SOT shift report 2005-08-25 L2226 File created at 2005:237:12:43 UTC = 08:43 AM Aug-25-2005 EDT End 11:00:00 AM EDT SOT Lead: Ed Kellogg PLAN ---- OBSID Load inactive: SCS 107 shutdown last night at 2005:237:04:05:36 UT during LETG deployment, leaving the grating at a ~45 degree angle. RADIATION SUMMARY ----------------- Solar soft proton flux is high but falling (http://www.srl.caltech.edu/ACE/ASC/) Significant solar activity: The solar flare activity level was low. A total of 3 C class events was recorded yesterday. Region S583 behind the southwest limb produced a C4.7 long duration event peaking at 07:06 UTC. (http://www.dxlc.com/solar/).There was a short duration M class event today at ~04:30 UTC. CMEs reported for past two days: August 23: At least a partial halo CME was observed after the M2 LDE in region S583 during the afternoon. August 24: No obvious partly or fully Earth directed CMEs were observed. (http://www.dxlc.com/solar/- Jan Alvestad) Radiation Measurement Observed Observed/Limit --------------------- -------- -------------- ACE 2 hr fluence 4.3E+07 1/8.3 (http://www.srl.caltech.edu/ACE/ASC/) GOES-10/P2 4-9 MeV protons `P4GM' 1.4E+00 1/69.3 (ftp://ftp2.sec.noaa.gov/pub/lists/pchan/G10pchan_5m.txt) GOES-10/P5 40-80 MeV protons `P41GM' 1.1E-02 1/71.6 (ftp://ftp2.sec.noaa.gov/pub/lists/pchan/G10pchan_5m.txt) *ACIS* Orbital fluence (since perigee) (in perigee) (http://asc.harvard.edu/mta/alerts/current.dat) EPHIN rates (cts/cm^2-s-sr) at last comm. OBSERVED ---------------------------------------- -------- E1300 (2.64-6.18 MeV electrons): 0.1; RADMON limit = 10 P4GM (5-8.3 MeV protons): 16.0; RADMON limit = 300 P41GM (41-53 MeV protons): 0.0; RADMON limit = 8.47 (http://cxc.harvard.edu/cgi-gen/mta/Snap/snap.cgi?action=Latest) ACIS focal plane temperature -119.9 C, at dddZhh:mm:ss 237Z12:24:15 (http://asc.harvard.edu/acis/RT/acisrt.html) REAL TIME OBSERVATIONS UTC OBSID ---------------------- --- ----- - Notes from 9 am meeting ------------------------ OPS: Passes 3 Supports Completed (1 34 Meter, 2 26 Meter) from 236/1300 - 237/1300 Dump status Current Data loss None Last load segment ends 2005:240:07:30 CAPs, last 24h: 2005:236:21:22, 675, Re-enable SCS 107 2005:237:05:21 943, Re-enable Sun Position Monitor and Spacecraft Momentum Monitor Next passes(yyyy:ddd:BOT-EOT)2005:237:2050-2250 2005:238:0350-0450 MP: We are at a good attitude with low momentum. The EPHIN temperature will not be good for the long term in this state. We plan a maneuver load at 2130 UTC with a predicted EPHIN temperature of 97 F. S/C: Sequence of events that led up to our current state: Day 234 Radmon trip Day 235(yesterday) at the 5 pm radiation tagup the levels looked OK. 5:15 pm we ran CAP 674, reenable SCS 107. 5:30-45 Uplinked loads. 6:32 first command followed by a maneuver to 60 deg. pitch. LETG inserted Reenabled RADMON. Almost immediately RADMON tripped and SCS 107 ran. At that time, LETG was moving, so it stopped at ~45 deg. At the pass late last night we checked the data and found fewere than expected error log entries, probaly due to LETG being in motion, but an entry that LETG motion had failed. Momentum is OK. We need to watch the EPHIN temperature. We ran CAPs to reenable sun position and momentum monitoring and switch to FMT 2. We need to investigate why SCS 107 ran. There were no high EPHIN readings that would explain it. We also need to modify existing procedures for retracting the LETG since we haven't retracted from a 45 degree angle previously. We also need a flight software patch to reset a flag in the grating software before we can resume observing. We are having difficulty commanding ASVT, which we need for testing the above procedures. We are working that issue. It appears that the link between the Chandra Ops Gateway and ASVT needs to be refreshed. Presently ASVT cannot tell if the link is working. We are planning to command the retraction at today's 2050 UTC pass. We will ask for more comm time for both the maneuver and the grating retraction. GOT/IST: AT&T rep coming today to inspect T1 links. DATA: No new QLs. SOT: Notes from radiation telecons yesterday and last night: "At 5PM EDT the GOES P2 (EPHIN P4GM surrogate) indicated that the EPHIN rate was likely to be below the 1/3 trip level. ACE P3 levels were somewhat elevated at ~40000 but dropping. Eric noted that there was an indication in the ACE and SOHO solar-wind data that the latest shock had just passed and we might expect the ACE P3 flux to fall more rapidly. The current P3 level if maintained for the entire orbit is higher than the bare ACIS fluence budget. However, the first 35ks of the orbit is HRC-S/LETG allowing some time for the ACE flux to drop before ACIS is exposed. The ACIS observations are 50ks bare ACIS followed by ~50ks ACIS/HETG and ~10ks bare ACIS to complete the orbit. The anticipated low-E proton exposure to ACIS was deemed acceptable. At the start of comm (21:15UT the EPHIN rates were all below the 1/3 trip level. The decision was made to resume the science mission by running CAP 675 to re-enable SCS-107 and to uplink and activate the AUG2405B loads." "SCS-107 ran at 2005:236:22:38, one EPHIN sample after RADMON enable. The SCS-107 run occurred during an insertion of the LETG and as a result the insertion did not complete. The LETG potentiometer angle reads 44.21 degrees. A real-time procedure will be required to retract the LETG along with a flight software patch to reset a flag in the grating software before we can resume observing. Initial work on the development and test of the procedure will be performed overnight. MEETINGS -------- There will be a CAP review for the LETG retraction this afternoon. Time is TBD. The FDB at 2:00 may be canceled if necessary. Data ---- On colossus (/dsops/GOT/input), - Aug 25 05:07 2005_236_2152_237_0447_Dump_EM_76050.gz. Evaluation of QL data --------------------- Target: SI SOT Eval. ------------------- ---------- ---------- (no new data) --------------------- NOTES/ISSUES/PROBLEMS --------------------- SNAPSHOT -------- UTC 2005:237:12:29:01 (Aug25) f_ACE 5.90e+03 F_CRM 0.00e+00 Kp 3.7 R km 117466A OBT 2005:237:12:24:04 CTUVCDU 8461183 OBC s/w NRML FMT2_NORM CPEstat NORM OBT 241359844.98 ONLVCDU 8461168 OBC Errs 0 OBSID 5583 EPState SUN SIM TTpos -99615 HETG Angle 79.09 PCADMODE NPNT RA 110.134 Bus V 29.93 SIM FApos -990 LETG Angle 44.21 PCONTROL NPNT Dec -31.437 Bus I 31.02 AOFSTAR GUID Roll 128.045 ACA Object SSSSSSSS Dither ENAB HRC-I HV ON ACA ImFunc NNNTTTTT Dith Yang -5.94 Yaw Rate -0.14 HRC-S HV OFF ACA CCD Temp -15.6 Dith Zang 0.74 Pitch Rate 0.22 SHLD HV 0.0 ACA Int Time 1.698 Roll Rate -0.03 EVT RT 0 AOACSTAT OK FSS SunBeta SUN SHLD RT 0 FSS Alfa -0.86 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta 30.08 Batt 2 SOC 100.00% ACIS Stat7-0 67 Avg OBA Temp 53.60 SA Resolv 59.65 Batt 3 SOC 100.00% Cold Rad -127.9 OBA Tavg Fault NFLT SA Sun Pres ILLM Warm Rad -82.0 OBA Trng Fault NFLT +Y SA Amps 15.26 RadMon DISA HRMA power 47.00 SCS 128 INAC -Y SA Amps 15.26 EPHIN Geom LARG OBA power 46.70 SCS 129 INAC +Y SA Temp 110.20 E150 450.7 SCS 130 INAC -Y SA Temp 111.12 E300 9.8 Roll Mom. 0.731 SCS 107 DISA E1300 0.1 Pitch Mom. -0.469 UpL Cmd Acc 48732 EPH A-Leak 1.0200 P4GM 16.0 Yaw Mom. -1.398 Cmd Rej A 254 EPH B-Leak 0.7800 P41GM 0.0 EPH temp 88.40 Gyro 2 Curr 1 103.20 Roll Bias -0.9284 M Unload MON Gyro 2 Curr 2 98.40 Pitch Bias -2.0559 CTX A PWR 36.43 TSC Move STOP Prop. line 03 123.15 Yaw Bias -1.1832 CTX A Volts 3.52 FA Move STOP Prop. line 04 86.72 OTG Move ENAB