Home » de Soria-Santacruz et al. 2016

An empirical model of the high-energy electron environment at Jupiter

de Soria-Santacruz M., H. B. Garrett, R. W. Evans, I. Jun, W. Kim, C. Paranicas, A. Drozdov, (2016), An empirical model of the high-energy electron environment at Jupiter, J. of Geophys. Res. [Space Physics], 121, 9732-9743, doi:10.1002/2016JA023059

Abstract

Abstract We present an empirical model of the energetic electron environment in Jupiter's magnetosphere that we have named the Galileo Interim Radiation Electron Model version-2 (GIRE2) since it is based on Galileo data from the Energetic Particle Detector (EPD). Inside 8RJ, GIRE2 adopts the previously existing model of Divine and Garrett because this region was well sampled by the Pioneer and Voyager spacecraft but poorly covered by Galileo. Outside of 8RJ, the model is based on 10 min averages of Galileo EPD data as well as on measurements from the Geiger Tube Telescope on board the Pioneer spacecraft. In the inner magnetosphere the field configuration is dipolar, while in the outer magnetosphere it presents a disk-like structure. The gradual transition between these two behaviors is centered at about 17RJ. GIRE2 distinguishes between the two different regions characterized by these two magnetic field topologies. Specifically, GIRE2 consists of an inner trapped omnidirectional model between 8 to 17RJ that smoothly joins onto the original Divine and Garrett model inside 8RJ and onto a GIRE2 plasma sheet model at large radial distances. The model provides a complete picture of the high-energy electron environment in the Jovian magnetosphere from ∼1 to 50RJ. The present manuscript describes in great detail the data sets, formulation, and fittings used in the model and provides a discussion of the predicted high-energy electron fluxes as a function of energy and radial distance from the planet.

Authors (sorted by name)

de Soria-Santacruz Drozdov Evans Garrett Jun Kim Paranicas

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. Contact M. de Soria‐Santacruz (Maria.de.Soria‐Santacruz.Pich@jpl.nasa.gov) about model availability. We acknowledge Galileo EPD data obtained from the Johns Hopkins University Applied Physics Laboratory (JHU/APL) and available in the Planetary Data System (https://pds.nasa.gov/), and Pioneer GTT data also from the Planetary Data System. The authors would like to acknowledge Jack Connerney and Krishan Khurana for providing their magnetic field models as well as for many useful discussions.

Bibtex

@article{doi:10.1002/2016JA023059,
author = {de Soria-Santacruz, M. and Garrett, H. B. and Evans, R. W. and Jun, I. and Kim, W. and Paranicas, C. and Drozdov, A.},
title = {An empirical model of the high-energy electron environment at Jupiter},
year={2016},
journal = {Journal of Geophysical Research: Space Physics},
volume = {121},
number = {10},
pages = {9732-9743},
keywords = {Jupiter's magnetosphere, high-energy electrons},
doi = {10.1002/2016JA023059},
url = {https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016JA023059},
eprint = {https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1002/2016JA023059},
abstract = {Abstract We present an empirical model of the energetic electron environment in Jupiter's magnetosphere that we have named the Galileo Interim Radiation Electron Model version-2 (GIRE2) since it is based on Galileo data from the Energetic Particle Detector (EPD). Inside 8RJ, GIRE2 adopts the previously existing model of Divine and Garrett because this region was well sampled by the Pioneer and Voyager spacecraft but poorly covered by Galileo. Outside of 8RJ, the model is based on 10 min averages of Galileo EPD data as well as on measurements from the Geiger Tube Telescope on board the Pioneer spacecraft. In the inner magnetosphere the field configuration is dipolar, while in the outer magnetosphere it presents a disk-like structure. The gradual transition between these two behaviors is centered at about 17RJ. GIRE2 distinguishes between the two different regions characterized by these two magnetic field topologies. Specifically, GIRE2 consists of an inner trapped omnidirectional model between 8 to 17RJ that smoothly joins onto the original Divine and Garrett model inside 8RJ and onto a GIRE2 plasma sheet model at large radial distances. The model provides a complete picture of the high-energy electron environment in the Jovian magnetosphere from ∼1 to 50RJ. The present manuscript describes in great detail the data sets, formulation, and fittings used in the model and provides a discussion of the predicted high-energy electron fluxes as a function of energy and radial distance from the planet.}
}