosphere. Subsequently, the magnetopause boundary was detected at a distance of 67 R_J suggesting a compressed magnetospheric configuration. Three days later, when the spacecraft was 35-90 R_J downstream of Jupiter, New Horizons observed a series of 15 current sheet crossings, all of which occurred significantly northward of model predictions implying solar wind influence over the middle and outer Jovian magnetosphere, even to radial distances as small as ~35 R_J. In addition, we find the Jovian current sheet, which had a half-thickness of at least 7.4 R_J between 1930 and 2100 LT abruptly thinned to a thickness of ~3.4 R_J around 2200 LT.
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