Long Exposure Chandra X‐Ray Observation of Jupiter's Auroral Emissions During Juno Plasmasheet Encounters in September 2021

S McEntee; C Jackman; D Weigt; C Louis; W Dunn; A Boudouma; J Connerney; W Kurth; R Kraft; G Branduardi-Raymont; G Gladstone; M Rutala

doi:10.1029/2023JA031901

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Long Exposure Chandra X‐Ray Observation of Jupiter's Auroral Emissions During Juno Plasmasheet Encounters in September 2021

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Long Exposure Chandra X‐Ray Observation of Jupiter's Auroral Emissions During Juno Plasmasheet Encounters in September 2021

S McEntee, C Jackman, D Weigt, C Louis, W Dunn, A Boudouma, J Connerney, W Kurth, R Kraft, G Branduardi-Raymont, …

Journal of geophysical research. Space physics, Vol.128(12), e2023JA031901

12/01/2023

DOI: 10.1029/2023JA031901

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Abstract

On 15 September 2021, Chandra carried out a 40‐hr (∼4 jovian rotations) observation as part of its longest planetary campaign to study the drivers of jovian X‐ray aurora that may be linked to ultra‐low frequency (ULF) wave activity. During this time, Juno's orbit had taken the spacecraft into Jupiter's dusk magnetosphere. Here is believed to be the most probable location of ULF waves propagating along jovian magnetic field lines that drive the X‐ray auroral emissions. This is the first time that this region has been observed by an orbiter since Galileo >20 years ago, and never before has there been contemporaneous in situ and X‐ray observations. A 1D solar wind propagation model identifies a compression event near the midpoint of the 40‐hr observation window. The influence of a compression is confirmed when comparing the measured magnetic field in the dusk lobes of the magnetotail from Juno MAG data against a baseline lobe field model. Data from the Juno Waves instrument also show activation of broadband kilometric (bKOM) emissions during the arrival of the shock, a feature that has previously been observed during compression events. Therefore this is the first time we can fully analyze the morphological variability during the evolution of a shock. Wavelet transforms and Rayleigh testing are used to search for statistically significant quasi‐periodic pulsations (QPPs) of the X‐ray emissions in the data set, and find significant QPPs with periods of 25–26 min for the northern auroral X‐rays.

Auroras

Broadband

Auroral emissions

Emissions

Extremely low frequencies

Jupiter

Jupiter probes

Magnetic fields

Magnetotails

Planetary magnetic fields

Planetary magnetospheres

Solar wind

Spacecraft

ULF waves

Wave propagation

Wavelet transforms

Details

Title: Subtitle: Long Exposure Chandra X‐Ray Observation of Jupiter's Auroral Emissions During Juno Plasmasheet Encounters in September 2021
Creators: S McEntee - Dublin Institute For Advanced Studies
C Jackman - Dublin Institute For Advanced Studies
D Weigt - Aalto University
C Louis - Dublin Institute For Advanced Studies
W Dunn - University College London
A Boudouma - Université Paris Sciences et Lettres
J Connerney
W Kurth - University of Iowa
R Kraft - Smithsonian Astrophysical Observatory
G Branduardi-Raymont
G Gladstone - Southwest Research Institute
M Rutala - Dublin Institute For Advanced Studies
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.128(12), e2023JA031901
DOI: 10.1029/2023JA031901
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Blackwell Publishing Ltd
Grant note: DOI: 10.13039/501100001602, name: Science Foundation Ireland, award: 18/FRL/6199; DOI: 10.13039/100010661, name: Horizon 2020 Framework Programme, award: 101101005; DOI: 10.13039/501100000271, name: Science and Technology Facilities Council, award: ST/S000240/1; DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: 699041X
Language: English
Date published: 12/01/2023
Academic Unit: Physics and Astronomy
Record Identifier: 9984534365802771

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