SXT Status Report from ISAS 29 July - 7 August 1994 Nariaki Nitta SUMMARY SXT operations continued to go well. Solar activity stayed low (GOES 1-8 A flux at A level with occasional B class flares). However, a second campaign to observe emerging flux was successfully conducted in coordination with Hida Observatory. Because of holiday season and meetings, and the comfortable weather (!!), scieintific activities were not very high at ISAS. We are planning an informal, all-day seminar to feature local graduate students and young scientists. PERSONNEL Jim McTiernan returned to Berkeley after a successful two-week visit, in which he worked with various HXT and SXT issues. Jim Lemen finished a heavily-loaded two-month stay. Sam Freeland also returned to Palo Alto after completing another software upgrade. Hugh Hudson returned from Jupiter observations, Nariaki Nitta from COSPAR through Palo Alto, and Gary Linford from Palo Alto. CAMPAIGN A second campaign aimed at characterizing emerging flux was organized by Kurokawa-san of Hida Observatory. He wanted to clarify the relationship between the H-alpha arch filament system (AFS) and X-ray coronal loops. The data we have taken certainly can cover wider topics than that. The campaign was highly successful, chiefly because of the interesting emerging flux regions on the sun (AR 7760, 7761 and 7762, the last one showing substantial growth). Second, observatories that participated the campaign from east, such as Mees and Big Bear, greatly helped the sleepy SXT Chief Observer and Kurokawa-san be aware of the locations of emerging flux, prior to the KSC contact passes early in the morning, at which time SXT was to focus on the right target and operate in high time resolution. Such observations normally took place for one or two orbits per day, and the campaign essentially ran for one week. Weather at Hida Observatory was in general cooperative. During the next few months, lots of efforts will be devoted to analyzing these joint datasets. SEMINAR People had long forgotten about the ISAS seminar due to holiday season, excessive meetings and travel. Also, one of the roganizers Shibata san was and is still away (in Texas, to avoid the Tokyo heat wave presumably). However, another organizer Hudson resumed it by giving an informal talk on the "solar flare myth" controversy - the question is, are there really two paths tha lead to flaring (Gosling's point of view) or is there only one (the "grand unified theory" point of view)? It is really not clear yet, neither observationally nor theoretically. Hudson and Nitta will try something new this month: a "solar neighborhood" meeting, modeled on the California idea: no theme, no organization, youth encouraged. SCIENCE Except on Monday and Thursday, we hardly saw people at the ISAS Yohkoh analysis center, except for the locals (Sterling, Harra, Hudson, Linford and Nitta). The ISAS-purchased flareN workstations were essentially deserted. The newer, more powerful SUN workstations are still IDL-free, and old ones still IDL-upgrade-free, because of the outrageous pricing of IDL in Japan. We strongly hope that someone will sort out this problem soon. The Masuda "home run" paper trumpeting a major Yohkoh discovery (of impulsive coronal hard X-ray emission) was accepted by Nature, the first Yohkoh paper in this category, with revisions completed this week. This paper, incidentally, supports the "grand unified theory" concept of macroscopic coronal reconnection as a mechanism for all categories of solar flares. OPERATIONS Things continued fairly normally. The ASCA conflict situation is very gradually getting worse, almost imperceptibly - Yohkoh lost only two KSC passes to conflicts this week. Because of the AFS campaign, we did not carry out the weekly S offpoint with long exposures for Ulysses support. We will do that this week, along with the routine bakeout of the CCD.