论文标题
Ganymede的Auroral Ovals的南北亮度比：Hubble太空望远镜观测到Juno PJ34 Flyby周围
Alternating north-south brightness ratio of Ganymede's auroral ovals: Hubble Space Telescope observations around the Juno PJ34 flyby
论文作者
论文摘要
我们报告了2021年6月7日在Juno Spacecraft的飞行中拍摄的Hubble太空望远镜观察结果。我们发现，Ganymede的北部和南部Auroral椭圆形在明亮的北部和南部的Auroral椭圆形替代品，因此，椭圆形的椭圆形面对木星的磁层层面比是Brighter的一部分。这表明为Ganymede的Aurora提供动力的发电机是Ganymede磁层北部和南部的Jovian等离子表的动力。 ganymede与月球上方和下方的等离子板的磁耦合会导致不对称的磁应力和电磁能通量最终为极光加速器提供动力。在短时间尺度上，无明显的统计学上显着的时间变化可以解决。我们表明，其OI1356Å$ \; $发射使Ganymede成为非常差的极光发射器所需的几十M $^{ - 2} $的电子能量通量。
We report results of Hubble Space Telescope observations from Ganymede's orbitally trailing side which were taken around the flyby of the Juno spacecraft on June 7, 2021. We find that Ganymede's northern and southern auroral ovals alternate in brightness such that the oval facing Jupiter's magnetospheric plasma sheet is brighter than the other one. This suggests that the generator that powers Ganymede's aurora is the momentum of the Jovian plasma sheet north and south of Ganymede's magnetosphere. Magnetic coupling of Ganymede to the plasma sheet above and below the moon causes asymmetric magnetic stresses and electromagnetic energy fluxes ultimately powering the auroral acceleration process. No clear statistically significant time variability of the auroral emission on short time scales of 100s could be resolved. We show that electron energy fluxes of several tens of mW m$^{-2}$ are required for its OI 1356 Å$\;$ emission making Ganymede a very poor auroral emitter.
