SXT REPORT FROM ISAS 12 July 94 to 28 July 94 B. N. Handy SOLAR ACTIVITY Solar activity has continued in a low level, starting out at a high GOES B level, jumping to about C5 for a day, then declining to low A where it not stands. There have been numerous small active regions on the disk at one time, but even this is in steady decline. Activity is now sufficiently low we call GOES C-class events "Flares", and there have been four of those. PEOPLE Things have calmed down significantly at ISAS since the Solar-B meeting. The only arrival since that time would be J. McTiernan (UC Berkeley), who is here for a two week stay. N. Nitta put in some time here in preparation for Cospar, and H. Hudson spent two weeks in the states looking at Jupiter. B. Labonte finished up an extremely productive six-month stint, returning to Hawaii with his family last week. Sam Freeland finished up a crisis- driven one month stay updating the Yohkoh Software tree, fixing the MO disk archive, and many other tasks too numerous to mention. G. Linford arrives on the 28th, and B. Handy returns to the states at the end of the month, passing the SXT Chief Observer torch to J. Lemen and N. Nitta. Lemen returns to the states 2-July, approximately five weeks after his scheduled departure. Regulars include J. Lemen, M. Kundu, L. Murnion, and A. Sterling. OPERATIONS SXT operations continue to go smoothly, with no campaigns carried out over the last few weeks. There have been several minor problems with the transmitter at KSC, but these are being ironed out slowly. Conflict resolution with ASCA is mounting in importance, as two KSC conflicts a week are now the norm. The season for DSN conflicts is also fast approaching, and Jim Lemen ahs been hard at work with the ASCA folks and IDL to automate the conflict resolution process. Lemen and Sterling are spending a week as SSOC Toban, doing double duty not only as toban but also spending a great deal of time performing much-needed updates on the Tohban Manual. Over the last month, there have been problems with the GOES 6-second data. Apparently the files arriving here at ISAS have been corrupted and unusable. We also recently learned the GOES 6-second data will soon no longer be available, as those satellites are to be taken off-line. SXT operations at ISAS were thrown into disarray by a catastrophic disk crash on one of the FLARE workstations, which effectively stopped any US-side people from using these machines. Several important cron jobs were also stopped, and efforts by M. Morrison, S. Freeland and J. Lemen moved these jobs to the ISASS machines until the FLARE situation can be fixed. RESEARCH ITEMS LaBonte finished up his report on the SXT dark signal images, much of which was covered in the previous Chief Observer's Report. Handy also finished up a preliminary report on the orbital variation of dark signal. It seems that there are several trends at work in the dark images, as the short exposure darks increase slowly in intensity over the course of an orbit, while the long exposure darks (30 sec) decrease, then "bounce back" about 55 minutes into the orbit. This phenomena has not yet been even unsatisfactorily explained. McTiernan continues Metcalf's work with Pixon reconstruction of HXT images. The Maximum Entropy Method (MEM) tends to give structure to noise, and footpoints tend to be equal in intensity. The pixon method tends to put more intensity in the footpoints, but the intensities are no longer equal and the footpoints are much smaller now. Power spectra of the resulting images are just sufficiently different to keep people wondering: "Is it real?"