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Variability of Jupiter's IR H-3(+) aurorae during Juno approach

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posted on 05.07.2019, 12:50 by L Moore, J O'Donoghue, H Melin, T Stallard, C Tao, B Zieger, J Clarke, MF Vogt, T Bhakyapaibul, M Opher, G Toth, JEP Connerney, S Levin, S Bolton
We present ground‐based observations of Jupiter's H3+ aurorae over four nights in April 2016 while the Juno spacecraft was monitoring the upstream interplanetary magnetic field. High‐precision maps of auroral H3+ densities, temperatures, and radiances reveal significant variabilities in those parameters, with regions of enhanced density and emission accompanied by reduced temperature. Juno magnetometer data, combined with solar wind propagation models, suggest that a shock may have impacted Jupiter in the days preceding the observation interval but that the solar wind was quiescent thereafter. Auroral H3+ temperatures reveal a downward temporal trend, consistent with a slowly cooling upper atmosphere, such as might follow a period of shock recovery. The brightest H3+ emissions are from the end of the period, 23 April. A lack of definitive signatures in the upstream interplanetary magnetic field lends supporting evidence to the possibility that this brightening event may have been driven by internal magnetospheric processes.

Funding

National Aeronautics and Space Administration (NASA). Grant Numbers: NNX14AG72G, STScI‐GO14105.01A RCUK | Science and Technology Facilities Council (STFC) National Science Foundation (NSF). Grant Number: 1524651 NASA postdoctoral program. Grant Number: Goddard Space Flight Center National Science Foundation. Grant Number: 1524651 National Aeronautics and Space Administration. Grant Numbers: STScI‐GO14105.01A, NNX14AG72G

History

Citation

GEOPHYSICAL RESEARCH LETTERS, 2017, 44 (10), pp. 4513-4522 (10)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

VoR (Version of Record)

Published in

GEOPHYSICAL RESEARCH LETTERS

Publisher

AMER GEOPHYSICAL UNION

issn

0094-8276

eissn

1944-8007

Acceptance date

02/05/2017

Copyright date

2017

Available date

05/07/2019

Notes

The Juno MAG cruise data used in this study can be found on the Planetary Data System: https://ppi.pds.nasa.gov/search/view/?f=yes&id=pds://PPI/JNO‐SS‐3‐FGM‐CAL‐V1.0. Keck data are publically accessible after 18 months (October 2017 for this data set, details here: https://koa.ipac.caltech.edu/UserGuide/access.html.

Language

en