SSOC Tohban Report for Week 07 (15 FEB - 21 FEB, 1994) Sawa, Hudson (SSOC) Yuda, Takahashi (KSC) 1. Solar Activity Solar activity was medium low - some flux but few flares. A huge coronal hole in the S was very clearly visible, possibly the one related to the Anik satellite charging damage suffered last month. At the very end of the week, the fairly bright region near disk center produced a large M flare with type II event, which unfortunately was missed by Yohkoh because of orbit night. o Date Time (UT) X-Ray Opt Loca- NOAA Peak Radio Reports Begin Max End Class Imp tion Region % Compiled module: CHECK_TIME. 15-FEB-94 00:49 01:41 01:57 B9.0 15-FEB-94 03:45 03:51 04:02 C1.0 SF N12E49 7670 15-FEB-94 05:51 05:56 06:00 C1.1 SF N10E47 7670 15-FEB-94 07:47 07:57 08:11 C1.8 SF N09E63 7671 15 16 24 16-FEB-94 00:54 00:59 01:04 B3.6 16-FEB-94 11:06 11:12 11:25 B6.2 16-FEB-94 15:02 15:09 15:14 B5.6 SF N07E25 7670 16-FEB-94 19:11 19:12 19:15 SF N10W51 7668 17-FEB-94 03:00 03:00 03:03 SF N11E23 7670 17-FEB-94 10:16 10:23 10:29 B8.1 17-FEB-94 11:00 11:11 11:26 C1.7 III 18-FEB-94 05:38 05:42 05:46 C1.1 SF N07E24 7671 18-FEB-94 09:12 09:56 10:17 C1.1 18-FEB-94 13:14 13:19 13:22 B5.6 SF N08E21 7671 18-FEB-94 20:35 20:39 20:44 B4.3 18-FEB-94 21:48 21:52 21:54 B4.2 19-FEB-94 02:54 03:02 03:12 B7.3 19-FEB-94 10:50 10:55 10:59 B4.0 19-FEB-94 16:36 17:03 17:14 B5.1 19-FEB-94 19:13 19:33 19:49 B6.6 (note: summary listing not complete through the M flare - data base for event listing was not properly up to date) 2. Standard Operations 2.1 SXT Table Uploads Pass ID 14 Feb 0644 UT 940214 T1 P2 ARS1 ND CAL 15 Feb 0704 UT 940215 T1 P2 ARS1 + DEEP 15 Feb 1931 UT 940215 T2 P4 ARS1 DKCAL 16 Feb 0542 UT 940216 T1 P2 SOUTH COR HOL 16 Feb 0908 UT 940216 T2 P4 ARS1 STD LONG 17 Feb 0708 UT 940217 T1 P3 ARS1 STD LONG 18 Feb 0451 UT 940218 T1 P2 SOUTH CH-FR 18 Feb 0818 UT 940218 T2 P4 ARS1 STD+LONG 19 Feb 0501 UT 940219 T1 P2 SOUTH CH-FR 19 Feb 0827 UT 940219 T2 P4 ARS1 STD+LONG 2.2 STT Timer Set 15 Feb 0515 UT (next setting needed Tuesday, week 08) 2.3 Offset pointing 2.3.1 Real-Time Pointing Commands Pass OG Name 16 FEB 0551 85 S/C SOUTH (16') 16 FEB 0908 32 S/C NORMAL POINT 18 FEB 0451 85 S/C SOUTH (16') 18 FEB 0818 32 S/C NORMAL POINT 19 FEB 0501 85 S/C SOUTH (16') 19 FEB 0827 32 S/C NORMAL POINT 2.3.2 ATTLOG ATTLOG was run on 17-Feb. ATTLOG was run on 22-Feb. 2.3.3 OP-generated Pointing Commands Date/Time OG Name 16 FEB 1235 36 S/C WEST (8') 16 FEB 1240 32 S/C NORMAL POINT 16 FEB 1413 35 S/C EAST (8') 16 FEB 1417 32 S/C NORMAL POINT 16 FEB 2042 36 S/C WEST (8') 16 FEB 2046 32 S/C NORMAL POINT 17 FEB 0449 35 S/C EAST (8') 17 FEB 0453 32 S/C NORMAL POINT 17 FEB 0626 36 S/C WEST (8') 17 FEB 0630 32 S/C NORMAL POINT 17 FEB 0803 35 S/C EAST (8') 17 FEB 0807 32 S/C NORMAL POINT 17 FEB 1255 36 S/C WEST (8') 17 FEB 1259 32 S/C NORMAL POINT 17 FEB 1431 35 S/C EAST (8') 17 FEB 1436 32 S/C NORMAL POINT 17 FEB 2239 36 S/C WEST (8') 17 FEB 2243 32 S/C NORMAL POINT 18 FEB 0154 35 S/C EAST (8') 18 FEB 0158 32 S/C NORMAL POINT 18 FEB 0330 85 S/C SOUTH (16') 18 FEB 0351 32 S/C NORMAL POINT 18 FEB 0508 85 S/C SOUTH (16') 18 FEB 0512 32 S/C NORMAL POINT 18 FEB 0645 35 S/C EAST (8') 18 FEB 0649 32 S/C NORMAL POINT 18 FEB 0823 36 S/C WEST (8') 18 FEB 0828 32 S/C NORMAL POINT 3. Special Operations Two passes on 16 Feb. were devoted to S offpoint (16') to give SXT a chance to get long exposures on the deep coronal hole at the SW limb. An additional S offpoint was attempted on 18 Feb., but the OP terminator offpoint commands had been forgotten by the SSOC tohbans, and this resulted in a premature end for the offpoint (the first D/N terminator) because of the NORMAL POINT command given in the OP at that time. The S offpoint experiment was repeated on 19 Feb. 3.1 BCS calibration 14 Feb 1010 UT ROG 63 H (BCS STIM CAL ver 2) ROG 64 H 3.2 HXT fine gain adjustment 18 Feb pass #2 4. Errors and Problems 3. Special Operations Two passes on 16 Feb. were devoted to S offpoint (16') to give SXT a chance to get long exposures on the deep coronal hole at the SW limb. This was re-done on 18 Feb and 19 Feb. 3.1 BCS calibration 14 Feb 1010 UT ROG 63 H (BCS STIM CAL ver 2) ROG 64 H 4. Errors and Problems 4.1 BCS error BCS suffered a data stoppage without error flags being set. The data stopped 15-Feb 09:41 + alpha, and a successful recovery was carried out 17-Feb 06:03. L. Harra comments that this was similar to a previous BCS error, i.e. that no error flag was set. To mimimize data loss we recommend that the KSC tohbans help out by checking for data with IDL>pr_evn or IDL>last_lc,/bcs in the workstation before operations each day. Everything is "hunky dory" now. 4.2 CANCEL_DSN We had a problem with the strawman cancellations for week 10. This may have been related to the DSN changeover from its analog recording system. The problem was reported to Lemen_san and solved interactively for this particular case. 4.3 False flares 15 Feb 2325 UT. This was not near the SAA, nor apogee, nor Hawaii. As a conjecture maybe it's aurora, since Yohkoh was near the N extreme of its orbit over N. America as close as ut can come to the auroral zone. 4.4 Mainframe #2 MF#2 was off on Saturday. 4.5 SXT Table Printouts The usefulness of the SXT table dumps appears to have diminished to the point where we should stop producing them routinely. The data are of course always available in the computers, and the Chief Observers routinely print the key parts of the tables for their fax messages. These are retained in D-toh files for reference. Accordingly, I propose that we stop generating SXT table dumps routinely. This will save the tohbans and chief observers some work. Comment: Hudson will check this point with Tsuneta and report back. Acton commented that the "difference" listing might be worth preserving if it is a unique record of the actual situation. 5. DSN communication 5.1 Cancellations We only cancelled 7 passes from the strawman of week 10, deliberately leaving some of the Madrid sequence in parallel. This week we had to cancel one of the Madrid passes because its maximum elevation slipped below the acceptable level, presumably because of orbit variations between strawman and final time. 5.2 DSN Data Delay All the data until DOY 48 (17 Feb.) has arrived at ISAS and is in Sirius. 5.3 New System at DSN Messages were received from DSN about the changeover, and recorded in the mail directory on flare1. There was outgoing mail from Itoh_san (ASCA) asking about the bit swap problem. There was no further information regarding the timing. The tohbans request that the responsible person at ISAS deal with this matter and inform the projects involved about the situation, so that we can stop wasting time worrying about it and communicating in the dark. Comment: Ogawara-san is working this problem. There may be a different situation for ASCA. 5.4 Two passes added (fax communication from Waldherr and Keller) did not appear in RASM. A second fax was sent 21 Feb. asking for clarification. 6. Hikitsugi 6.1 DSN alertness The new week's tohbans should remember to check for faxes and e-mail to see if there are real-time cancellations by DSN, as well of course as checking RASM daily. 6.2 Handling email The e-mail to and from yohkoh@flare1 should be filed in mail/mail_94_w08, and then correspondingly in the succeeding weeks. 6.3 New tohbans The next tohbans (week 08) are * SSOC Noguchi, Watanabe_Te * KSC Takahashi, Kubo, Yaji