On the Relation Between Auroral Morphologies and Compression Conditions of Jupiter's Magnetopause: Observations From Juno and the Hubble Space Telescope
Space and Planetary Science; Geophysics; Juno; Aurora
Abstract :
[en] Jupiter displays the most powerful auroral emissions in our solar system, which result from strong energy dissipation in Jupiter's surrounding space environment. Although mass and energy in Jupiter's magnetosphere mostly come from the innermost Galilean moon Io's volcanic activity and Jupiter's rotation, solar wind perturbations can play crucial roles in releasing magnetospheric energy. The systematic response of the aurora to a solar wind compression remains poorly understood because of timing uncertainties. Here we report the analysis of a set of auroral images from the Hubble Space Telescope with contemporaneous in situ magnetopause detections from Juno, allowing for a more direct comparison. By analyzing the dawn side main auroral emission, we distinguish two non-mutually exclusive types of auroral enhancements: auroral dawn storm (ADS) featured with latitudinal extension in limited longitudes, and a long-lasting main auroral brightening with limited extension in latitudes while extending over a large longitude range. Only the latter systematically appears under a compressed magnetopause, while the dawn storms could occur whatever the state of the magnetopause. The results could provide important constraints to improve theoretical models and numerical simulations. During expanded magnetopause conditions, Jupiter's aurora displayed either quiet or dawn storm morphology. The result is consistent with recent discovery of the initiation of ADSs in midnight and post-midnight, possibly driven by magnetic reconnection plasma instabilities in night magnetotail. Our results show that some typical auroral morphologies could be used as a diagnostic of solar wind conditions at Jupiter.
Research center :
STAR - Space sciences, Technologies and Astrophysics Research - ULiège
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
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 ; College of Earth and Planetary Sciences University of Chinese Academy of Sciences Beijing China
Bonfond, Bertrand ✱; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Grodent, Denis ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Chané, E. ; Centre for Mathematical Plasma Astrophysics KU Leuven Leuven Belgium
Dunn, W. R. ; Mullard Space Science Laboratory University College London Dorking UK
Kurth, W. S. ; Department of Physics and Astronomy University of Iowa Iowa City IA USA
Connerney, J. E. P. ; Space Research Corporation Annapolis MD USA ; NASA Goddard Space Flight Center Greenbelt MD USA
Nichols, J. D. ; Department of Physics and Astronomy University of Leicester Leicester UK
Palmaerts, Benjamin ; 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)
Hospodarsky, G. B. ; Department of Physics and Astronomy University of Iowa Iowa City IA USA
Mauk, B. H. ; Applied Physics Laboratory Johns Hopkins University Laurel MD USA
Kimura, T. ; Frontier Research Institute for Interdisciplinary Sciences Tohoku University Sendai Japan
Bolton, S. J. ; Southwest Research Institute San Antonio TX USA
✱ These authors have contributed equally to this work.
Language :
English
Title :
On the Relation Between Auroral Morphologies and Compression Conditions of Jupiter's Magnetopause: Observations From Juno and the Hubble Space Telescope
he auroral images are based on observations with the NASA/ESA HST (program HST GO-14105 and GO-14634), obtained at the Space Telescope Science Institute (STScI), which is operated by AURA for NASA. All data are publicly available at STScI via https://archive.stsci.edu/hst/.
The MAG data set is available via https://pds-ppi.igpp.ucla.edu/search/view/?f=yes%26id=pds://PPI/JNO-J-3-FGM-CAL-V1.0, and the Wave data set is available via https://pds-ppi.igpp.ucla.edu/search/view/?f=yes%26id=pds://PPI/JNO-E_J_SS-WAV-2-EDR-V1.0.
The MAG data set is available via https://pds-ppi.igpp.ucla.edu/search/view/?f=yes%26id=pds://PPI/JNO-J-3-FGM-CAL-V1.0, and the Wave data set is available via https://pds-ppi.igpp.ucla.edu/search/view/?f=yes%26id=pds://PPI/JNO-E_J_SS-WAV-2-EDR-V1.0.
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