Log for tohban anomalies
From RHESSI Wiki
From time to time, an anomaly comes up that the tohban (or someone else on the team) needs to deal with. This page is meant to serve as a record for spacecraft operations, parameters, etc that were out of the ordinary in case that same event happens again. Anomalies or issues with the detector health should be recorded on the dedicated Detector Updates page and not this one.
The list is not meant to be exhaustive, but may aid a tohban in determining if a problem has happened before and what to do about it. The list starts in February of 2013; earlier events are not included. (Unless some intrepid soul wants to go through and add some history...!)
- 2013 February 10. The ADP froze and required a reset, which was performed the next day. Symptoms of the problem were a red error on the ADP program checksum on the spacecraft page as well as zero triggered limbs despite the spacecraft's being in sunlight. Martin was contacted and the ADP was reset. An ADP freeze happens once every year or two and can manifest itself in many ways (not just this one).
- 2013 May 3-4: There was a spin rate snafu. Occasionally the magnetic field configuration is such that the ACS system does not sense any change in magnetic field as it spins, thinks something is wrong, and after a timeout period (5 min) goes into IDLE mode. This problem happens (usually a few occurrences close together) about once a year or so. The ACS system was commanded back to precession mode on the next available pass. No ill effects remained from this issue. Here is the sequence of events:
2013-123-16:11 - ACS system went into IDLE mode due to spin rate miscalculation. 2013-124-02:08 - Ground command to precession mode 2013-124-03:42 - Autonomously transitioned back to Normal mode.
