SXT REPORT FOR WEEK 31; 24 JULY 1993 TO 1 AUGUST 1993 GENERAL STATUS SXT continued to work well and operations were routine. Solar activity was low, with only a single C-class flare all week. Nevertheless, as we often note in this column, no uninteresting SXT image has yet appeared - this applies especially nowadays to long exposures represented in color table 15! The main organizational activity this week was preparation for forthcoming coordinated observations, as described below. PERSONNEL No changes in the SXT personnel happened this week, but Doschek and Kundu both visited. Doschek talked at the Yohkoh seminar on the relationship between blue shifts and hard X-rays. Hudson also made some comments about the SPD meeting, in particular the McTiernan et al paper on directivity in the 15-Nov-1991 event. CAMPAIGNS There are several joint observing campaigns scheduled over the next month, summarized here: Campaign Dates Proposer SXT/CO Coord Special Ops Norikura 27-Jul-93 K. Ichimoto (NAOJ) Hudson Hudson Tables 2-Aug-93 Tenerife 3-Aug-93 T. Sakurai (NAOJ) Acton Hudson Tables 13-Aug-93 SERTS rocket 17-Aug-93 J. Davila (GSFC) Acton TBD Tables OP We have now set up an "anonymous ftp" access to information related to these and future joint observing campaigns. To access this information from a computer with ftp software, do % ftp 133.74.8.100 Connected to 133.74.8.100. 220 isass0.solar.isas.ac.jp FTP server (Version 4.1 Sun Mar 25 22:59:11 EST 199. Name (133.74.8.100:TBD): anonymous 331 Guest login ok, send ident as password. Password: 230 Guest login ok, access restrictions apply. ftp> get README - and then follow the instructions. We hope that communication using this system will become a two-way street. At present we are not planning to make data available this way, because of the official CRL service for routine access to daily SXT images, but in special cases of course this would be a possibility. There has been no official notification yet about the beginning of the CRL service, but one or two practice sessions have shown that it works fine. SCIENCE PROGRESS Solar science heated up at ISAS this week, impeded only by the annual ISAS beer party on Friday. Kundu visited, asked intelligent questions at the seminar, and worked with Nitta. Doschek worked on the "question mark flare" and he, Khan, and I started a program of over-the-limb event studies. The poor observing conditions at Norikura during the coronal observation campaign were quite disappointing. This is the second consecutive attempt with nil results (but there is one more chance on Monday). In this case the Sun cooperated with a nice LDE event at the W limb that probably would have produced coronal emission-line structures at a detectable level. The main development of this event, which was not of flare mode brightness, took place during the "invisible orbits", which thanks to DSN we can cover very well. OPERATIONS The routine coronal offpoint took place on Friday, rather than Thursday, because of typhoon conditions at Uchinoura. There was some worry that wind loading of the telemetry antenna would make the return to normal pointing impossible due to lack of uplink. In the event things worked out OK, although the eye of the storm appeared to have gone directly across KSC. In spite of having the experienced Watanabe-san at KSC, we failed in several attempts to get terminator images by using real-time commands. We had been much more successful with stored commands in the OP, so we will return to that system next week. It requires more preparation but is necessary anyway since the KSC contact times have now precessed away from the D/N terminator. Hugh Hudson SXT Chief Observer