Simultaneous Observation of an Auroral Dawn Storm With the Hubble Space Telescope and Juno

B. G. Swithenbank-Harris; J. D. Nichols; F. Allegrini; F. Bagenal; B. Bonfond; E. J. Bunce; G. Clark; W. S. Kurth; B. H. Mauk; R. J. Wilson

doi:10.1029/2020JA028717

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Simultaneous Observation of an Auroral Dawn Storm With the Hubble Space Telescope and Juno

Journal article

Peer reviewed

Simultaneous Observation of an Auroral Dawn Storm With the Hubble Space Telescope and Juno

B. G. Swithenbank-Harris, J. D. Nichols, F. Allegrini, F. Bagenal, B. Bonfond, E. J. Bunce, G. Clark, W. S. Kurth, B. H. Mauk and R. J. Wilson

Journal of geophysical research. Space physics, Vol.126(4), pp.2020-n/a

04/2021

DOI: 10.1029/2020JA028717

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Abstract

On July 13, 2016, the Hubble Space Telescope observed the onset of a dawn storm in Jupiter's northern ultraviolet aurora, while the NASA Juno spacecraft simultaneously traversed the dawnside outer magnetosphere. This represents the first concurrent auroral and in situ magnetospheric observations of the onset of a dawn storm at Jupiter. Mapping the auroral emission to the magnetosphere reveals the dawn storm corresponds to a source region at similar to 60 Jupiter radii, and the eastward edge propagates toward local noon at speeds exceeding corotation. Particle observations from Jovian Auroral Distributions Experiment (JADE) and Jupiter Energetic particle Detector Instrument (JEDI) reveal the presence of enhanced hot plasma density in the outer magnetosphere during this interval, and pitch angle distributions measured with JEDI reveal pronounced field-aligned proton and heavy ion motion. Juno magnetometer (MAG) signatures reveal a reversal in the azimuthal magnetic field at the time of storm onset, suggesting acceleration of the hot plasma population above typical sub-corotational speeds. JEDI also detects a region of energetic particles which persists throughout the day following the storm, a feature which is not observed during subsequent perijoves. We interpret this dawn storm as the result of reconnection at earlier local times, possibly associated with a disruption of the azimuthal magnetodisk current.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: Simultaneous Observation of an Auroral Dawn Storm With the Hubble Space Telescope and Juno
Creators: B. G. Swithenbank-Harris - University of Leicester
J. D. Nichols - University of Leicester
F. Allegrini - The University of Texas at San Antonio
F. Bagenal - Laboratory for Atmospheric and Space Physics
B. Bonfond - University of Liège
E. J. Bunce - University of Leicester
G. Clark - Johns Hopkins University Applied Physics Laboratory
W. S. Kurth - University of Iowa
B. H. Mauk - Johns Hopkins University Applied Physics Laboratory
R. J. Wilson - Laboratory for Atmospheric and Space Physics
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.126(4), pp.2020-n/a
DOI: 10.1029/2020JA028717
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Amer Geophysical Union
Number of pages: 15
Grant note: NASA New Frontiers Program STFC Studentship; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) ST/N000749/1 / STFC Consolidated Grant; UK Research & Innovation (UKRI); Science & Technology Facilities Council (STFC) GO 14105 / NASA/ESA Hubble Space Telescope; National Aeronautics & Space Administration (NASA) Royal Society Wolfson Research Merit Award; Royal Society
Language: English
Date published: 04/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9984455541002771

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