Tohban report, 2005/09/06 to 2005/09/12 Iain Hannah (hannah@ssl.berkeley.edu) 1) Solar Activity: Solar activity has been very high this week since AR10808 made an appearance on Wednesday. Since then we have had 7 X-class flares of which one got excellent coverage (the X2.1 10-Sep-05 21:30UT+) and another with good coverage (X1.1 09-Sep-05 2:43UT), although the later is complicated with lots of M-class events. The rise phase of the rest of the events were generally missed due to SAA or nighttime: for the largest event (X17+ 7-Sep-05 17:17UT) we got a few minutes of the peak between SAA and night, plus two orbits observing the decay phase. This active region is likely to produce more large flares this week. We have not had an X-class one for 48 hrs but there is still a lot of M-class events occurring. How many GOES flares occurred? Flares above B, C, M, X class were 0 23 11 7 And how many of these are listed in the RHESSI flare list? Flares above B, C, M, X class were 0 16 11 6 And how many had EXCELLENT coverage? Flares above B, C, M, X class were 0 2 5 1 There were RHESSI flares/GOES flares 142 / 41 over the time range 04-Sep-05 11-Sep-05 2) Memory Management: The memory has been rather full this week due to the high levels of solar activity. We have had a fill rate of about 50% after the passes each night and are currently at 48.627%. Given the same levels of solar activity this memory fill rate should be able to continue and hopefully come down a bit. 3) Decimation/Fronts at night: We briefly changed to normal/vigorous and started to collect front events during eclipse on 9/7 but changed back to active/vigorous and not collecting front eclipse events once the solar activity picked up on wednesday. 4) Data Gaps: None on the 7,8,10 and a few 300 sec ones on 6 and 9. 5) Next week's tohban: Steven Christe