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Updating the Jovian Proton Radiation Environment - 2015Since publication in 1983 by N. Divine and H. Garrett, the Jet Propulsion Laboratory's plasma and radiation models have been the design standard for NASA's missions to Jupiter. These models consist of representations of the cold plasma and electrons, the warm and auroral electrons and protons, and the radiation environment (electron, proton, and heavy ions). To date, however, the high-energy proton model has been limited to an L-shell of 12. With the requirement to compute the effects of the high energy protons and other heavy ions on the proposed Europa mission, the extension of the high energy proton model from approximately 12 L-shell to approximately 50 L-shell has become necessary. In particular, a model of the proton environment over that range is required to estimate radiation effects on the solar arrays for the mission. This study describes both the steps taken to extend the original Divine proton model out to an approximately 50 L-shell and the resulting model developed to accomplish that goal. In addition to hydrogen, the oxygen, sulfur, and helium heavy ion environments have also been added between approximately 6 L-shell and approximately 50 L-shell. Finally, selected examples of the model's predictions are presented to illustrate the uses of the tool.
Document ID
20160009376
Document Type
Other
Authors
Garrett, Henry (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Martinez-Sierra, Luz Maria (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Evans, Robin (MORI Associates, Inc. Rockville, MD, United States)
Date Acquired
July 26, 2016
Publication Date
October 1, 2015
Subject Category
Lunar and Planetary Science and Exploration
Space Radiation
Report/Patent Number
JPL Doc. No. URS255115
JPL-Publ-15-09
Funding Number(s)
WBS: WBS 105473-03.13.01
CONTRACT_GRANT: NNN12AA01C
PROJECT: Project 105473
TASK: Task Order 5.5130.06
TASK: Task Order 071116-104861
Distribution Limits
Public
Copyright
Public Use Permitted.

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