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Chandra observations of Jupiter's X-ray auroral emission during Juno apojove 2017

Chandra observations of Jupiter's X-ray auroral emission during Juno apojove 2017
Chandra observations of Jupiter's X-ray auroral emission during Juno apojove 2017
Jupiter's auroral X-rays have been observed for 40 years with an unknown driver producing quasi-periodic emission, concentrated into auroral hot spots. In this study we analyze a ∼ 10 hour Chandra observation from 18:56 on June 18th 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 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 quasi-periodic oscillations (QPOs) of ∼ 37 and ∼ 26 minutes 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.
Jupiter, X-rays, Magnetosphere, Chandra, Juno, QPO, timing analysis
2169-9100
Weigt, D.M.
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Jackman, C.M.
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Dunn, W.R.
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Gladstone, G.R.
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Vogt, M.F.
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Wibisono, A.D.
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Branduardi-Raymont, G.
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Altamirano, D.
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Allegrini, F.
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Ebert, R.W.
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Valek, P.W.
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Thomsen, M.F.
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Clark, G.
145dad26-c17f-4743-abf1-5c2b7ed76d9c
Kraft, R.P.
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Weigt, D.M.
3ed9f7fd-d7e3-4082-8a61-679e9ffa6c9b
Jackman, C.M.
9bc3456c-b254-48f1-ade0-912c5b8b4529
Dunn, W.R.
ce8d659a-2bbb-4331-9807-b555b9907549
Gladstone, G.R.
bef6f242-bbaa-4c52-8d5c-cbde9448e9f1
Vogt, M.F.
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Wibisono, A.D.
e681a2fb-2f3e-49ba-ba25-d7054107c9e5
Branduardi-Raymont, G.
36295f98-922c-47dc-879b-063a8ab190a5
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Allegrini, F.
93abdb02-39ef-4952-a0c8-663dafc651a7
Ebert, R.W.
dd164ffc-bae5-4a7e-b035-fe1e327e3177
Valek, P.W.
de37f56f-d067-4bab-acc0-c2b52be11287
Thomsen, M.F.
710c64ce-779f-4088-8e50-f9e450232f5f
Clark, G.
145dad26-c17f-4743-abf1-5c2b7ed76d9c
Kraft, R.P.
4c0dee71-f912-45e8-b635-b37526788631

Weigt, D.M., Jackman, C.M., Dunn, W.R., Gladstone, G.R., Vogt, M.F., Wibisono, A.D., Branduardi-Raymont, G., Altamirano, D., Allegrini, F., Ebert, R.W., Valek, P.W., Thomsen, M.F., Clark, G. and Kraft, R.P. (2020) Chandra observations of Jupiter's X-ray auroral emission during Juno apojove 2017. Journal of Geophysical Research: Planets, 125 (4), [e2019JE006262]. (doi:10.1029/2019JE006262).

Record type: Article

Abstract

Jupiter's auroral X-rays have been observed for 40 years with an unknown driver producing quasi-periodic emission, concentrated into auroral hot spots. In this study we analyze a ∼ 10 hour Chandra observation from 18:56 on June 18th 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 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 quasi-periodic oscillations (QPOs) of ∼ 37 and ∼ 26 minutes 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.

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Accepted/In Press date: 24 February 2020
e-pub ahead of print date: 26 March 2020
Published date: April 2020
Keywords: Jupiter, X-rays, Magnetosphere, Chandra, Juno, QPO, timing analysis

Identifiers

Local EPrints ID: 438406
URI: http://eprints.soton.ac.uk/id/eprint/438406
ISSN: 2169-9100
PURE UUID: 2e7ee98f-2fc8-4d4c-bb2d-d2d8f32a4cb9
ORCID for C.M. Jackman: ORCID iD orcid.org/0000-0003-0635-7361
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 09 Mar 2020 17:32
Last modified: 07 Oct 2020 02:05

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Contributors

Author: D.M. Weigt
Author: C.M. Jackman ORCID iD
Author: W.R. Dunn
Author: G.R. Gladstone
Author: M.F. Vogt
Author: A.D. Wibisono
Author: G. Branduardi-Raymont
Author: D. Altamirano ORCID iD
Author: F. Allegrini
Author: R.W. Ebert
Author: P.W. Valek
Author: M.F. Thomsen
Author: G. Clark
Author: R.P. Kraft

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