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On the spatial character of the ～10 h electron spectrum modulation in the Jovian magnetosphere

机译：木星磁层中〜10 h电子谱调制的空间特征

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摘要

On its voyage in the south duskside Jovian magnetosphere, after leaving the plasma sheet, Ulysses entered a large scale high latitude layer of energetic ions and electrons, extending from ～49 RJ to ～83 RJ. Ulysses traveled within this region from the end of day 41 until the first magnetopause crossing, early on day 43, 1992 and during later expansions of the magnetosphere. Between the time interval ~15 UT, d41-12 UT, d 43, Ulysses recorded: (a) ～10 h periodic variations of the azimuthal and longitudinal components of the magnetic field, (b) spectral index peaks, increased fluxes j_⊥ of ～90 pitch angle electrons and relatively higher fluxes j_⊥ in higher energy channels in phase with (at times of) magnetopause crossings, (c) decreasing fluxes during magnetopause approaches, and (d) ～10h periodic flux, spectral and anisotropy variations of ～40-～300 keV electrons almost in phase (or with some phase shift) with the 10 h magnetic field modulation. These observations strongly suggest that flux, spectral and anisotropy data are well organized in terms of the distance from the magnetopause. We infer that the ～10h periodicities of electron flux, spectral and anisotropy data are produced by intensity gradients in the direction from the magnetopause toward the interior of the large scale of energetic electron layer and the ～10h periodic motion of the magnetosphere/magnetopause.
机译：尤利西斯号在南暮侧木星磁层的航行中，离开等离子薄片后，进入了一个由能量离子和电子组成的大规模高纬度层，范围从〜49 RJ到〜83 RJ。尤利西斯（Ulysses）从第41天结束起，一直到1992年第43天初，直到第一次磁层顶渡过，并在随后的磁层扩张中旅行。在〜15 UT，d41-12 UT，d 43的时间间隔之间，尤利西斯记录了：（a）〜10 h磁场的方位角和纵向分量的周期性变化，（b）频谱指数峰值，磁通量j_⊥增加〜90个俯仰角电子和相对较高的通量j_⊥在较高能量的通道中与（停磁）时间相交；（c）在停磁方法中通量减少；（d）〜10h〜的周期性通量，光谱和各向异性变化40-〜300 keV电子几乎与10 h磁场调制同相（或有些相移）。这些观察结果强烈表明，磁通量，频谱和各向异性数据在距磁绝顶的距离方面井井有条。我们推断，电子通量，光谱和各向异性数据的〜10h周期性是由沿磁层顶向高能电子层内部的方向上的强度梯度以及磁层/磁层顶的〜10h周期性运动产生的。

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