Last week the observing schedule was halted twice due to high radiation associated with solar flare activity. The loads were halted on Apr 19 at 10:15am EDT through a ground command to execute the SI Safing SCS 107. This ensured that the accumulated radiation dose for ACIS remained below the allowed threshold. Loads were restarted at 1:43pm EDT on Apr 20.
The second interruption occurred on Apr 21 at 12:52am EDT from an autonomous trip of the radiation monitor and execution of SCS 107. In both cases, all spacecraft actions completed nominally. Observations were resumed following the second interruption at 5.30pm on Apr 23. A total of 228Ks of science was lost due to the two events, and the impacted targets will be rescheduled in a future load.
ACIS/Radiation Environment correlationsCTI analysis is now computed with "detrending" derived from reject counters for all imaging CCDs
Average of ACIS-I CCDs (MnKa) slope 1.100e-8 CTI/day
Detrended slope 1.034e-8 CTI/day
The following pixels consistently showed a bias level more than 5 sigma away
the chip's mean level during this period.
We suspect some of the recurring bad pixels may be due to biases which
are taken just after perigee, when the focal plane is somewhat warm.
For more information see the link above and MTA monthly reports.
CCD0 | CCD2 | CCD3 | CCD4 | CCD5 | CCD6 | CCD7 | CCD8 | CCD9 | |
---|---|---|---|---|---|---|---|---|---|
New this week/ Reappeared | |||||||||
Previously reported - still observed | (995,200) | (483,816) | (811,637) | (227,467) |
(1-3,775-1024) (226,565) (232-245,313) (509,spurious rows) (510-511,775-1024) (512,775) (513,776-1024) (514,786) (514,850) (514,871) (514,940) (514,780)(514,783) (514,798-799)(514,803) (514,806-807)(514,818) (514,828) (515,1) (515,2) (607,281) (1022,4) (1022,166) |
(360,249) (766,501) |
(1-3,1-114) (1-3,775-1024) (4,spurious rows) (509,spurious rows) (510-511,775-1024) (512,775) (513-515,775-1024) (516,spurious rows) (1021,1) (1021,198) (1021,408) (1021,531) (1021,546) (1021,610) (1021,684) (1022,775) |
(62,482) (587,544) (952,1) | (150,373) |
Previously reported - not observed during this period |
Day (DOY) | Temp (C) | Width (Days) | |
---|---|---|---|
110.94 | -114.70 | 0.36 | |
113.57 | -114.05 | 0.40 |
"Prob" means that there was probably bad time data included in the manual runs. This will be corrected in future processing.
OBSID | DETECTOR | GRATING | TARGET | ANALYSIS | ACA |
---|---|---|---|---|---|
3116 | ACIS-S | NONE | 1046-409 | OK | OK |
2526 | ACIS-S | HETG | NGC2362 | OK /OK | OK |
3117 | ACIS-S | NONE | 1145-676 | OK | OK |
3492 | ACIS-S | NONE | RXJ170930.2-263927 | OK | OK |
2953 | ACIS-I | NONE | SGRA* | OK | OK |
3043 | ACIS-S | NONE | NGC4038/NGC4039 | OK | Missing |
Trends last reported on
Jan 31.
Computed HRMA Gradients | ||||||
MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
AFTBLKHDT | 2.836e+02 | 5.497e-01 | 7.659e-02 | -4.533e-01 | K | AFT BULKHEAD TEMP |
FWBLKHDT | 2.835e+02 | 8.359e-02 | 6.221e-02 | 0.000e+00 | K | FORWARD BULKHEAD TEMP |
HRMAAVG | 3.050e+02 | 4.547e+00 | -5.488e+00 | 1.957e+00 | K | AVG OF HRMA METRICS |
HRMACAV | 2.941e+02 | 4.556e-03 | 1.594e-04 | 0.000e+00 | K | HRMA CAVITY AVG TEMP |
HRMARADGRD | -6.283e-02 | 4.509e-03 | -3.152e-03 | 0.000e+00 | K | HRMA RADIAL GRAD |
HRMARANGE | 3.058e+00 | 1.327e-02 | 1.603e-01 | 0.000e+00 | K | HRMA TOTAL TEMP RANGE |
HRMASTRUTRNGE | 4.160e+00 | 1.747e-01 | 3.088e+00 | -6.703e-03 | K | HRMA STRUT TEMP |
HRMAXGRD | 9.895e-02 | 3.069e-03 | 7.621e-04 | 0.000e+00 | K | HRMA AXIAL GRAD |
MZOBACONE | 2.845e+02 | 4.289e-01 | 1.413e-01 | -7.514e-01 | K | -Z SIDE OBA CONE |
OBAAVG | 2.837e+02 | 9.675e-02 | 4.781e-02 | 0.000e+00 | K | OBA/TFTE TEMP |
OBAAXGRD | -4.225e-02 | 5.618e-01 | -1.059e-02 | -8.890e-02 | K | OBA AXIAL GRAD |
OBACONEAVG | 2.838e+02 | 1.126e-01 | 4.538e-02 | 0.000e+00 | K | OBA CONE AVG TEMP |
OBADIAGRAD | 1.567e+00 | 4.320e-01 | -1.039e+00 | -8.690e+00 | K | OBA DIAM GRAD |
PZOBACONE | 2.830e+02 | 2.434e-02 | 3.614e-03 | 0.000e+00 | K | +Z SIDE OBA CONE |
SCSTRUTRNGE | 1.896e+00 | 8.059e-01 | 1.054e+01 | -2.628e-02 | K | SC STRUT TEMP |
TFTERANGE | 2.673e+01 | 1.638e-01 | -1.509e+00 | 0.000e+00 | K | TFTE VENT/RAD TEMP |