当前位置: X-MOL 学术Geophys. Res. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Upward, MeV-Class Electron Beams Over Jupiter's Main Aurora
Geophysical Research Letters ( IF 4.6 ) Pub Date : 2024-12-18 , DOI: 10.1029/2024gl108799
B. H. Mauk, Q. Ma, H. N. Becker, J. L. Jørgensen, T. Denver, J. E. P. Connerney, F. Allegrini, F. Bagenal, S. J. Bolton, G. Clark, D. K. Haggerty, P. Kollmann, C. P. Paranicas

Jupiter's poleward (Zone II) main aurora exhibits bi-directional electron acceleration; upward acceleration dominates but downward acceleration generates strong aurora. During Juno's first perijove (PJ1), the upward acceleration manifested as narrow electron angular beams (within ∼5° of the magnetic field) over the 30–1,200 keV energy range of Juno's Jupiter Energetic Particle Detector Investigation (JEDI). These beams can be simply connected (non-uniquely) to >10 to perhaps 100's of MeV electrons that penetrated the radiation shielding of the camera head of the Magnetometer Investigation's Advanced Stellar Compass (ASC). The most intense of those multiple MeV populations are shown to have been highly directional and propagating upwards. How auroral processes generate such beams is unknown. With azimuthal symmetry assumed (not demonstrated here), these beams provided >1026 s−1 of >30 keV electrons to Jupiter's vast magnetosphere, a possibly critical and dominating source of energetic electrons to that region and ultimately to Jupiter's radiation belts.

中文翻译:


向上,MeV 级电子束飞越木星的主极光



木星的极地(II 区)主极光表现出双向电子加速;向上的加速度占主导地位,但向下的加速度会产生强烈的极光。在朱诺号的第一个近鹖 (PJ1) 期间,向上的加速度表现为在朱诺号木星高能粒子探测器研究 (JEDI) 的 30-1,200 keV 能量范围内的狭窄电子角束(磁场的 ∼5° 范围内)。这些光束可以简单地(非唯一地)连接到 >10 到 100 个 MeV 电子,这些电子穿透了磁力计调查的高级恒星罗盘 (ASC) 相机头的辐射屏蔽层。这些多个 MeV 种群中最强烈的被证明是高度定向的并向上传播。极光过程是如何产生这种光束的尚不清楚。在假设方位对称性的情况下(此处未演示),这些光束为木星巨大的磁层提供了 >10 26−1 的 >30 keV 电子,这可能是该区域并最终到达木星辐射带的关键和主要高能电子来源。
更新日期:2024-12-19
down
wechat
bug