RHESSI Tohban report, 8-June-2004 to 15-June-2004 1. Venus transit. A transit of Venus across the solar disk occurred from about 0530-11:30 on 8-June. To exploit its passage, the SAS cadence was increased from 16 to 32 Hz and the number of pixels per 'image' was greatly expanded. Up to ~10^5 one-dimensional profiles of Venus were expected to be imaged by the SAS with the goal of better characterizing its scattered light response and with the possibility of confirming the roll aspect calibration. For a typical profile, see http://sprg.ssl.berkeley.edu/~mfivian/sas/venus.png 2. Crab offpointing The Crab's closest approach to the Sun was on 14-June at ~22:00 UT. Offpointing operations to observe the Crab began at 8-June 22:38 when the Crab-Sun offset was 6 degrees and contined during BGS passes until June 12 at which point the pointing mode was left in IDLE. By 11-June 05:12 the RHESSI-Crab offset was about 0.9 degrees; by June 12 03:33 the offset was 0.4 degrees; and by June 12 22:29 the offset was 0.1 degrees. The uncertainty in the offsets is estimated to be about +-0.2 degrees due to uncertainties in the FSS calibration. There is an indicated west to east drift of ~0.1 degrees/day, but this may be an artifact of the FSS response. Assuming solar activity remains low and the drift is determined to be small enough, the plan is to leave the pointing mode in IDLE until at least 21 June. 3. Solar Activity Solar activity was quite low during this period with 17 B-class, 5 C-class and one M1 event at 13-June 11:56. The rise of the M1 event was observed with RHESSI about 1.9 degrees from the Sun. 4. Memory Management There were no memory issues this week. 5. Data Gaps There were 3 data gaps totalling 8 hours on June 11 and 12. These data are believed to be on the ground but with their pipeline processing interrupted following computer moving activities on the 12th. 6. Next tohban = Hugh Hudson Respectfully submitted Gordon Hurford ghurford@ssl.berkeley.edu