Space and Planetary Science; Geophysics; Jupiter; Aurora; Juno
Abstract :
[en] 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.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Haewsantati, Kamolporn ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Ph.D. program in Physics Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand ; National Astronomical Research Institute of Thailand (Public Organization) Chiang Mai Thailand
Bonfond, Bertrand ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Wannawichian, S. ; National Astronomical Research Institute of Thailand (Public Organization) Chiang Mai Thailand ; Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai Thailand
Gladstone, G. R.; Southwest Research Institute San Antonio Texas USA
Hue, V. ; Southwest Research Institute San Antonio Texas USA ; Aix‐Marseille Université CNRS CNES Institut Origines LAM Marseille France
Greathouse, T. K.; Southwest Research Institute San Antonio Texas USA
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Yao, Zhonghua ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Key Laboratory of Earth and Planetary Physics Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
Gérard, Jean-Claude ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Guo, Ruilong ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP) ; Laboratory of Optical Astronomy and Solar‐Terrestrial Environment Institute of Space Sciences School of Space Science and Physics Shandong University Weihai Shandong China
Elliott, S. ; Department of Physics and Astronomy University of Iowa Iowa City IA USA ; School of Physics and Astronomy University of Minnesota Minneapolis MN USA
Mauk, B. H. ; The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
Clark, G. ; The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
Gershman, D. ; NASA Goddard Space Flight Center Greenbelt MD USA
Kotsiaros, S. ; Technical University of Denmark (DTU) DTU Space Kongens Lyngby Denmark
Kurth, W. S. ; Department of Physics and Astronomy University of Iowa Iowa City IA USA
Connerney, J. ; NASA Goddard Space Flight Center Greenbelt MD USA
Szalay, J. R. ; Department of Astrophysical Sciences Princeton University Princeton NJ USA
Phriksee, A.; National Astronomical Research Institute of Thailand (Public Organization) Chiang Mai Thailand
All data used herein can be found in the Planetary Data System (PDS) (https://pds.nasa.gov). Ultraviolet Spectrograph (UVS) data can be obtained from https://pds-atmospheres.nmsu.edu/cgi-bin/getdir.pl?dir=DATA&volume=jnouvs_3001 (Trantham, 2014). Waves survey data can be found in https://pds.nasa.gov/ds-view/pds/viewDataset.jsp?dsid=JNO-E/J/SS-WAV-3-CDR-SRVFULL-V2.0 (Kurth & Piker, 2022). Juno Magnetometer data can be found in https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/JNO-J-3-FGM-CAL-V1.0 (Connerney, 2022). JEDI data can be obtained from https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/JNO-J-JED-3-CDR-V1.0 (Mauk, 2022). Jovian Auroral Distributions Experiment data may be found in https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/JNO-J_SW-JAD-3-CALIBRATED-V1.0 (Allegrini et al., 2022).
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