Journal article
Understanding the Origin of Jupiter's Diffuse Aurora Using Juno's First Perijove Observations
Geophysical research letters, Vol.44(20), pp.10,162-10,170
10/28/2017
DOI: 10.1002/2017GL075545
Abstract
Juno observed the low‐altitude polar region during perijove 1 on 27 August 2016 for the first time. Auroral intensity and false‐color maps from the Ultraviolet Spectrograph (UVS) instrument show extensive diffuse aurora observed equatorward of the main auroral oval. Juno passed over the diffuse auroral region near the System III longitude of 120°–150° (90°–120°) in the northern (southern) hemisphere. In the region where these diffuse auroral emissions were observed, the Jupiter Energetic Particle Detector Instrument (JEDI) and Jovian Auroral Distributions Experiment (JADE) instruments measured nearly full loss cone distributions for the downward going electrons over energies of 0.1–700 keV but very few upward going electrons. The false‐color maps from UVS indicate more energetic electron precipitation at lower latitudes than less energetic electron precipitation, consistent with observations of precipitating electrons measured by JEDI and JADE. The comparison between particle and aurora measurements provides first direct evidence that these precipitating energetic electrons are mainly responsible for the diffuse auroral emissions at Jupiter.
Key Points
Diffuse auroral emissions were observed in a broad region located equatorward of the main oval by Juno
In the diffuse auroral region, precipitating electrons with nearly full loss cone distributions were observed over 100 s eV‐100 s keV
The pattern of characteristic energy of precipitating electrons is consistent with the auroral Juno‐UVS false‐color map
Details
- Title: Subtitle
- Understanding the Origin of Jupiter's Diffuse Aurora Using Juno's First Perijove Observations
- Creators
- W. Li - Boston UniversityR. M. Thorne - University of California, Los AngelesQ. Ma - Boston UniversityX.‐J. Zhang - University of CaliforniaG. R. Gladstone - Southwest Research InstituteV. Hue - Southwest Research InstituteP. W. Valek - Southwest Research InstituteF. Allegrini - Southwest Research InstituteB. H. Mauk - Johns Hopkins University Applied Physics LaboratoryG. Clark - Johns Hopkins University Applied Physics LaboratoryW. S. Kurth - University of IowaG. B. Hospodarsky - University of IowaJ. E. P. Connerney - Goddard Space Flight CenterS. J. Bolton - Southwest Research Institute
- Resource Type
- Journal article
- Publication Details
- Geophysical research letters, Vol.44(20), pp.10,162-10,170
- DOI
- 10.1002/2017GL075545
- ISSN
- 0094-8276
- eISSN
- 1944-8007
- Number of pages
- 9
- Grant note
- UCLA (ZZM06AA75C) BU (9090011588) NASA (699041X)
- Language
- English
- Date published
- 10/28/2017
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455262602771
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