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Session: Heliophysics and the Solar System

Name: Dr. Sigiava Aminalragia-Giamini (SPARC; NKUA)
Coauthors: Jiggens Piers (ESA ESTEC)
Evans Hugh (ESA ESTEC)
Aran Angels (University of Barcelona)
Matthiä Daniel (DLR)
Sandberg Ingmar (SPARC; NKUA)
Anastasiadis Anastasios (NOA)
Daglis Ioannis A. (NKUA; HSC)
Papadimitriou Constantinos (SPARC; NKUA)
Balasis Georgios (NOA)
Type: Oral
Title: Characterization of the Sun-Earth L2 radiation environment using ESA Standard Radiation Environment Monitor (SREM) measurements: Solar Energetic Particle events and Galactic Cosmic Rays
Abstract:

In this work we present results on the analysis of SREM measurements from the HERSCHEL and PLANCK missions in the Sun-Earth Lagrange 2 point (L2). The datasets from these two missions are unique as over their duration they measured the L2 radiation environment which is poorly characterised so far, but of prime interest for important current and future missions, such as the James Webb Space Telescope and the ATHENA X-ray Telescope. The two main sources of particle radiation in L2 are Solar Energetic Particle (SEP) events and Galactic Cosmic Rays (GCRs). We have applied an advanced artificial intelligence method on the HERSCHEL and PLANCK SREM measurements for the derivation of high quality particle fluxes during identified SEP events. We present SREM-derived SEP proton fluxes up to energies of 1 MeV and discuss the SEP characteristics in L2. Comparisons of our results to concurrent data from Earth-orbiting missions are shown. Moreover, we also resolve Galactic Cosmic Rays (GCR) spectra from SREM measurements, something which has not been done so far. GCR fluxes for protons as well as alpha (helium) particle are successfully derived, and we show comparisons of our results to established GCR models and data.