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Dynamics of the flares in the active polar region of Jupiter

机译:木星活动极区耀斑的动力学

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摘要

The duskside of the polar region of Jupiter's UV aurorae, called the active region, sometimes exhibits quasiperiodic (QP) flares on timescales of 2-3min. Based on Hubble Space Telescope Far-UV time-tag images, we show for the first time that the Northern Hemisphere also displays QP flares. The area covered by these flares can reach up to 2.4 x 10(8)km(2) (i.e., the whole active region) but often only involves an area an order of magnitude smaller. Using a magnetic field mapping model, we deduced that these areas correspond to the dayside outer magnetosphere. In our data set, quasiperiodic features are only seen on half of the cases, and even on a given observation, a region can be quiet for one half and blinking on the other half. Consecutive observations in the two hemispheres show that the brightening can occur in phase. Combined with the size and location of the flares, this behavior suggests that the QP flares most likely take place on closed magnetic field lines.
机译:木星紫外线极光的极区的黄昏侧(称为活动区)有时会在2-3分钟的时间尺度上出现准周期性(QP)耀斑。基于哈勃太空望远镜的远紫外线时间标签图像,我们首次展示了北半球也显示QP耀斑。这些耀斑覆盖的区域可以达到2.4 x 10(8)km(2)(即整个活动区域),但通常只涉及一个小一个数量级的区域。使用磁场映射模型,我们推断出这些区域对应于白天的外部磁层。在我们的数据集中,准周期特征仅在一半的情况下可见,即使在给定的观察结果下,一个区域在一半情况下可能是安静的,而在另一半情况下则是闪烁的。在两个半球中的连续观察表明,增亮可以同相发生。结合耀斑的大小和位置,此行为表明QP耀斑最有可能发生在封闭的磁场线上。

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