Journal article
The High‐Latitude Extension of Jupiter's Io Torus: Electron Densities Measured by Juno Waves
Journal of geophysical research. Space physics, Vol.126(8), e2021JA029195
08/2021
DOI: 10.1029/2021JA029195
Abstract
We present Jovian electron densities measured by the Juno Waves instrument at high‐latitudes (with magnetic latitudes of 50°−80°) on magnetic field lines threading the Io torus and plasma sheet (with M‐shells of 5.5−19) using the first 29 orbits of the Juno mission. We infer electron densities from characteristic frequency cutoffs and resonances in plasma wave spectra. Often more than one of the characteristic frequencies of the plasma can be identified, whose consistency provides credibility to the plasma density estimates. The majority of density measurements are on magnetic field lines threading the Io torus and intersecting Jupiter's ionosphere between Io's M‐shell and the auroral main oval, but there is evidence of density dropouts near and poleward of the auroral oval, which may be important in auroral particle acceleration. Sharp density gradients are found near field lines mapping to the inner edge of the Io torus M‐shells. These observations demonstrate the extension of elevated Io torus densities along field lines to higher latitudes.
Key Points
We present Jovian electron densities at high‐latitudes on magnetic field lines connected to the Io torus and plasma sheet
Sharp density gradients are found near the inner edge of the Io torus M‐shell
Our densities are consistent with partial electron densities measured by Juno's Jovian Auroral Distributions Experiment
Details
- Title: Subtitle
- The High‐Latitude Extension of Jupiter's Io Torus: Electron Densities Measured by Juno Waves
- Creators
- S. S. Elliott - University of IowaA. H. Sulaiman - University of IowaW. S. Kurth - University of IowaJ. Faden - University of IowaF. Allegrini - The University of Texas at San AntonioP. Valek - Southwest Research InstituteJ. E. P. Connerney - Goddard Space Flight CenterR. W. Ebert - Southwest Research InstituteJ. R. Szalay - Princeton UniversityF. Bagenal - Laboratory for Atmospheric and Space PhysicsS. J. Bolton - Southwest Research Institute
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.126(8), e2021JA029195
- DOI
- 10.1029/2021JA029195
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Number of pages
- 13
- Grant note
- National Aeronautics and Space Administration University of Iowa Southwest Research Institute (SWRI) (699041X)
- Language
- English
- Date published
- 08/2021
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984455544702771
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