Space radiation parameters for EUI and the Sun Sensor of Solar Orbiter, ESIO, and JUDE instruments

Abstract

This paper presents predictions of space radiation parameters for four space instruments performed by the Centre Spatial de Liège (ULg -Belgium); EUI, the Extreme Ultra-violet Instrument, on-board the Solar Orbiter platform; ESIO, Extreme-UV solar Imager for Operations, and JUDE, the Jupiter system Ultraviolet Dynamics Experiment, which was proposed for the JUICE platform.For Solar Orbiter platform, the radiation environment is defined by ESA environmental specification and the determination of the parameters is done through ray-trace analyses inside the EUI instrument.For ESIO instrument, the radiation environment of the geostationary orbit is defined through simulations of the trapped particles flux, the energetic solar protons flux and the galactic cosmic rays flux, taking the ECSS standard for space environment as a guideline. Then ray-trace analyses inside the instrument are performed to predict the particles fluxes at the level of the most radiation-sensitive elements of the instrument.For JUICE, the spacecraft trajectory is built from ephemeris files provided by ESA and the radiation environment is modeled through simulations by JOSE (Jovian Specification Environment model) then ray-trace analyses inside the instrument are performed to predict the particles fluxes at the level of the most radiation-sensitive elements of the instrument.

Irradiation of low energy ions damage analysis on multilayers

“…Capping structures are given in Table 1 Two of the ML coatings (one with CL1 and another with CL2) were exposed to a flux of low energy He+ particles (4 keV) based on a dose fluency expected in SOLO mission environment. Alpha-particle doses are derived from data of solar irradiation at 1AU [10] with appropriate scaling to the varying distance at each point of the orbit from the sun, and finally integrated over a time of 4 years (≈ 2.6 × 10 15 ions/cm 2 ) which is expected time length the SOLO satellite will stay around the sun atmosphere. Sample irradiation to He+ ions were performed at the low energy implanter facility, Institute of Ion-beam Physics and Materials Research, HZDR, Dresden (Fig 1).…”