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Ultralow‐Frequency Waves in Driving Jovian Aurorae Revealed by Observations from HST and Juno

Pan, D; Yao, Z; Manners, H; Dunn, W; Bonfond, B; Grodent, D; Zhang, B; ... Wei, Y; + view all (2021) Ultralow‐Frequency Waves in Driving Jovian Aurorae Revealed by Observations from HST and Juno. Geophysical Research Letters , 48 (5) , Article e2020GL091579. 10.1029/2020gl091579. Green open access

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Abstract

Large-scale electrical currents and Alfvénic waves are the two main drivers responsible for producing planetary aurorae. The relative contribution of each process is a central question in terrestrial auroral science, and poorly understood for other planets due to the relatively rare opportunity of in-situ spacecraft measurements. Here, we present observations of Jupiter's aurorae from the Hubble Space Telescope (HST) contemporaneous with Juno magnetometer measurements in the magnetosphere. For three successive days, we found that the magnetospheric ultralow-frequency (ULF) wave activity (with periods of 1–60 min) was correlated with auroral power. This was especially true for the Alfvénic modes. We further performed a statistical analysis based on HST visits during Juno's third and seventh orbit, which revealed a systematic correlation between ULF wave and auroral activity. Our results imply that Alfvénic wave power could be an important source in driving Jupiter's aurorae, as theoretically predicted.

Type: Article
Title: Ultralow‐Frequency Waves in Driving Jovian Aurorae Revealed by Observations from HST and Juno
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2020gl091579
Publisher version: https://doi.org/10.1029/2020GL091579
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10122068
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