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

Journal Article · · Journal of Geophysical Research. Space Physics
DOI:https://doi.org/10.1029/2022ja031199· OSTI ID:2422181
 [1];  [2];  [3];  [3];  [3];  [4];  [5];  [6]
  1. Univ. of Iowa, Iowa City, IA (United States); OSTI
  2. Univ. of Maryland, College Park, MD (United States)
  3. Univ. of Iowa, Iowa City, IA (United States)
  4. Southwest Research Institute, San Antonio, TX (United States); Univ. of Texas at San Antonio, TX (United States)
  5. Johns Hopkins Univ., Laurel, MD (United States). Applied Physics Laboratory
  6. Southwest Research Institute San Antonio TX USA
+ Show Author Affiliations
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.
Research Organization:
Univ. of Maryland, College Park, MD (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0022963
OSTI ID:
2422181
Journal Information:
Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 5 Vol. 128; ISSN 2169-9380
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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