McEntee, SC;
Jackman, CM;
Weigt, DM;
Dunn, WR;
Kashyap, V;
Kraft, R;
Louis, CK;
... Gallagher, PT; + view all
(2022)
Comparing Jupiter's equatorial X-ray emissions with solar X-ray flux over 19 years of the Chandra mission.
Journal of Geophysical Research: Space Physics
, 127
(12)
, Article e2022JA030971. 10.1029/2022ja030971.
Preview |
Text
JGR Space Physics - 2022 - McEntee - Comparing Jupiter s Equatorial X‐Ray Emissions With Solar X‐Ray Flux Over 19 Years of (1).pdf Download (3MB) | Preview |
Abstract
We present a statistical study of Jupiter’s disk X-ray emissions using 19 years of Chandra X-Ray Observatory (CXO) observations. Previous work has suggested that these emissions are consistent with solar X-rays elastically scattered from Jupiter’s upper atmosphere. We showcase a new Pulse Invariant (PI) filtering method that minimises instrumental effects which may produce unphysical trends in photon counts across the nearly-two-decade span of the observations. We compare the CXO results with solar X-ray flux data from the Geostationary Operational Environmental Satellites (GOES) X-ray Sensor (XRS) for the wavelength band 1-8 Å (long channel), to quantify the correlation between solar activity and jovian disk counts. We find a statistically significant Pearson’s Correlation Coefficient (PCC) of 0.9, which confirms that emitted jovian disk X-rays are predominantly governed by solar activity. We also utilise the high spatial resolution of the High Resolution Camera Instrument (HRC-I) on board the CXO to map the disk photons to their positions on Jupiter’s surface. Voronoi tessellation diagrams were constructed with the JRM09 (Juno Reference Model through Perijove 9) internal field model overlaid to identify any spatial preference of equatorial photons. After accounting for area and scattering across the curved surface of the planet, we find a preference of jovian disk emission at 2-3.5 Gauss surface magnetic field strength. This suggests that a portion of the disk X-rays may be linked to processes other than solar scattering: the spatial preference associated with magnetic field strength may imply increased precipitation from the radiation belts, as previously postulated.
| Type: | Article |
|---|---|
| Title: | Comparing Jupiter's equatorial X-ray emissions with solar X-ray flux over 19 years of the Chandra mission |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2022ja030971 |
| Publisher version: | https://doi.org/10.1029/2022ja030971 |
| Language: | English |
| Additional information: | Copyright © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Jupiter, X-ray, Disk, Solar, Chandra, GOES |
| 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 Physics and Astronomy 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/10160860 |
Archive Staff Only
 |
View Item |
