Wave and Particle Analysis of Z‐Mode and O‐Mode Emission in the Jovian Inner Magnetosphere

J. D. Menietti; P. H. Yoon; T. F. Averkamp; W. S. Kurth; J. B. Faden; F. Allegrini; P. Kollmann; S. J. Bolton

doi:10.1029/2022JA031199

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Wave and Particle Analysis of Z‐Mode and O‐Mode Emission in the Jovian Inner Magnetosphere

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Wave and Particle Analysis of Z‐Mode and O‐Mode Emission in the Jovian Inner Magnetosphere

J. D. Menietti, P. H. Yoon, T. F. Averkamp, W. S. Kurth, J. B. Faden, F. Allegrini, P. Kollmann and S. J. Bolton

Journal of geophysical research. Space physics, Vol.128(5), e2022JA031199

05/2023

DOI: 10.1029/2022JA031199

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Abstract

We report some of the most intense Z-mode and O-mode observations obtained by the Juno spacecraft while in orbit about Jupiter in a low to mid-latitude region near the inner edge of the Io torus. We have been able to estimate the density of the plasma in this region based on the lower frequency cutoff of the observed Z-mode emission. The results are compatible with the electron density measurements of the Jovian Auroral Distributions Experiment (JADE), on board the Juno spacecraft, if we account for unmeasured cold plasma. Direction-finding measurements indicate that the Z- and O-mode emission have distinct source regions. We have also used the measured phase space density of the JADE and the Jupiter energetic particle detector instruments to calculate estimated local growth rates of the observed O-mode and Z-mode emission assuming a loss cone instability and quasilinear analysis. The results suggest the emissions were observed near, but not within, a source region, and the free energy source is consistent with a loss cone. We have thus carried out the quasilinear wave analysis of the assumed remote Z- and O-mode wave growths. It is shown that the remotely generated waves, propagated through an inhomogeneous medium to the satellite location, may account for the observed wave characteristics. The importance of Z-mode in accelerating electrons in the inner Jovian magnetosphere makes these new wave mode confirmations at Jupiter of particular interest.

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Details

Title: Subtitle: Wave and Particle Analysis of Z‐Mode and O‐Mode Emission in the Jovian Inner Magnetosphere
Creators: J. D. Menietti - University of Iowa, Physics and Astronomy
P. H. Yoon - University of Maryland, College Park
T. F. Averkamp - University of Iowa
W. S. Kurth - University of Iowa
J. B. Faden - University of Iowa
F. Allegrini - Southwest Research Institute
P. Kollmann - Johns Hopkins University Applied Physics Laboratory
S. J. Bolton - Southwest Research Institute
Resource Type: Journal article
Publication Details: Journal of geophysical research. Space physics, Vol.128(5), e2022JA031199
DOI: 10.1029/2022JA031199
ISSN: 2169-9380
eISSN: 2169-9402
Publisher: Wiley
Language: English
Date published: 05/2023
Academic Unit: Physics and Astronomy
Record Identifier: 9984414658202771

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