SSOC Tohban Report for Week 51 (19 - 24 December 1994) KSC : M.Takahashi and S.Masuda SSOC: T.Sakurai and K.Shinoda 1. Solar Activity ------------------------------------------------------------ Activity in this week was very low, at GOES B2 level or lower. PFI target regions were NOAA#7815 till 21-Dec-94, and #7817-18 from 22-Dec-94. One C-class flare was observed by Yohkoh. 2. Standard Operation -------------------------------------------------------- 2.1 SXT Table Uploads DATE TABLE ID comment 19-Dec-94 Pass#2: 941219 P2 MONDAY flare mode terminator images 20-Dec-94 Pass#4: 941220 P4 DKCAL 21-Dec-94 Pass#2: 941221 P2 WEDNESDAY 22-Dec-94 Pass#2: 941222 P2 THURSDAY 23-Dec-94 Pass#2: 941223 P2 FRIDAY 2.2 STT Timer Set STT Timer was set on Pass#2, 19-Dec-94(Mon), and on Pass#2, 26-Dec-94(Mon). 2.3 OG write OG 20H (S/C NORMAL POINT) was modified and written on Pass#1, 21-Dec-94(Wed). 2.4 S/C off pointing None performed. 2.5 BCS CAL BCS SOURCE CAL (by OP) between Pass#3 and #5, 22-Dec-94. BCS STIM CAL on Pass#3, 22-Dec-94, with ROG 63H and 64H. 3. Special Operation ------------------------------------------------------- Flare mode terminator images were taken between Pass#1 and #3, 19-Dec-94, on NOAA region #7815 and #7817 by OP command. ROG 20H (S/C NORMAL POINT) was executed on Pass#2, 21-Dec-94, in order to change the normal pointing position of Yohkoh slightly toward north. 4. Errors & Problems -------------------------------------------------------- 4.1 Network Disconnecton at Sagamihara on 19-Dec-94(Mon) Because of the shutdown of NACSIS main network to which ISAS is connected, the network connection between Sagamihara and outside was lost on 19-Dec-94. The disconnection lasted longer than announced, from 9 am to late evening. GBO mails of Monday operation delayed because of this. 4.2 SXT Error Bitmap errors were found on Pass#1 and #2, 23-Dec-94, and were recovered by Yobi-C command. 4.3 BCS Error An error occurred on Pass#2, 20-Dec-94, and was recovered on the same pass. 4.4 CRT Display at KSC The CRT display of flare5 workstation at KSC was broken on 25-Dec-94. Sakao san will take care of repair. 5. DSN Communications ------------------------------------------------------ 5.1 DSN Strawman Schedule for W02(1995) Strawman schedule of W02 is not available even in this morning. A fax requesting the current status of DSN scheduling was sent to JPL on Saturday. 5.2 DSN Preliminary Schedule for W01(1995) We obtained the schedule on 22-Dec-94, and cancelled 13 passes. 5.3 DSN Final Schedule for W52(1994) We obtained the schedule on 22-Dec-94, and cancelled 12 passes. 5.4 Data Transmission Missing data since 13-Dec-94 were due to a trouble with the data transfer from DSN to ISAS SSOC#1. This is now fixed and presently no delays exist. 6. Yohkoh/ASCA Pass Conflicts -------------------------------------------- In week 51, Pass#4, 21-Dec-94(Wed) Pass#4, 22-Dec-94(Thu) were given to ASCA. The operation of Yohkoh was finished before actual LOS times on Pass#3-#5, 20-Dec-94(Tue), for the subsequent operation of ASCA. In week 52, the following passes will be given to ASCA. Pass#4, 26-Dec-94(Mon) Pass#4, 27-Dec-94(Tue) 7. Holiday Schedule ------------------------------------------------------- The last operation of this year is on Pass#5, 28-Dec-94(Wed), from 5:54 to 6:07 UT. The new year holidays are from 29-Dec-94 to 03-Jan-95. The first operation in 1995 will start at about 5 am (JST) of 04-Jan-95. The SSOC#1 computer will become available from 13:00 pm (JST), 04-Jan-95. 8. Hikitsugi -------------------------------------------------------------- 8.1 Tohbans Week 52 SSOC : T.Kosugi, T.Watanabe(26-Dec-94) KSC : S.Masuda Week 01 SSOC : H.Hara, L.Harra KSC : K.Yaji The next WOM is on 09-Jan-95. 8.2 STT Timer Setting The next STT timer set should be done on 28-Dec-94. 8.3 Change of Guards On 20-Dec-94, the role of SXT chief observer was transferred from L.W.Acton to N.Nitta.