SXT Status Report October 29, 2001 - November 11, 2001 (Weeks 44-45) H. Hudson, A. Takeda SOLAR ACTIVITY Quite high activity levels, but only one X-class flare. It however was a princely one and produced a remarkable particle event. Its best property, though, was that it occurred in an otherwise undistinguished (but of course betagamma-delta) region with a clear coronal sigmoid. An alert was declared, and within 48 hours the flare took place. There were almost 40 M-class events. OBSERVING CAMPAIGNS Yohkoh participated in no coordinated observations during these two weeks, except for the sigmoid alert declared Nov. 3 and terminated Nov. 9. Please see our webpages for details about campaigns past and future: http://isass1.solar.isas.ac.jp/sxt_co/sxt_catalog.html http://isass1.solar.isas.ac.jp/sxt_co/sxt_future.html SXT INSTRUMENT STATUS AND CALIBRATION ACTIVITIES There was no problem to report. Yohkoh normal pointing was adjusted on 31 October. The flare trigger level was increased 7-Nov because of excessive time spent in flare mode. In week 45 we began again to experiment with 2x2 flare mode, given a window of opportunity before the HESSI launch. We are doing this primarily as a means of catching waves, but other large-scale faint phenomena (SADs, loop oscillations, dimmings) are interesting too. TELEMETRY DOWNLINKS Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 44 33 1 4 0 8 46 34 45 30 0 4 3 0 37 34 Kagoshima should average 6*5+2 = 32 and the NASA target is 7*6 = 42. SXT OBSERVING SEQUENCE TABLES ====================================================================== JST Day UT Start Time Pass Table ID Monday PM 29-OCT-01 09:05 2 011029 P2 ARS1 STD Tuesday PM 30-OCT-O1 07:21 3 011030 P1 ARS1 DIFF Wednesday PM 31-OCT-01 10:40 1 011031 P1 ARS1 DARK Wednesday PM 31-OCT-01 12:21 4 011031 P4 ARS1 STD Thursday PM 1-NOV-01 07:13 2 011101 P2 ARS1 STD Friday PM 2-NOV-01 05:30 2 011102 P2 ARS2 STD Saturday PM 3-NOV-01 04:54 2 011103 P2 ARS1 STD Monday PM 5-NOV-01 03:04 2 011105 P2 ARS1 STD Tuesday AM 6-NOV-O1 01:19 1 011106 P1 ARS1 DIFF Tuesday PM 6-NOV-O1 06:21 4 011106 P4 ARS1 STD Wednesday AM 7 NOV-01 01:13 1 011107 P1 ARS1 DARK Wednesday PM 7-NOV-01 06:18 4 011107 P4 ARS1 STD Thursday AM 8-NOV-01 02:50 2 011108 P2 ARS1 STD Friday AM 9-NOV-01 02:46 3 011109 P3 ARS1 STD Saturday AM 10-NOV-01 02:41 3 011110 P3 ARS1 STD -------------------------------------------------------------- Data reformatting is complete through September 22, week 38 of 2001. OBSERVING SEQUENCES: See above for remarks on the 2x2 flare mode. SCIENCE NUGGETS: November 2: "A veteran complex of activity, still alive and kicking" A large complex of activity that we had nuggetized before revived, an active longitude revealing itself, to produce X-class flares. November 9: "Sigmoid success: a CME predicted" documents the November 4 event, listing 8 or 9 remarkable characteristics; the one that pleased us most, of course, was its obedience to the pattern of sigmoid region eruption. But the interplanetary particle event was a GLE and a "snowstorm" on SOHO of blinding intensity. The full list of recent nuggets is kept on http://isass1.solar.isas.ac.jp/sxt_co/index.html and the current week's nugget also normally resides on http://isass1.solar.isas.ac.jp/sxt_co/SXTweekly.html For the complete nugget archive, see one of the following sites. http://isass1.solar.isas.ac.jp/nuggets/ (Japan), http://solar.physics.montana.edu/nuggets/ (Montana), http://www.lmsal.com/YPOP/Nuggets/ (California) and http://ydac.mssl.ucl.ac.uk/nuggets/ (UK). SEMINARS: There was a seminar with two speakers. K. Yoshimura (ISAS) spoke on "A study of an emerging flux region", and H. Hudson (SPRC/ISAS) on "Flares in white light, UV, and hard X-rays". PERSONNEL: H. S. Hudson arrived. OTHER: As predicted, in our fine new office space, our scientific productivity will has significantly increased! TOHBANS (spacecraft operators) for week 44 SSOC Tohbans: K.Shibasaki,S.Uno KSC Tohbans: S.kawasoe, I.Suzuki SXT_CO: A. Takeda SXT_SW: J. Bartus TOHBANS (spacecraft operators) for week 45 SSOC Tohbans: M.Sawa, K.Kobayashi KSC Tohbans: T.Kawasoe, T.Yokoyama SXT_CO: H. Hudson SXT_SW: J. Bartus