Dunn W R, Weigt D M, Grodent D, Yao Z H, May D, Feigelman K, Sipos B, Fleming D, McEntee S, Bonfond B, Gladstone G R, Johnson R E, Jackman C M, Guo R L, Branduardi-Raymont G, Wibisono A D, Kraft R P, Nichols J D, Ray L C
Mullard Space Science Laboratory University College London Dorking UK.
The Centre for Planetary Science at UCL/Birkbeck London UK.
Geophys Res Lett. 2022 Jun 16;49(11):e2021GL097390. doi: 10.1029/2021GL097390. Epub 2022 Jun 7.
We present 14 simultaneous Chandra X-ray Observatory (CXO)-Hubble Space Telescope (HST) observations of Jupiter's Northern X-ray and ultraviolet (UV) aurorae from 2016 to 2019. Despite the variety of dynamic UV and X-ray auroral structures, one region is conspicuous by its persistent absence of emission: the dark polar region (DPR). Previous HST observations have shown that very little UV emission is produced by the DPR. We find that the DPR also produces very few X-ray photons. For all 14 observations, the low level of X-ray emission from the DPR is consistent (within 2-standard deviations) with scattered solar emission and/or photons spread by Chandra's Point Spread Function from known X-ray-bright regions. We therefore conclude that for these 14 observations the DPR produced no statistically significant detectable X-ray signature.
我们展示了2016年至2019年期间钱德拉X射线天文台（CXO）和哈勃太空望远镜（HST）对木星北极X射线和紫外线（UV）极光进行的14次同步观测。尽管紫外线和X射线极光结构多种多样，但有一个区域因持续没有发射而引人注目：暗极区（DPR）。先前的哈勃太空望远镜观测表明，暗极区产生的紫外线发射极少。我们发现暗极区产生的X射线光子也很少。在所有14次观测中，暗极区的低水平X射线发射与散射的太阳发射和/或钱德拉点扩散函数从已知X射线明亮区域扩散的光子一致（在2个标准差范围内）。因此，我们得出结论，对于这14次观测，暗极区没有产生统计学上显著可检测的X射线信号。
