000005323 001__ 5323
000005323 005__ 20210304161848.0
000005323 037__ $$aCTALK-2021-0051
000005323 100__ $$aGrimani, Catia 
000005323 245__ $$aA Radiation Environmental Study for the Metis Coronagraph on board Solar Orbiter
000005323 260__ $$c2020
000005323 269__ $$c2020-12-14
000005323 520__ $$aThe solar cycle 24 was the weakest of the last hundred years. All predictions available in the literature for the solar cycle 25 indicate a similar or even weaker period of solar activity. As a result, the highest galactic cosmic-ray flux of the last century will strike the Solar Orbiter spacecraft along its orbit. Conversely, only one solar energetic particle event (SEP) per year (average predictions) is expected during the cruise phase of the mission in the fluence range 106-107 protons cm-2 above 30 MeV. An instrument dedicated radiation environmental study will be carried out for Metis, the coronagraph on board Solar Orbiter. Pre-launch Monte Carlo simulations aiming to estimate the overall dose absorbed by the Cerium treated polarimeter lenses indicated an average dose absorption of 2000 Gy for the extended mission, while the lenses showed a few % transmittance loss with a 106 Gy of gamma radiation. Monte Carlo simulations will be also performed to study energetic particle single hits and tracks in the images of the visible light and ultraviolet detectors. On the other hand, dark images provide precious clues for cosmic-ray monitoring and images background estimates for both Metis and EUI (Extreme-Ultraviolet Imager) detectors. Collaboration with the EPD (Energetic Particle Detector) instrument scientists and data from cosmic-ray experiments in orbit during the Solar Orbiter mission will allow us to study cosmic-ray variations along the spacecraft orbit and their effects on the instrument performance.
000005323 594__ $$aNO
000005323 700__ $$aAndretta, Vincenzo 
000005323 700__ $$aChioetto, Paolo 
000005323 700__ $$aDa Deppo, Vania 
000005323 700__ $$aFabi, Michele 
000005323 700__ $$aGissot, Samuel 
000005323 700__ $$aNaletto, Giampiero 
000005323 700__ $$aPlainaki, Christina 
000005323 700__ $$aRomoli, Marco
000005323 700__ $$aSpadaro, Daniele 
000005323 700__ $$aStangalini, Marco
000005323 700__ $$aTelloni, Daniele 
000005323 773__ $$tAGU Fall Meeting 2020, online
000005323 8560_ $$fsamuel.gissot@observatoire.be
000005323 906__ $$aContributed
000005323 980__ $$aCTALKCONT