SXT Status Report 15 June, 1998 - 29 June, 1998 (Weeks 25-26) D. McKenzie, H. Hudson SUMMARY Activity was moderate, and SXT has operated well. We've been busy with joint observations scheduled for TRACE, SOHO, and ground-based observatories. We hope that SOHO will come back! SOLAR ACTIVITY and SCIENCE The GOES level (see the plots, for example, on our weekly SXT Web pages) remained between B and C, with many C flares and two M flares. The current hot active region, 8253, had a relatively small sunspot area of about 200 millionths at the end of the reporting period. We are watching AR 8253 as a part of JOP 83 and TRACE coordination. SXT INSTRUMENT STATUS AND CALIBRATION ACTIVITIES Data archiving is complete through Week 23 (June 6). Terminator acquisition continues. No new spacecraft re-pointings were necessary during the reporting interval. SCIENCE The two current "science nuggets" are (19-Jun) an extension of the sigmoid => halo CME report of 12-Jun, and (26-Jun) a retrospective look at the Mercury transit of 1993. We have another one coming up in 1999. 19-Jun-98 Followup: The Sigmoid That Wouldn't Quit 26-Jun-98 An X-ray Transit of Mercury To access these, go to http://www.solar.isas.ac.jp/sxt_co/index.html As usual, the current week is also on http://www.solar.isas.ac.jp/sxt_co/SXTweekly.html. This shows the weekly SXT operations report as well as a GOES plot indicating the Yohkoh data currently available on line. The Mercury picture (pulled from a Sam Freeland SXT Web page) has been offered to "APOD" (the Astronomy Picture of the Day); they just printed "solar magnetic bananas" for those interested. OPERATIONS ISSUES Week 25: 10 KSC passes lost due conflicts with Planet-B. Week 26: 14 KSC passes lost. VISITORS AND PERSONNEL Visitor George Simnett arrived, with lot of fascinating movies. SEMINARS None in this period. TOHBANS Tohbans for Week 25 SSOC : Y. Kato, S. Akiyama, H. Hudson KSC : J. Sato, M. Torii SXT_CO: D. McKenzie SXT_SW: - Tohbans for Week 26 SSOC : M. Akioka, T. Yamaguchi KSC : M. Torii, T. Magara SXT_CO: D. McKenzie SXT_SW: -