This Auroral Oval Monitoring (AOM) Phase A study was a reorientation after the previous Phase AB1, with a simplified payload prioritizing auroral observation and a complete redesign of the mission. The first part of the study was to update the mission architecture with an affordable, sustainable, and scalable solution resulting in a Mission Definition Review (MDR). For evaluation of the payload, the payload module prime from the previous Phase AB1, Thales Alenia Space UK (TAS-UK) was strengthened with a group of end-user advisors from UK Met Office and FMI to advise the consortium directly on the choice of orbit, instruments and help with the commercialization analysis.