Journal article
Analysis of Whistler‐Mode and Z‐Mode Emission in the Juno Primary Mission
Journal of geophysical research. Space physics, Vol.126(11), e2021JA029885
11/2021
DOI: 10.1029/2021JA029885
Abstract
At the end of the Juno primary mission, we report observations of whistler mode chorus and Z‐mode emission. The Juno orbits are evolving and much better coverage of the whistler mode chorus source region has resulted since the earlier surveys. Bursty chorus emission extending to ∼30° latitude and to frequencies less than the lower hybrid frequency near the source region imply high electron energies (>100 keV). Average chorus intensity levels peak at ∼10−3 nT2 near M‐shell of 8–9 and magnetic latitude of ∼5°. Z‐mode emission is identified at higher latitudes generally near and inward of the Io torus with intensity levels as much as two orders of magnitude higher than Z‐mode emissions observed at Saturn. Inferred source regions for the Z‐mode are consistent with the inner edge of the Io torus and with auroral field lines that may also support Jovian kilometric and decametric emission. Parametric fitting functions are evaluated for both whistler mode chorus and Z‐mode, describing wave intensity as a function of frequency, magnetic latitude, and M‐shell. Both whistler mode and Z‐mode waves may have significant impact on electron scattering and acceleration at Jupiter as recent models indicate.
Key Points
Jovian whistler‐mode chorus and Z‐mode intensity distributions are surveyed and analyzed at the end of the Juno primary mission
Bursty low frequency whistler mode emission implies electrons energies exceeding 100 keV
Jovian whistler mode chorus and Z‐mode intensity are parametrically fit to frequency, M‐shell, and mag‐latitude
Details
- Title: Subtitle
- Analysis of Whistler‐Mode and Z‐Mode Emission in the Juno Primary Mission
- Creators
- J. D. Menietti - University of IowaT. F. Averkamp - University of IowaW. S. Kurth - University of IowaM. Imai - National Institute of Technology, Niihama CollegeJ. B. Faden - University of IowaG. B. Hospodarsky - University of IowaO. Santolik - Charles UniversityG. Clark - Johns Hopkins University Applied Physics LaboratoryF. Allegrini - Southwest Research InstituteS. S. Elliott - University of IowaA. H. Sulaiman - University of IowaS. J. Bolton - Southwest Research Institute
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.126(11), e2021JA029885
- DOI
- 10.1029/2021JA029885
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 17
- Grant note
- National Aeronautics and Space Administration (NASA) (80NSSC19K1262) NASA New Frontiers Program for Juno / Southwest Research Inst Southwest Research Institute (SWRI) (699041X) NASA New Frontiers Program for Juno Inter‐Excellence Project (LTAUSA17070) Japan Society for the Promotion of Science KAKENHI (JP20K22371)
- Language
- English
- Date published
- 11/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455360402771
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