Comparison of Artemis I Radiation Measurements with Orion EFT-1 and ISS Data

Comparison of Artemis I Radiation Measurements with Orion EFT-1 and ISS Data Ramona Gaza, Ph.D. On behalf of the Space Radiation Analysis Group Leidos, Space Exploration and Mission Operations, Houston, TX 77058, USA Space Radiation Analysis Group, NASA Johnson Space Center, Houston, TX 77058, USA Corresponding author: ramona.gaza-1@nasa.gov The first major spaceflight of NASA's Artemis program to return humans to the Moon, the Artemis I uncrewed mission, has been flown successfully November 16 - December 11, 2022, for a total mission duration of 25.5 days. The Space Radiation Analysis Group (SRAG) at NASA Johnson Space Center (JSC) has provided a suit of passive radiation detectors and active instruments in support of multiple Artemis I Science Payloads. The same passive technology has been flying in support of the International Space Station (ISS) for more than 20 years and has been successfully flown on the NASA Orion Exploration Flight Test 1 (EFT-1) launched on December 5, 2014, with a duration of only 4.5 hours. The Orion EFT-1 trajectory included two orbits around the Moon with a high apogee which was different from the from the Artemis I distant retrograde orbit trajectory, resulting in a significant radiation exposure difference through the Van Allen belts. On ISS, the average daily dose is modulated by the 11-year solar cycle and solar minimum dose values will differ from solar maximum daily doses. This presentation will include an overview of the Artemis 1 science payloads radiation data in comparison with the Orion EFT-1 and ISS measurements.