Generation of the Jovian hectometric radiation: First lessons from Juno - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2017

Generation of the Jovian hectometric radiation: First lessons from Juno

, , , , , , , , , , (1) , , , , , (1)
1
J. L. Zink
  • Function : Author
R. J. Wilson
  • Function : Author
S. Weidner
  • Function : Author
J. R. Szalay
  • Function : Author
S. Levin
M. Imai
  • Function : Author
R. W. Ebert
  • Function : Author
J. Connerney
  • Function : Author
S. Bolton
F. Bagenal
  • Function : Author
W. S. Kurth
  • Function : Author
P. W. Valek
  • Function : Author
D. J. Mccomas
  • Function : Author
F. Allegrini
  • Function : Author

Abstract

Using Juno plasma and wave and magnetic observations (JADE and Waves and MAG instruments), the generation mechanism of the Jovian hectometric radio emission is analyzed. It is shown that suitable conditions for the cyclotron maser instability (CMI) are observed in the regions of the radio sources. Pronounced loss cone in the electron distributions are likely the source of free energy for the instability. The theory reveals that sufficient growth rates are obtained from the distribution functions that are measured by the JADE-Electron instrument. The CMI would be driven by upgoing electron populations at 5-10 keV and 10-30° pitch angle, the amplified waves propagating at 82°-87° from the B field, a fraction of a percent above the gyrofrequency. Typical e-folding times of 10-4 s are obtained, leading to an amplification path of 1000 km. Overall, this scenario for generation of the Jovian hectometric waves differs significantly from the case of the auroral kilometric radiation at Earth.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2017 - Louarn - Generation of the Jovian hectometric radiation First lessons from Juno.pdf (999.01 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03677005 , version 1 (24-05-2022)

Licence

Copyright

Identifiers

Cite

J. L. Zink, R. J. Wilson, S. Weidner, J. R. Szalay, S. Levin, et al.. Generation of the Jovian hectometric radiation: First lessons from Juno. Geophysical Research Letters, 2017, 44, pp.4439-4446. ⟨10.1002/2017GL072923⟩. ⟨insu-03677005⟩
8 View
3 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More