Journal article
On the Relation Between Auroral Morphologies and Compression Conditions of Jupiter's Magnetopause: Observations From Juno and the Hubble Space Telescope
Journal of geophysical research. Space physics, Vol.127(10), e2021JA029894
10/2022
DOI: 10.1029/2021JA029894
Abstract
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.
Details
- Title: Subtitle
- On the Relation Between Auroral Morphologies and Compression Conditions of Jupiter's Magnetopause: Observations From Juno and the Hubble Space Telescope
- Creators
- Z. H. Yao - Institute of Geology and GeophysicsB. Bonfond - University of LiègeD. Grodent - University of LiègeE. Chane - KU LeuvenW. R. Dunn - University College LondonW. S. Kurth - University of IowaJ. E. P. Connerney - Goddard Space Flight CenterJ. D. Nichols - University of LeicesterB. Palmaerts - University of LiègeR. L. Guo - Shandong UniversityG. B. Hospodarsky - University of IowaB. H. Mauk - Johns Hopkins University Applied Physics LaboratoryT. Kimura - Tokyo University of ScienceS. J. Bolton - Southwest Research Institute
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.127(10), e2021JA029894
- DOI
- 10.1029/2021JA029894
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Publisher
- Amer Geophysical Union
- Number of pages
- 17
- Grant note
- Belgian Federal Science Policy Office (BELSPO) via the PRODEX Programme of ESA 2021YFA0718600 / National Key R&D Program of China 42074211 / National Science Foundation of China; National Natural Science Foundation of China (NSFC) 699041X / NASA; National Aeronautics & Space Administration (NASA) International Space Science Institute in Beijing (ISSI-BJ) IGGCAS-201904 / Key Research Program of the Institute of Geology Geophysics CAS NASA's New Frontiers Program for Juno Southwest Research Institute
- Language
- English
- Date published
- 10/2022
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455278002771
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