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Galileo interim radiation electron model : update—2012

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dc.contributor.author Garrett, H. B.
dc.contributor.author Kokorowski, M.
dc.contributor.author Jun, I.
dc.contributor.author Evans, R. W. en_US
dc.date.accessioned 2012-04-03T20:39:33Z
dc.date.available 2012-04-03T20:39:33Z
dc.date.issued 2012-03
dc.identifier.uri http://hdl.handle.net/2014/42026
dc.description.abstract Measurements of the high-energy, omnidirectional electron environment, and magnetic field by the Galileo spacecraft Energetic Particle Detector (EPD) and Magnetometer (MAG) were used to revise the original Divine and GIRE models of Jupiter’s trapped electron radiation in the jovian equatorial plane. 10-minute averages of the EPD data were averaged to provide an omni-directional differential flux spectrum at 0.238, 0.416, 0.706, 1.5, 2.0, 11.0, and 31 MeV (the latter based on estimates by Pioneer 10 and 11) in the jovian equatorial plane as a function of radial distance. This model has been combined with the original Divine model and recent synchrotron observations of jovian high energy electrons inside L = 4 to yield estimates of the radiation environment from ~1 to ~50 Jupiter radii (1 jovian radius = 71,400 km). The revised model, referred to here as the Galileo Interim Radiation Electron model-Version 2 (or GIRE2), is intended to address several concerns with the original Divine/GIRE model. In particular, there were noticeable discontinuities at the boundaries between the GIRE and the Divine models. Also, the GIRE model did not extend out past L=~16 and depended on the original Divine model for pitch angle distributions. The new GIRE2 model consists of an inner trapped omnidirectional model between L = 7.2 and 22.5 that has been modified to smoothly join onto the original Divine model between L = 7.2 and 10.5 and onto a GIRE2 plasma sheet model between L = 17 and 25. The latter component is a function of jovian radius and height above the plasma sheet as given by the Khurana magnetic field model. The model, the steps leading to its creation, and relevant issues and concerns are discussed in detail in the report. The GIRE2 model, like its predecessor GIRE, represents a step forward in the study of the jovian radiation environment and is a useful and valuable tool for estimating that environment for future missions to Jupiter. en_US
dc.description.sponsorship NASA/JPL en_US
dc.language.iso en_US en_US
dc.publisher Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2012. en_US
dc.relation.ispartofseries JPL Publication en_US
dc.relation.ispartofseries 12-9 en_US
dc.subject Jupiter Radiation Belts en_US
dc.subject Galileo spacecraft Energetic Particle Detector (EPD) en_US
dc.subject Galileo Spacecraft en_US
dc.subject Europa en_US
dc.subject High Energy Electrons, en_US
dc.title Galileo interim radiation electron model : update—2012 en_US
dc.type Technical Report en_US
dc.subject.NASATaxonomy Space Radiation en_US


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