Oct_28_2003_M1559.txt Shift M1559 Start at 2003:301 20:00 UTC = 2003 Oct 28 3:00 pm EST End at 2003 Oct 28 5:00 pm EST SOT shift report 2003-10-28 M1559 See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Oct_28_2003_M1559.txt SOT Lead Robert Cameron SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - No load running. The OCT2803B load stopped due to high radiation, after an autonomous SCS 107 run at 2003:301:13:02:04 UT, because of an X17 solar flare from Active Region 486 on the Sun. The OCT2803B load never really got started, and so the obsid is still 60497, so Chandra is at the final attitude of the OCT2603 load. Radiation will be discussed today at 5:00pm EST, to assess when the science mission can resume. Summary from 5pm EST radiation telecon: SCS107 ran autonomously today at 301:03:02, due to high radiation from the X17 solar flare. SCS107 ran nominally. Low energy solar proton fluxes are still increasing. The expected time range for the arrival of a shock at the Earth from this event is 302:0000 UT to 302:2100 UT, with a best guess time of 302:0800 UT. Our best guess plan for resuming science is to resume after the next perigee, with science observations starting at about 304:0530 UT, which is 45.5 hours after the best guess shock arrival time. FOT MP is proceeding with planning for that timeline. FOT MP tomorrow will build a load with this science resumption, and with a maneuver to an attitude for momentum management on the descending leg of the present orbit. This maneuver would occur at about 303:1000 UT, with an associated load uplink opportunity at 303:0345 UT (tomorrow night). The load would be built with the maneuver in a separate SCS, that can be uplinked and activated without initiating any science. This maneuver could be performed without enabling RADMON and SCS107. However, ACIS would like to perform a CTI measurement on the descending leg of the current orbit. If this CTI is approved, then RADMON and SCS107 would be enabled to protect ACIS. (We should be conservative in approving the ACIS CTI based on expected radiation rates, to prevent yet another SCS107 trip and associated replan cycle). The load will be built with a RADMON disable before perigee, and the ACIS team would initiate the CTI by ground commanding using a CAP. A go/nogo for actual science resumption in the next orbit would be in the 304:0340 UT comm pass, for resuming science at 304:0530. FOT MP will include obsid 5240, the TOO for XTE J1810-197 in the load. We will re-assess radiation and load planning and building at the 9am EST telecon tomorrow on 405 244 5050, pin 1159#. We can expect FOT MP to go ahead and build products for the above plan, with products released and reviewed tomorrow, to be ready for uplink at 303:0345 UT. Seq # ObsID It Target start time SI Grat RA dec roll ----------------------------------------------------------------------------------------------------- ORBITAL EVENTS: 2003:301:06:16:07.596 583 EPERIGEE ORBIT PERIGEE 2003:302:13:59:15.020 584 EAPOGEE ORBIT APOGEE 2003:303:21:43:31.304 584 EPERIGEE ORBIT PERIGEE 2003:305:05:26:58.729 585 EAPOGEE ORBIT APOGEE 2003:306:13:10:34.451 585 EPERIGEE ORBIT PERIGEE 2003:307:20:54:45.086 586 EAPOGEE ORBIT APOGEE 2003:309:04:38:07.561 586 EPERIGEE ORBIT PERIGEE 2003:310:12:22:40.962 587 EAPOGEE ORBIT APOGEE 2003:311:20:06:32.771 587 EPERIGEE ORBIT PERIGEE 2003:313:03:50:58.858 588 EAPOGEE ORBIT APOGEE 2003:314:11:35:29.516 588 EPERIGEE ORBIT PERIGEE 2003:315:19:19:29.654 589 EAPOGEE ORBIT APOGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift 301:2000 AOS DSS-24 (Goldstone 34m) 301:2030 60497 (load stopped) LOS DSS-24 (Goldstone 34m) 301:2130 End of shift 301:2200 NOTES/ISSUES/PROBLEMS --------------------- 1) Status at 301:2050: UTC 2003:301:20:50:03 (Oct28) f_ACE 1.81e+04 F_CRM 7.60e+08 Kp 1.3 R km 100651A OBT 2003:301:20:49:29 CTUVCDU 1790463 OBC s/w NRML FMT2_EPS CPEstat NORM OBT 183761369.55 ONLVCDU 1790448 OBC Errs 0 OBSID 60497 EPState SUN SIM TTpos -99616 HETG Angle 79.46 PCADMODE NPNT RA 10.999 Bus V 29.61 SIM FApos -715 LETG Angle 77.59 PCONTROL NPNT Dec 35.001 Bus I 30.01 AOFSTAR GUID Roll 225.729 ACA Object SSSSSSSS Dither ENAB HRC-I HV ON ACA ImFunc TTTTRTNN Dith Yang -1.63 Yaw Rate -0.07 HRC-S HV OFF ACA CCD Temp -15.6 Dith Zang 4.61 Pitch Rate 0.00 OBSMode NEXT ACA Int Time 1.698 Roll Rate 0.04 Door OP UNAC AOACSTAT OK FSS SunBeta NSUN Door CL UNAC FSS Alfa -49.64 Batt 1 SOC 100.00% Avg HRMA Temp 70.61 FSS Beta -49.78 Batt 2 SOC 100.00% ACIS Stat7-0 67 Avg OBA Temp 51.13 SA Resolv 151.12 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 14.49 RadMon DISA HRMA power 45.00 SCS 128 INAC -Y SA Amps 15.07 EPHIN Geom SMAL OBA power 74.60 SCS 129 INAC +Y SA Temp 115.12 E150 24097.6 SCS 130 INAC -Y SA Temp 116.22 E300 1292.7 Roll Mom. 0.657 SCS 107 DISA E1300 658.5 Pitch Mom. -1.814 UpL Cmd Acc 27379 EPH A-Leak 1.0200 P4GM 664.0 Yaw Mom. 1.920 Cmd Rej A 230 EPH B-Leak 0.3320 P41GM 174.8 Gyro 1 Curr 1 9.60 Roll Bias -0.5196 Gyro 1 Curr 2 9.60 Pitch Bias -1.8719 Gyro 2 Curr 1 103.20 Yaw Bias -0.8778 Gyro 2 Curr 2 98.40 Current Data: UTC 2003:301:20:50:03 (Oct28) f_ACE 1.81e+04 F_CRM 7.60e+08 Kp 1.3 R km 100651A Currently scheduled FPSI, OTG : HRC-S NONE Estimated Kp : 1.33 ACE EPAM P3 Proton Flux (p/cm^2-s-sr-MeV) : 1.81e+04 GOES-10 P2 flux, in RADMON P4GM units : 3.18 GOES-12 P2 flux, in RADMON P4GM units : 5.06 GOES-10 P5 flux, in RADMON P41GM units : 46.48 GOES-12 P5 flux, in RADMON P41GM units : 66.74 Orbit Start Time : 2003:301:06:19:02 Geocentric Distance (km), Orbit Leg : 100533 A CRM Region : 2 (Magnetosheath) External Proton Flux (p/cm^2-s-sr-MeV) : 5.18283000000e+04 Attenuated Proton Flux (p/cm^2-s-sr-MeV) : 0.00000000000e+00 External Proton Orbital Fluence (p/cm^2-sr-MeV) : 6.55476163500e+09 Attenuated Proton Orbital Fluence (p/cm^2-sr-MeV) : 7.59524985000e+08 Observed Expected -------- -------- PCAD MODE = NPNT NPNT CONTROL LAW FLAG = NPNT NPNT Stars: = 6 6 FIDS = 0 0 RA = 11.0000 deg 11.0000 DEC = 35.0000 deg 35.0000 ROLL = 225.73 deg 225.73 Format = 2 2 OBSID = 60497 60497 SIM FA = -715 -716 SIM TSC = -99616 -99616 HETGA = 79.46 deg (OUT) OUT HETGB = 80.21 deg (OUT) OUT LETGA = 78.34 deg (OUT) OUT LETGB = 77.59 deg (OUT) OUT HRC IM PS = ON, 42, 53 SP PS = OFF, 0, 0 Shield 1 HV = OFF, 0 Shield 2 HV = OFF, 0 Valid Event Rate 1 = 0 Valid Event Rate 2 = 0 Shield Event Rates = 0 ACIS FP Temp = -119.7 DEA Pwr = 32.0 DPA Pwr = 12.3 Science State = Science Idle 2) Radiation The ACE radiation environment is high and steady, although likely to increase in the near future as the CME from the X17 flare arrives at the Earth. The GOES proton radiation flux is elevated and steady. ACE 2 hr fluence is 1.3e8 vs. threshold 3.6e8. CRM-based orbital fluence is 7.6e8 vs. threshold 3.0e9. Chandra is in the magnetosheath. 3) Quick Look data review (OK unless noted): Seq # ObsID Constr. Target Start Time SI Grat Comment --------------------------------------------------------------------------------------- There were no new quick-look datasets in this shift.