Le téléscope spatial POEEMA ((Probe of Extreme Multi-Messenger Astrophysics) sera mis en orbite, sauf incident, vers 2030
Il s’agit d’un projet de la Nasa destiné à observer l’atmosphère terrestre d’un point aussi élevé que possible. Le but sera de détecter sur une plus grande surface que ne le font les observatoires terrestres les impacts de particules, protons et neutrinos, qui sont à la source, encore inconnue, des rayons cosmiques. En élargissant la base des triangles d’observations il sera peut-être possible de mieux localiser les sources et de préciser leur nature.
L’enjeu est plus important que l’on ne croirait. Certains scientifiques commencent à se demander s’il ne conviendrait pas de repenser entièrement l’astrophysique actuelle. Il n’est pas exclue qu’elle repose sur des bases aussi éloignées de la « réalité » que ne l’étaient les croyances des civilisations traditionnelles.
Voir https://europesolidaire.eu/2023/06/25/25-06-2023-la-particule-oh-mon-dieu/
The POEMMA (Probe of Extreme Multi-Messenger Astrophysics) observatory
Abstract
The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA) is designed to accurately observe ultra-high-energy cosmic rays (UHECRs) and cosmic neutrinos from space with sensitivity over the full celestial sky. POEMMA will observe the air fluorescence produced by extensive air showers (EASs) from UHECRs and potentially UHE neutrinos above 20 EeV. Additionally, POEMMA has the ability to observe the Cherenkov signal from upward-moving EASs induced by Earth-interacting tau neutrinos above 20 PeV. The POEMMA spacecraft are designed to quickly re-orientate to follow up transient neutrino sources and obtain currently unparalleled neutrino flux sensitivity. Developed as a NASA Astrophysics Probe-class mission, POEMMA consists of two identical satellites flying in loose formation in 525 km altitude orbits. Each POEMMA instrument incorporates a wide field-of-view (45∘) Schmidt telescope with an optical collecting area of over 6 m2. The hybrid focal surface of each telescope includes a fast (1 μs) near-ultraviolet camera for EAS fluorescence observations and an ultrafast (10 ns) optical camera for Cherenkov EAS observations. In a 5-year mission, POEMMA will provide measurements that open new multi-messenger windows onto the most energetic events in the universe, enabling the study of new astrophysics and particle physics at these extreme energies.
Europe Solidaire 