Apr_05_2000_M257.txt Shift M257 Start at 2000:096:19:00:00 GMT = 2000 Apr 05 3:00pm EDT End 2000 Apr 05 7:00pm EDT See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Apr_05_2000_M257.txt SOT Lead Bill Podgorski SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running APR0400B, TOO load, observing MCG -6-30-15 with ACIS-S + HETG, obsid 433. This observation will last until day 097 at 1843 UTC. On upward leg of orbit. Watch ACE carefully as there is a solar flare ongoing. Monitor EPHIN in real-time pass to see how close we are to an SCS 107 (SI safing action). P4GM channel was at 2000 in last reading of last pass, within a factor of 2 of its trigger level (3542.40). ORBITAL EVENTS: 2000:094:21:04:35.941 91 EAPOGEE ORBIT APOGEE 2000:096:04:47:34.454 91 EPERIGEE ORBIT PERIGEE 2000:097:12:31:46.991 92 EAPOGEE ORBIT APOGEE 2000:098:20:14:59.823 92 EPERIGEE ORBIT PERIGEE 2000:100:03:59:45.416 93 EAPOGEE ORBIT APOGEE EVENTS DONE OBSID -------------- ---- ----- Start Shift LOS 096:1900 AOS DSS-54 (Madrid) 096:2220 433 All is nominal (see note 1) EPHIN P4GM levels are 1300 - 2000 ACE Flux in 130 - 214 keV is 4700 096:2236 Will take no action now (called Dan S. and Paul P.) (see note 2) End of shift 096:2300 NOTES/ISSUES/PROBLEMS --------------------- 1) Chandra's state at 096:2220 was: WAS EXPECTED PCAD MODE = NPNT NPNT CONTROL LAW FLAG = NPNT NPNT Stars: = 5 5 FIDS = 3 3 RA = 203.964147 deg 203.96416 DEC = -34.315130 deg -34.31513 ROLL = 18.980190 deg 18.98019 Format = 2 2 OBSID = 433 433 SIM FA = -467 -468 SIM TSC = 74423 74424 HETGA = 6.33 deg (IN) IN HETGB = 6.33 deg (IN) IN LETGA = 80.21 deg (OUT) OUT LETGB = 79.08 deg (OUT) OUT EPHIN A-leak = 0.2600 B-leak = 0.0440 ACE Proton Flux = 4635 (2 hr avg in 130-214 keV proton channel) Fluence (130-214KeV) = 3.3E+7 LT 3.6E+8 Radiation Level OK EPHIN Geom = LARG E1300 = 1 LT 1318.52 (RADMON P4GM = 1300-2000 LT 3542.40 Triggers) P41GM = 0 LT 100.00 HRC SP PS = ON IM PS = OFF SP Top Step = 43 SP Bot Step = 54 Shield 1 HV = OFF Shield 2 HV = ON Shield 2 Stp = 8 Valid Event Rate 1 = 0 Valid Event Rate 2 = 0 Shield Event Rates = 4500 ACIS FP Temp = -119.7 Cold Radiator = -127.9 DEA Pwr = 49.0 DPA Pwr = 40.3 2) ACE Orbital Fluence Calculations: ACIS out of the focus = 98:1236 ACIS in the focus = 96:1152 ------------------------------- Time exposed = 2days + 44 minutes = 175440 seconds At current ACE flux of 2561 in 130 - 214 keV proton channel we would have an orbital fluence of: 4.5E+8, about 1/2 of the orbital fluence trigger level of 1.0E+9 So we need a flux of about 5000 in ACE protons to integrate to a fluence at the orbital discussion trigger level. The 2 hour "worry trigger" level requires an ACE level of 3.6E+8/7200 = 50000 At 096:2242 ACE 2h avg flux in 130 - 214 keV is 4900. However, HETG is in and provides some added protection.