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Survey of whistler mode chorus intensity at Jupiter
Author(s) -
Menietti J. D.,
Groene J. B.,
Averkamp T. F.,
Horne R. B.,
Woodfield E. E.,
Shprits Y. Y.,
SoriaSantacruz Pich M.,
Gurnett D. A.
Publication year - 2016
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2016ja022969
Subject(s) - jovian , chorus , physics , jupiter (rocket family) , van allen radiation belt , magnetosphere , astrophysics , equator , intensity (physics) , astronomy , saturn , geophysics , computational physics , latitude , magnetic field , planet , spacecraft , art , literature , quantum mechanics
Whistler mode chorus emission is important in the acceleration of electrons and filling of the radiation belts at Jupiter. In this work chorus magnetic intensity levels (frequency‐integrated spectral density, P B ) at Jupiter are comprehensively binned and parameterized. The frequency range of chorus under study extends from the lower hybrid frequency, f lh , to f ceq /2 and f ceq /2 < f < 0.8 f ceq , where f ceq is the cyclotron frequency mapped to the magnetic equator. The goal is to obtain a quantized distribution of magnetic intensity for use in stochastic modeling efforts. Parametric fits of magnetic plasma wave intensity are obtained, including P B versus frequency, latitude, and L shell. The results indicate that Jupiter chorus occurrence probability and intensity are higher than those at Saturn, reaching values observed at Earth. Jovian chorus is observed over most local times, confined primarily to the range 8 < L < 15, outside the high densities of the Io torus. The largest intensity levels are seen on the dayside; however, the sampling of chorus on the nightside is much less than on the dayside. Peak intensities occur near the equator with a weak dependence on magnetic latitude, λ . We conclude that Jovian chorus average intensity levels are approximately an order of magnitude lower than those at Earth. In more isolated regions the intensities are comparable to those observed at Earth. The spatial range of the chorus emissions extends beyond that assumed in previous Jovian global diffusive models of wave‐particle electron acceleration.