Modeling a Three-Stage SQUID System in Space with the First Micro-X Sounding Rocket Flight

The Micro-X sounding rocket is a NASA funded X-ray telescope payload that completed its first flight on July 22, 2018. This event marked the operation of Transition Edge Sensors (TESs) and their SQUID-based multiplexing readout system in space. Unfortunately, due to an ACS pointing failure, was spinning during five minute observation period no scientific data collected. However, collected from internal calibration source partial success for offers unique opportunity study response TESs SQUIDs Of particular interest magnetic field NIST MUX06a SQUID tumbling through Earth's field. We present model explain baseline SQUIDs, which lead subset pixels failing "lock" full observational period. Future flights will include MUX18b with dramatically reduced susceptibility.