RHESSI Tohban report, 09-Aug-2004 to 16-Aug-2004 Martin Fivian, mfivian@ssl.berkeley.edu 1. Solar Activity The active region 656 produced quite a bit of activity including an X1.0 flare (with baselevel around C1) on Aug 13. There is a good coverage for this mini X-flare. AR0656 is still on the disk for 2 or 3 days and NOAA assigns a relatively high probability for big flares (M: 75%, X: 20%). The GOES base level rose from about B5 up to C3 on Aug 14. How many GOES flares occurred? Flares above B, C, M, X class were 14 65 17 1 And how many of these are listed in the RHESSI flare list? Flares above B, C, M, X class were 4 30 12 1 And how many had EXCELLENT coverage? Flares above B, C, M, X class were 4 17 3 1 There were RHESSI flares/GOES flares 214 / 97 over the time range 09-Aug-04 16-Aug-04 2. Decimation NORMAL/ACTIVE at beginning of week change to ACTIVE/VIGOROUS at 2004-08-09 22:53:22 UT change to NORMAL/ACTIVE at 2004-08-13 22:57:16 UT change to ACTIVE/VIGOROUS at 2004-08-14 17:54:49 UT 3. Memory Management In order to be prepared for the increasing probability of big flares, 16 hours of data has been deleted to bring the SSR fill level down (see below). Lowering the decimation on Aug 13 together with the increased GOES base level and the very high rate of particle events the SSR filled again to be at 75 % at the first pass on Aug 14. Therefore, the decimation has been increased again and the thin shutter has been locked in. Attenuator change to 1-3 at 2004-08-14 17:47:07 UT. The SSR fill level is currently at 43 % after the last Berkeley pass. 4. Data Gaps The data of the following time range has been deleted by forwarding the read pointing. Aug 11 11:00 to Aug 12 03:00 Two smaller gaps will be filled by replaying the data. 5. Detector 2 At 2004-08-09 21:11:27 UT: Lowered high voltage on detector 2 by two counts to 1029.4 V (or "54").