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Observations of the GALILEO radiation environment from MERLIN and SREM instruments. David Rodgers, Hugh Evans , Eamonn Daly, Ali Mohammadzadeh, ESA/ESTEC, Noordwijk, The Netherlands Keith Ryden, Alex Hands, Clive Dyer QinetiQ Ltd, Farnborough, Hampshire, UK Craig Underwood, Ben Taylor
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David Rodgers, Hugh Evans, Eamonn Daly, Ali Mohammadzadeh,
ESA/ESTEC, Noordwijk, The Netherlands
Keith Ryden, Alex Hands, Clive Dyer
QinetiQ Ltd, Farnborough, Hampshire, UK
Craig Underwood,Ben Taylor
University of Surrey, Guildford, UK
23200km altitude circular orbit
3 orbital planes at 56° inclination.
9 equally-spaced operational satellites per plane, plus 1 spare.GALILEO
SREM (>0.8 MeV, >2 MeV and >2.8 MeV)
MERLIN (>0.8MeV, >1.0MeV and >1.6MeV)
13-17 June 2008
MERLIN currents [>0.8 (white), >1.0 (dark green) and >1.6MeV (red)]
and doses [3mm (light green) and 6mm (pink) Al equivalent].
>0.8MeV electrons and “hardness index” plate1/plate3
Plate 3 (>1.6MeV)
FLUMIC v2 comparison
Merlin and SREM are returning good-quality data.
There is good agreement between the datasets.
Spacecraft in the Galileo orbit are subject to frequent space weather enhancements of the outer belt in response to changes in the solar wind.
Electron enhancements are the dominant source of dose.
Hardening of electron spectra during enhancements is typically seen.
These instruments can tell us about space weather and the long term environment.Conclusions
may be too conservative for >0.8MeV electrons
exceeded by CME-related enhancement
consider yearly maximum for FLUMIC, for this orbit
conservative ~0.8 MeV
under-predicts at higher energy
Divergence from the AE-8 model is within model uncertainties (factor 2-3)
A small fraction of one solar has been monitored.
Further monitoring with IOV/FOC are planned
EMU - a Merlin-like instrumentConclusions
and doses [3mm (orange) and 6mm (yellow) Al equivalent].
Data products provided to the Galileo Project
PSI access SREM dataData Processing