Energetic particle contamination in STIX during Solar Orbiter's passage through Earth's radiation belts and an interplanetary shock
IEEE Transactions on Nuclear Science(2024)
摘要
The Spectrometer/Telescope for Imaging X-rays (STIX) is a hard X-ray imaging
spectrometer on board the ESA and NASA heliospheric mission Solar Orbiter. STIX
has been operational for three years and has observed X-ray emission from
35,000 solar flares. Throughout its lifetime, Solar Orbiter has been
frequently struck by a high flux of energetic particles usually of flare
origin, or from coronal mass ejection shocks. These Solar Energetic Particles
(SEPs) are detected on board by the purpose-built energetic particle detector
instrument suite. During SEP events, the X-ray signal is also contaminated in
STIX. This work investigates the effect of these particles on the STIX
instrument for two events. The first event occurred during an interplanetary
shock crossing and the second event occurred when Solar Orbiter passed through
Earth's radiation belts while performing a gravity assist maneuver. The induced
spectra consist of tungsten fluorescence emission lines and secondary
Bremsstrahlung emission produced by incident particles interacting with
spacecraft components. For these two events, we identify > 100 keV electrons as
significant contributors to the contamination via Bremsstrahlung emission and
tungsten fluorescence.
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关键词
Radiation Environments,SEPs,Space Instrumentation,X-rays
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