Nov_19_1999_M119.txt Shift M119 Start at 1999:323:21:00:00 GMT = 1999 Nov 19 4:00pm EST End 1999 Nov 19 7:00pm EST See http://asc.harvard.edu/acis/SOT_reports/sot-shift.html, or /proj/ascwww/AXAF/extra/science/htdocs/acis/SOT_reports/Nov_19_1999_M119.txt. SOT Lead Bill Podgorski SOT SC/ACA FOT-SI HRC-SI ACIS-SI OTHER Plan: - Running P26b, watching ACE proton rates. Performing CTI measurements for OBSID's 62305 and 62304. EVENTS DONE OBSID -------------- ---- ----- Start Shift 323:2100 62305 Out of contact at start of shift AOS DSS-42 (Canberra) 323:2215 62305 State at AOS was nominal (see note 1) Start second ACIS CTI meas 323:2347 62304 LOS 324:0000 End of shift 324:0000 NOTES/ISSUES/PROBLEMS --------------------- 1) Chandra's state at AOS 321:2325 was: PCAD MODE = NPNT CONTROL LAW FLAG = NPNT Stars: = 5 FIDS = 0 RA = 327.950577 deg DEC = -30.468615 deg ROLL = -71.224269 deg Format = 2 OBSID = 62305 SIM FA = -467 SIM TSC = -99616 (HRC-S) HETGA = 80.96 deg (OUT) HETGB = 81.33 deg (OUT) LETGA = 80.21 deg (OUT) LETGB = 79.08 deg (OUT) EPHIN A-leak = 0.3040 B-leak = 0.0480 ACIS = Operating, doing CTI HRC = All HV is OFF 2) The following was sent out via E-mail as the procedure to follow regarding the increased proton flux beeing seen by ACE: For the last day or so we have been seeing the proton flux (as measured by the ACE satellite) increase due to solar activity. At some point we may have to take action to safe the SI's (ACIS in particular) so as to avoid CTI degradation by these protons. As SOT lead this shift I have been discussing the situation with the FOT (Darrell Wicker, Eric Martin, et. al.) and SOT (Dan Schwartz and Rob Cameron). As a result of these discussions, Dan has directed that we follow the procedure described below in response to this event. The OC will monitor Scott Wolk's ACE web page: http://asc.harvard.edu/mta/ace.html This page contains a table of differential flux, a 2 hour Real-time Differential Electron and Proton Flux and plots of relevant ACE proton rates over various bands. The proton rate of interest is the yellow curve on the middle plot pane, protons/(cm**2-sec-sr-Mev) over the 112 to 187 keV band. Under the "2 hour Real-time Differential Electron and Proton Flux" entry in the page is the FLUENCE of protons for energies between 130 and 214 keV (FLUENCE is the last row). This fluence is computed by taking the average proton flux (over the energy band of interest) for the preceding 2 hours and multiplying by 7200 seconds, e.g., a flux of 10,000 over 2 hours would yield a FLUENCE of 7.2E+7). If this FLUENCE, as shown in the web page, should rise to 3.6E+8 then the OC should contact Eric Martin (Home: 781-662-4704, pager 800-672-4485) AND one of the following: Dan Schwartz (Cell: 617-512-5625, Home: 781-861-7233, Pager: 800-759-8352, PIN 1636502) or Rob Cameron (Cell: 617-512-5623, Home: 617-628-6085, Pager: 888-772-3038, PIN 7723038) or Scott Wolk (Cell: 617-721-4360, Home: 781-229-0130, Pager: 800-759-8352 PIN 1636500 ) The SOT rep, Eric and the OC will then decide jointly on any actions to be taken. As of this moment (5:25pm EST) the computed 2 hr FLUENCE from Scott's page is about 1.9E+8, about half of the trigger value. We have COMM from now until 324:0000 (7:00pm EST). The next two COMM's are: 324:0715 - 324:0845 (2:15am to 3:35am) 324:1645 - 324:1800 (11:45am to 1:00pm) The ACIS will go into the focal plane at 324:0215 and hence will be at risk then. 3) COMM periods over next several days: 324:0715 - 324:0845 Sat, 11/20, 2:15am to 3:45am EST 324:1645 - 324:1800 Sat, 11/20, 11:45am to 1:00pm 324:2200 - 325:0000 Sat, 11/20, 5:00pm to 7:00pm 325:0600 - 325:0800 Sun, 11/21, 1:00am to 3:00am 325:1500 - 325:1735 Sun, 11/21, 10:00am to 12:35pm 326:0055 - 326:0255 Sun, 11/21, 7:55pm to 9:55pm 4) PS: Roger is to be called to at 617 733 1843