Journal article
Juno's Multi‐Instruments Observations During the Flybys of Auroral Bright Spots in Jupiter's Polar Aurorae
Journal of geophysical research. Space physics, Vol.128(8), e2023JA031396
08/2023
DOI: 10.1029/2023JA031396
Abstract
Abstract Juno's arrival at Jupiter in 2016 revealed unprecedented details about Jupiter's ultraviolet aurorae thanks to its unique suite of remote sensing and in situ instruments. Here we present results from in situ observations during Juno flybys above specific bright auroral spots in Jupiter's polar aurora. We compare data observed by Juno‐UVS, JEDI, JADE, Waves, and MAG instruments when Juno was magnetically connected to bright polar auroral spots (or their immediate vicinity) during perijove 3 (PJ3), PJ15, and PJ33. The highly energetic particles observed by JEDI show enhancements dominated by upward electrons, which suggests that the particle acceleration region takes place below the spacecraft. Moreover, brightness and upward particle flux were higher for the northern bright spot in PJ3 than the southern spots found in PJ15 and PJ33. In addition, we notice the intensification of whistler‐mode waves at the time of the particle enhancements, suggesting that wave‐particle interactions contribute to the acceleration of particles that cause the UV aurorae. The MAG data reveal magnetic perturbations during the PJ3 spot detection by Juno, which suggests the presence of significant field‐aligned electric currents. While the stable positions of the bright spots in System III suggest that the phenomenon is fixed to the planet's rotation, the presence of field‐aligned currents leaves the possibility of an origin rooted much farther in the magnetosphere.
Key Points Jupiter's auroral bright spot emissions observed by Juno‐Ultraviolet Spectrograph were simultaneously measured with the JADE, JEDI, Waves, and MAG instruments For each event, we observe characteristic changes in particle distributions, wave emissions, and magnetic field disturbances Whistler waves and electric currents appear to play a role in generating bright auroral polar spots
Details
- Title: Subtitle
- Juno's Multi‐Instruments Observations During the Flybys of Auroral Bright Spots in Jupiter's Polar Aurorae
- Creators
- K. Haewsantati - Chiang Mai UniversityB. Bonfond - LPAP STAR Institute Université de Liège Liège BelgiumS. Wannawichian - Chiang Mai UniversityG. R. Gladstone - Southwest Research InstituteV. Hue - Southwest Research InstituteT. K. Greathouse - Southwest Research InstituteD. Grodent - LPAP STAR Institute Université de Liège Liège BelgiumZ. Yao - LPAP STAR Institute Université de Liège Liège Belgium, Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaJ.‐C. Gérard - LPAP STAR Institute Université de Liège Liège BelgiumR. Guo - Shandong UniversityS. Elliott - Department of Physics and Astronomy University of Iowa Iowa City IA USA, School of Physics and Astronomy University of Minnesota Minneapolis MN USAB. H. Mauk - The Johns Hopkins University Applied Physics Laboratory Laurel MD USAG. Clark - The Johns Hopkins University Applied Physics Laboratory Laurel MD USAD. Gershman - Goddard Space Flight CenterS. Kotsiaros - Technical University of DenmarkW. S. Kurth - University of IowaJ. Connerney - Goddard Space Flight CenterJ. R. Szalay - Princeton UniversityA. Phriksee - National Astronomical Research Institute of Thailand
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.128(8), e2023JA031396
- DOI
- 10.1029/2023JA031396
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Grant note
- DOI: 10.13039/501100017170, name: Thailand Science Research and Innovation, award: RTA6280002; DOI: 10.13039/501100002661, name: Fonds De La Recherche Scientifique - FNRS; DOI: 10.13039/501100002749, name: Belgian Federal Science Policy Office; DOI: 10.13039/501100018527, name: Key Research Program of Frontier Science, Chinese Academy of Sciences, award: IGGCAS‐201904; DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: NNM06AA75C, 699041X
- Language
- English
- Date published
- 08/2023
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455552502771
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