Weigt, DM;
Jackman, CM;
Dunn, WR;
Gladstone, GR;
Vogt, MF;
Wibisono, AD;
Branduardi‐Raymont, G;
... Kraft, RP; + view all
(2020)
Chandra Observations of Jupiter's X‐ray Auroral Emission During Juno Apojove 2017.
Journal of Geophysical Research: Planets
, 125
(4)
, Article e2019JE006262. 10.1029/2019je006262.
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Abstract
Jupiter's auroral X-rays have been observed for 40 years with an unknown driver producing quasiperiodic emission, concentrated into auroral hot spots. In this study we analyze an ∼ 10-hr Chandra observation from 18:56 on 18 June 2017. We use a new Python pipeline to analyze the auroral morphology, perform timing analysis by incorporating Rayleigh testing, and use in situ Juno observations to infer the magnetosphere that was compressed during the Chandra interval. During this time Juno was near its apojove position of ∼112 RJ, on the dawn flank of the magnetosphere near the nominal magnetopause position. We present new dynamical polar plots showing an extended X-ray hot spot in the northern auroral region traversing across the Jovian disk. From this morphology, we propose setting a numerical threshold of >7 photons per 5◦ System III longitude × 5◦ latitude to define a photon concentration of the northern hot spot region. Our timing analysis finds two significant quasiperiodic oscillations (QPOs) of ∼37 and ∼26 min within the extended northern hot spot. No statistically significant QPOs were found in the southern X-ray auroral emission. The Rayleigh test is combined with Monte Carlo simulation to find the statistical significance of any QPOs found. We use a flux equivalence mapping model to trace the possible origin of the QPOs, and thus the driver, to the dayside magnetopause boundary.
| Type: | Article |
|---|---|
| Title: | Chandra Observations of Jupiter's X‐ray Auroral Emission During Juno Apojove 2017 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2019je006262 |
| Publisher version: | https://doi.org/10.1029/2019je006262 |
| Language: | English |
| Additional information: | Copyright © 2020 The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10094390 |
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