Jupiter's X-Ray and UV Dark Polar Region.
Jupiter's X-Ray and UV Dark Polar Region.
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DOI：
10.1029/2021gl097390
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发表时间：
2022-06-16
影响因子：
5.2
通讯作者：
Ray, L. C.
中科院分区：
文献类型：
--
作者：
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.
我们提出了14个同时钱德拉X射线天文台（CXO）-哈勃太空望远镜（HST）从2016年到2019年对木星北方X射线和紫外线（UV）极光的观测。尽管动态紫外线和X射线极光结构多种多样，但有一个区域因其持续缺乏发射而引人注目：暗极区（DPR）。以前的HST观测表明，DPR产生的紫外辐射非常少。我们发现DPR也产生非常少的X射线光子。对于所有14个观测结果，DPR的低水平X射线发射与散射的太阳辐射和/或Chandra点扩散函数从已知X射线亮区域扩散的光子一致（在2个标准差内）。因此，我们得出结论，对于这14个观察结果，DPR没有产生统计学显著的可检测X射线特征。我们比较了钱德拉X射线天文台和哈勃太空望远镜对木星北方极光的14次同步紫外观测。我们没有从紫外暗极区（DPR）检测到统计上显著的X射线发射。当极光显示太阳风压缩形态时，DPR扩大，漩涡区边界上的X射线和紫外辐射发生变化。
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. We compare 14 simultaneous Chandra X‐ray Observatory and Hubble Space Telescope UV observations of Jupiter's Northern Aurorae We detect no statistically significant X‐ray emission from the UV dark polar region (DPR) The DPR expands and the X‐ray and UV emission on the swirl region boundary shifts when the aurora show solar wind compression morphology