Journal article
Generation and Impacts of Whistler‐Mode Waves During Energetic Electron Injections in Jupiter's Outer Radiation Belt
Journal of geophysical research. Space physics, Vol.129(7), e2024JA032624
07/2024
DOI: 10.1029/2024JA032624
Abstract
Abstract Energetic particle injections are commonly observed in Jupiter's magnetosphere and have important impacts on the radiation belts. We evaluate the roles of electron injections in the dynamics of whistler‐mode waves and relativistic electrons using Juno measurements and wave‐particle interaction modeling. The Juno spacecraft observed injected electron flux bursts at energies up to 300 keV at M shell ∼11 near the magnetic equator during perijove‐31. The electron injections are related to chorus wave bursts at 0.05–0.5 f ce frequencies, where f ce is the electron gyrofrequency. The electron pitch angle distributions are anisotropic, peaking near 90° pitch angle, and the fluxes are high during injections. We calculate the whistler‐mode wave growth rates using the observed electron distributions and linear theory. The frequency spectrum of the wave growth rate is consistent with that of the observed chorus magnetic intensity, suggesting that the observed electron injections provide free energy to generate whistler‐mode chorus waves. We further use quasilinear theory to model the impacts of chorus waves on 0.1–10 MeV electrons. Our modeling shows that the chorus waves could cause the pitch angle scattering loss of electrons at <1 MeV energies and accelerate relativistic electrons at multiple MeV energies in Jupiter's outer radiation belt. The electron injections also provide an important seed population at several hundred keV energies to support the acceleration to higher energies. Our wave‐particle interaction modeling demonstrates the energy flow from the electron injections to the relativistic electron population through the medium of whistler‐mode waves in Jupiter's outer radiation belt.
Key Points Chorus wave generation due to electron injections is demonstrated by their correlative occurrence and wave instability analysis Whistler‐mode waves scatter electrons into the loss cone and cause diffuse auroral precipitation with intensities of 60–160 erg/cm 2 /s Chorus waves cause local acceleration of MeV electrons in several days, further aided by the seed electron population from injections
Details
- Title: Subtitle
- Generation and Impacts of Whistler‐Mode Waves During Energetic Electron Injections in Jupiter's Outer Radiation Belt
- Creators
- Q. Ma - University of California, Los AngelesW. Li - Boston UniversityX.‐J. Zhang - The University of Texas at DallasJ. Bortnik - University of California, Los AngelesX.‐C. Shen - Boston UniversityA. Daly - Boston UniversityW. S. Kurth - University of IowaB. H. Mauk - Johns Hopkins University Applied Physics LaboratoryF. Allegrini - The University of Texas at San AntonioJ. E. P. Connerney - Goddard Space Flight CenterF. Bagenal - University of Colorado BoulderS. J. Bolton - Southwest Research Institute
- Resource Type
- Journal article
- Publication Details
- Journal of geophysical research. Space physics, Vol.129(7), e2024JA032624
- DOI
- 10.1029/2024JA032624
- ISSN
- 2169-9380
- eISSN
- 2169-9402
- Language
- English
- Date published
- 07/2024
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984656542402771
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