Home » de Soria-Santacruz et al. 2017

Interactions between energetic electrons and realistic whistler mode waves in the Jovian magnetosphere

de Soria-Santacruz M., Y. Y. Shprits, A. Drozdov, J. D. Menietti, H. B. Garrett, H. Zhu, A. C. Kellerman, R. B. Horne, (2017), Interactions between energetic electrons and realistic whistler mode waves in the Jovian magnetosphere, J. of Geophys. Res. [Space Physics], 122, 5355-5364, doi:10.1002/2017JA023975

Abstract

Abstract The role of plasma waves in shaping the intense Jovian radiation belts is not well understood. In this study we use a realistic wave model based on an extensive survey from the Plasma Wave Investigation on the Galileo spacecraft to calculate the effect of pitch angle and energy diffusion on Jovian energetic electrons due to upper and lower band chorus. Two Earth-based models, the Full Diffusion Code and the Versatile Electron Radiation Belt code, are adapted to the case of the Jovian magnetosphere and used to resolve the interaction between chorus and electrons at L = 10. We also present a study of the sensitivity to the latitudinal wave coverage and initial electron distribution. Our analysis shows that the contribution to the electron dynamics from upper band chorus is almost negligible compared to that from lower band chorus. For 100 keV electrons, we observe that diffusion leads to redistribution of particles toward lower pitch angles with some particle loss, which could indicate that radial diffusion or interchange instabilities are important. For energies above >500 keV, an initial electron distribution based on observations is only weakly affected by chorus waves. Ideally, we would require the initial electron phase space density before transport takes place to assess the importance of wave acceleration, but this is not available. It is clear from this study that the shape of the electron phase space density and the latitudinal extent of the waves are important for both electron acceleration and loss.

Authors (sorted by name)

de Soria-Santacruz Drozdov Garrett Horne Kellerman Menietti Shprits Zhu

Journal / Conference

Journal Of Geophysical Research (Space Physics)

Acknowledgments

The research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. The University of California Los Angeles and the University of Iowa acknowledge support from a NASANNX11AM36G grant. We acknowledge Galileo PWI data obtained from the University of Iowa and available in the Planetary Data System (https://pds.nasa.gov/).

Grants

NNX11AM36G

Bibtex

@article{doi:10.1002/2017JA023975,
author = {de Soria-Santacruz, M. and Shprits, Y. Y. and Drozdov, A. and Menietti, J. D. and Garrett, H. B. and Zhu, H. and Kellerman, A. C. and Horne, R. B.},
title = {Interactions between energetic electrons and realistic whistler mode waves in the Jovian magnetosphere},
journal = {Journal of Geophysical Research: Space Physics},
volume = {122},
year={2017},
number = {5},
pages = {5355-5364},
keywords = {wave-particle interactions, Jovian magnetosphere, chorus waves},
doi = {10.1002/2017JA023975},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2017JA023975},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2017JA023975},
abstract = {Abstract The role of plasma waves in shaping the intense Jovian radiation belts is not well understood. In this study we use a realistic wave model based on an extensive survey from the Plasma Wave Investigation on the Galileo spacecraft to calculate the effect of pitch angle and energy diffusion on Jovian energetic electrons due to upper and lower band chorus. Two Earth-based models, the Full Diffusion Code and the Versatile Electron Radiation Belt code, are adapted to the case of the Jovian magnetosphere and used to resolve the interaction between chorus and electrons at L = 10. We also present a study of the sensitivity to the latitudinal wave coverage and initial electron distribution. Our analysis shows that the contribution to the electron dynamics from upper band chorus is almost negligible compared to that from lower band chorus. For 100 keV electrons, we observe that diffusion leads to redistribution of particles toward lower pitch angles with some particle loss, which could indicate that radial diffusion or interchange instabilities are important. For energies above >500 keV, an initial electron distribution based on observations is only weakly affected by chorus waves. Ideally, we would require the initial electron phase space density before transport takes place to assess the importance of wave acceleration, but this is not available. It is clear from this study that the shape of the electron phase space density and the latitudinal extent of the waves are important for both electron acceleration and loss.}
}