Miniaturized MiniPix-Timepix3 radiation monitor in LEO orbit onboard One Web JoeySat satellite: high-resolution radiation data

Abstract The Timepix3 detector has been implemented as a miniaturized, low-power payload for spacecraft operation and deployment onboard satellites. This work reports on the development for the JoeySat telecommunication micro-satellite of the One Web EUTELSAT constellation, representing the first-ever spacecraft deployment of the Timepix3 detector. The architecture, customization, and configuration of the device at the HW, SW, and in-orbit operation levels are described. Following launch into LEO orbit at 600 km altitude in May 2023, the detector payload underwent successful in-orbit commissioning. High-resolution radiation data are collected regularly and continuously along the satellite orbit in LEO. We present first results of detailed radiation data acquired by Timepix3 with a silicon sensor, including a preliminary physics-level evaluation in terms of time distributions and Earth orbit maps of total and partial particle fluxes.