SXT Status Report January 4, through January 28, 2001 (Weeks 1-4) H. Hudson, A. Takeda This report covers the first four weeks of 2001. We goofed and did not send the regular biweekly report two weeks ago, sorry. We are happy to report that Yohkoh and SXT emerged from the long New Year's holiday and are performing well. SOLAR ACTIVITY Activity has been not so high yet this year, but some flare-productive regions have come and gone. NOAA9313 marked four M-class flares, and 9311 and 9325 produced one M-class each; there have been ten M-class flares in all in January. During the 25-27th, some gorgeous mass ejections were seen in the SoHO/LASCO coronagraph data, and one can find some corresponding phenomena in our full-frame X-ray images. OBSERVING CAMPAIGNS We carried out no cooperative observing programs during this interval, but have a target-of-opportunity (TOO) search for sigmoid structures under way since Dec. 9. Please see our webpages for more 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 Instrument status is good, with no new problems to report. We updated the normal pointing on Jan. 17 and 26. A small CDAW took place Jan. 18-19 on the general subject of SXT image deconvolution, with emphasis on understanding the point response function and the possible systematic errors involved in correcting for it. Please see http://solar.physics.montana.edu/SXT/Decon2001/ for details. TELEMETRY DOWNLINKS Week Wallops Santiago Goldstone Canberra Madrid NASA Japan 01 18 1 1 2 3 25 27 02 32 0 3 6 0 41 28 03 33 0 0 1 0 34 28 04 25 6 0 3 3 37 25 05 25 7 7 0 12 51 27 Kagoshima should average 6*5+2 = 32 and the NASA target is 7*6 = 42. We have started again to get Santiago passes, which restores some of the flexibility in telemetry scheduling. SXT OBSERVING SEQUENCE TABLES ============================================================== JST Day UT Date & Time Pass Table ID -------------------------------------------------------------- Thursday PM 04-JAN-01 10:39 4 010104 P3 ARS1 STD Friday PM 05-JAN-01 10:43 4 010105 P4 ARS1 DARK Saturday PM 06-JAN-01 05:40 1 010106 P1 ARS1 DIFF Saturday PM 06-JAN-01 10:46 4 010106 P4 ARS1 STD Monday PM 8-JAN-01 05:46 2 010108 P2 ARS1 STD Tuesday PM 9-JAN-01 07:32 3 010109 P3 ARS1 STD Wednesday AM 10-JAN-01 02:31 1 010110 P1 ARS1 DIFF Wednesday PM 10-JAN-01 07:36 4 010110 P4 ARS1 STD Thursday AM 11-JAN-01 02:34 1 010111 P1 ARS1 DARK Thursday PM 11-JAN-01 07:39 4 010111 P4 ARS1 STD Friday PM 12-JAN-01 04:18 2 010112 P2 ARS1 STD Saturday PM 13-JAN-01 04:22 3 010113 P3 ARS1 STD Monday PM 15-JAN-01 04:29 3 010115 P3 ARS1 STD Tuesday AM 16-JAN-01 01:09 1 010116 P1 ARS1 DARK Tuesday PM 16-JAN-01 06:14 4 010116 P4 ARS1 STD Wednesday AM 16-JAN-01 23:32 1 010117 P1 ARS1 DIFF* Wednesday PM 17-JAN-01 04:36 4 010117 P4 ARS1 STD Thursday AM 18-JAN-01 01:15 2 010118 P2 ARS1 STD Friday AM 18-JAN-01 23:37 2 010119 P2 ARS1 STD* Saturday AM 20-JAN-01 01:22 3 010120 P3 ARS1 STD Monday PM 22-JAN-01 03:11 4 010121 P4 ARS1 STD* Tuesday AM 22-JAN-01 22:09 1 010122 P1 ARS1 DARK* Tuesday AM 23-JAN-01 01:33 3 010122 P3 ARS1 STD* Wednesday AM 23-JAN-01 23:54 3 010123 P3 ARS1 STD* Thursday AM 24-JAN-01 20:35 1 010124 P1 ARS1 DIFF* Thursday AM 25-JAN-01 01:40 4 010124 P4 ARS1 STD* Friday AM 26-JAN-01 01:43 4 010125 P4 ARS1 STD* Saturday AM 26-JAN-01 19:00 1 010126 P1 ARS1 STD* -------------------------------------------------------------- Data reformatting is complete through 16-dec-00 (week 00_51). OBSERVING SEQUENCES: The flare sequence tables have been simplified so as to get higher cadence: full-resolution images with three filters plus single quarter- and half-resolution. This replaces the non-standard tables with special overexposed images to study mirror scattering. Most of the FFI observations during this interval were done with the modified "rapid" scheme, which produces sets of four long-exposure AlMg movies. We hope that these eight-minute glimpses will give us good views of global waves. SEMINARS: H. Hudson gave an informal seminar on Jan. 13, "Searching for Solar Shocks" SCIENCE NUGGETS: 5-jan-01: "Motions of coronal-hole boundaries", the second nugget in a sequence discussing various aspects of SXT observations of coronal holes. In this case - a look for network effects. 12-jan-01: "A 'starburst' flare and scattering research", introducing the subject of the CDAW later that week. A "starburst" image is one of our accidental overexposures on a flare. 19-jan-01: "A Flare in an almost-anemone", describes a compact flare observed on 16-Nov-00 in an "anemone" or rosette active region. 26-jan-01: "A coronal conveyor belt?", discusses coronal loops linking two regions and conveying some hot plasma from one to another. The full list of 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 PERSONNEL: H. Hudson departed on 18th, G. Slater arrived on 25th. TOHBANS (spacecraft operators) Tohbans for week 1 SSOC: T. Shimizu KSC: K. Ichimoto SXT_CO: H. Hudson SXT_SW: J. Bartus Tohbans for week 2 SSOC: K. Nakakubo, H. Ito KSC: K. Ichimoto(-12)/K. Matsuzaki(11-) SXT_CO: H. Hudson SXT_SW: J. Bartus Tohbans for week 3 SSOC: Y. Kato, Tet. Watanabe KSC: K. Matsuzaki SXT_CO: H. Hudson/A. Takeda SXT_SW: J. Bartus Tohbans for week 4 SSOC: J. Khan, K. Yoshimura KSC: Y. Kato, H. Ito SXT_CO: A. Takeda SXT_SW: J. Bartus, G. Slater