Final version April 2, 2002 H. S. Hudson RHESSI tohban report for week starting Tuesday, March 26, 2002 (DOY 086-092 2002) 1. Memory management Memory levels this week @ first Berkeley contact 086 3/26 01:44 13.7% 087 3/27 00:12 22.0% Shutter comes out (autonomous 013 mode) 088 3/28 00:17 24.0% 089 3/29 00:27 34.7% 089 3/29 22:51 54.9% 090 3/30 22:57 74.1% Shutter back in 091 3/31 23:03 64.3% Comment - Estimates by Bob and David suggest that this week's memory increase probably resulted partially from electron storm counts as well as shutter-out solar counts. It should be a high priority to establish a rear-segment decimation pattern for high geomagnetic latitudes. I have not mastered the tools well enough to know quantitatively what is going on, unfortunately. 2. Coordinated observations I belatedly contacted TRACE by simply calling Karel Schrijver up. His phone number is 650 424-2907. The word is good: as long as there is some activity, such as now, they are eager to do related observations except for limited campaign intervals. Right now this means rapid-cadence 195 images, perhaps at an 8-sec rate, which I think is pretty ideal. 3. Other suggestions * Tohbans need access to NASA contact schedules ahead of time * The SAS sampling rate ought to be on the "HESSI spacecraft status" page * Can we have whole-Sun HESSI image (low resolution!) somewhere? * A longer time integration for PD counts on "HESSI spacecraft status" page * Need graphic showing GOES, memory level, and dump times for past 3 days * Would love external access to beautiful SatTrack world map graphic * Some way the tohbans can get better insight into the decimation program. 4. Summary comment For the near term RHESSI needs a diligent tohban, who should probably spend most of his time working on useful tools (as well as attending the first pass and generally acting as an additional pair of eyes). It is not a situation that is very parallel with Yohkoh, and I don't recommend a formal checklist although we may want one some time in the future as we gain experience. I still need to be tohban for several more weeks before I'll feel comfortable that I understand enough of the key stuff! 5. Correction of error During the discussion at the Tuesday meeting, Mark and I claimed we'd seen an almost-M flare with no shutter motion. That was because the shutter was already closed, I now think. The event was April 2 00:30 or so. However I still believe that the C, M, X calibration of the thin-shutter motion will not be so stable as, say, the Yohkoh flare trigger was. No problem with this, of course. ++++++++++++++++++++++++++++++++++++++++++++ Appendix A: useful information UT = PST+8:00 Key Web pages http://hessi.ssl.berkeley.edu/ground_systems/bgs_tracking_schedule.html http://hessi.ssl.berkeley.edu/ground_systems/hessi_spacecraft_status.html http://sprg.ssl.berkeley.edu/~dsmith/hessi/HME.html http://sprg.ssl.berkeley.edu/~hhudson/goes_hessi_plots/ http://www.lmsal.com/solarsoft/last_events/ http://www.sel.noaa.gov/today.html Appendix B: operating the ITOS pages Get them by entering PAGE in the command window With good stuff: PLOT makes a plot Some plots are accessible with a click Pages monitor_rates igseattn ssrcontrol igsespc buspower igsact acsmain