Tohban report, 16-Mar-2006 to 22-Mar-2006 Albert Y. Shih, ayshih@ssl.berkeley.edu 1. Solar Activity Active region 10862 produced a number of flares, including 6 C-class flares on March 21. 2. Memory Managment Over the course of the ADP anomaly on March 20 (see the operations secton), the SSR fill level climbed quickly, eventually reaching ~80% on the following day before passes could start emptying the SSR. Overall, the SSR fill level is still staying rather high as a result of low-energy noise events in the front segments as confirmed by David Smith. The current plan is to change the decimation table to always decimate 5/6 of the events that are below the channel that roughly corresponds to zero energy photons. 3. Data Gaps GAP START TIME GAP END TIME GAP (SEC) 2006-03-16T14:45:00.000 -- 2006-03-16T15:45:00.000 3600.0000 2006-03-16T21:10:00.000 -- 2006-03-16T21:15:00.000 300.00000 2006-03-17T20:20:00.000 -- 2006-03-17T20:25:00.000 300.00000 2006-03-19T22:40:00.000 -- 2006-03-19T23:00:00.000 1200.0000 4. Spacecraft Operations From Martin Fivian: "[On] 2006-03-20 at approx. 06:50, the ADP showed FIFO full, wrong checksum, and no realtime ACS information has been provided since. The ADP has been reset by issueing the following sequence of commands (stop/reset/reload parameter table from EEPROM/run ADP): 21:52:11 /iadpstop 21:52:30 /iadpreset 21:52:50 /iadpreset 21:53:10 /iadppter value=28 21:53:24 /iadprun After this reset, all ADP telemetry points are NOMINAL. Interpretation: The anomaly occured during a SAA transition where, most likely, the ADP program got corrupted. The ADP-reset command read the program from the EEPROM into memory and produced the correct checksum. To make sure the correct parameter table is used, it has been reloaded from EEPROM prior to re-run the ADP. Since 2006-03-20 21:53:24, the ADP performs nominally." 5. Web Products The RHESSI state-of-health pages are now password-protected. 6. Next Week's Tohban: Ya-Hui Yang (yhyang@ssl.berkeley.edu)