Data Exploitation of New Galileo Environmental Monitoring Units
2019
The radiation environment of the Galileo spacecraft
is severe and poorly characterized. The Galileo orbit takes the
spacecraft through the heart of the outer radiation belt, while the
low levels of geomagnetic shielding throughout the orbit expose
the spacecraft to intermittent intense fluxes of protons during
Solar Energetic Particle Events. In the Galileo constellation, two
Environmental Monitoring Units (EMU) are currently flying in
two different orbital planes. These units monitor the radiation
environment and provide critical information related to hazards
for the host spacecraft and its payload. In this work, we present
results from the analysis of the surface charge collecting plates
and of the proton telescope sensors. The performed numerical
calibration of the EMU sensors and the application of novel
unfolding and in-flight cross-calibration techniques allow the
calculation of high quality proton and electron differential fluxes.
The creation of a high-quality, long-term EMU electron flux
dataset, is a step forward towards the improved characterization
of MEO environment through the update of existing or the
development of new radiation environment models.
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