There is a newer version of the record available.

Published October 9, 2021 | Version 1.2.0
Dataset Open

Analysis of Whistler-Mode and Z-Mode Emission in the Juno Primary Mission

Creators

  • 1. Department of Physics and Astronomy, University of Iowa, Iowa City, IA, USA
  • 2. Department of Electrical Engineering and Information Science, National Institute of Technology (KOSEN), Niihama College, Niihama, Ehime, Japan
  • 3. Department of Space Physics, IAP, CAS, Prague, Czech Republic; Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
  • 4. Applied Physics Laboratory, The Johns Hopkins University, Laurel MD, USA
  • 5. Southwest Research Institute, San Antonio, TX, USA; Physics and Astronomy Department, University of Texas at San Antonio, San Antonio, TX, USA
  • 6. Department of Physics, University of Minnesota, Minneapolis, MN, USA
  • 7. Southwest Research Institute, San Antonio, TX, USA

Description

THIS VERSION IS DEPRECATED.  IT CONTAINS UNNECESSARY UNRELATED DATA.  VERSION 1.1.0 IS CORRECT.

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.

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.

Notes

Version 1.2.0 is deprecated and contains unnecessary unrelated data. Version 1.1.0 is correct.

Files

Menietti_Analysis_Whistler-Mode_Z-Mode-1.2.0.zip

Files (26.5 MB)

Name Size Download all
md5:4e84cce74d08a5afcd278b7ea89410f1
26.5 MB Preview Download