Juno's Multi‐Instruments Observations During the Flybys of Auroral Bright Spots in Jupiter's Polar Aurorae

Author:

Haewsantati K.123ORCID,Bonfond B.1ORCID,Wannawichian S.34ORCID,Gladstone G. R.5,Hue V.56ORCID,Greathouse T. K.5,Grodent D.1ORCID,Yao Z.17ORCID,Gérard J.‐C.1,Guo R.18ORCID,Elliott S.910ORCID,Mauk B. H.11ORCID,Clark G.11ORCID,Gershman D.12ORCID,Kotsiaros S.13ORCID,Kurth W. S.9ORCID,Connerney J.12ORCID,Szalay J. R.14ORCID,Phriksee A.3

Affiliation:

1. LPAP STAR Institute Université de Liège Liège Belgium

2. Ph.D. Program in Physics Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand

3. National Astronomical Research Institute of Thailand (Public Organization) Chiang Mai Thailand

4. Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand

5. Southwest Research Institute San Antonio TX USA

6. Aix‐Marseille Université CNRS CNES Institut Origines LAM Marseille France

7. Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

8. Laboratory of Optical Astronomy and Solar‐Terrestrial Environment Institute of Space Sciences School of Space Science and Physics Shandong University Weihai China

9. Department of Physics and Astronomy University of Iowa Iowa City IA USA

10. School of Physics and Astronomy University of Minnesota Minneapolis MN USA

11. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA

12. NASA Goddard Space Flight Center Greenbelt MD USA

13. DTU Space Technical University of Denmark (DTU) Kongens Lyngby Denmark

14. Department of Astrophysical Sciences Princeton University Princeton NJ USA

Abstract

AbstractJuno'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.

Funder

Thailand Science Research and Innovation

Fonds De La Recherche Scientifique - FNRS

Belgian Federal Science Policy Office

Key Research Program of Frontier Science, Chinese Academy of Sciences

National Aeronautics and Space Administration

Publisher

American Geophysical Union (AGU)

Subject

Space and Planetary Science,Geophysics

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