Jupiter's X-Ray and UV Dark Polar Region

W. R. Dunn, D. M. Weigt, D. Grodent, Z. H. Yao, D. May, K. Feigelman, B. Sipos, D. Fleming, S. McEntee, B. Bonfond, G. R. Gladstone, R. E. Johnson, C. M. Jackman, R. L. Guo, G. Branduardi-Raymont, A. D. Wibisono, R. P. Kraft, J. D. Nichols, L. C. Ray

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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.
Original languageEnglish
Article numbere2021GL097390
Number of pages13
JournalGeophysical Research Letters
Issue number11
Early online date07 Jun 2022
Publication statusPublished - 16 Jun 2022


  • Space Sciences
  • Airglow and aurora
  • Auroral ionosphere
  • Current systems
  • Auroral phenomena
  • Cusp
  • Field‐aligned currents and current systems
  • Polar cap phenomena
  • Research Letter
  • Jupiter
  • Hubble Space Telescope
  • magnetosphere
  • dark polar region
  • aurora
  • Chandra X‐ray Observatory


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