ACIS
ACIS DOSE Registered-Photon-Map
The steps we took to compute the dose map are;
- Level 1 Event files for a specified month are obtained from archive.
- Image data including I2, I3, S2, S3 CCDs are extracted from all event files.
- All the extracted image data were merged to create a month long exposure map for the month.
- The exposure map is opened with ds9, and check a distribution of count rates against energy. From this, estimate the upper threshold value. Any events beyond this upper threshold are assumed erroneous events such as bad pixels.
- Using this upper threshold, the data is filtered, and create a cleaned exposure map for the month.
- The exposure map from each month from the Sep 1999 is added up to create a cumulative exposure map for each month.
- Using fimgstatistic, we compute count rate statistics for each CCDs.
- For observations with high data drop rates (e.g., Crab nebula, Cas A), we corrected the observations by adding events.
Please check more detail plots at Telemetered Photon Dose Trend page.
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Statistics: # IMAGE NPIX MEAN RMS MIN MAX ACIS_apr22 6004901 5.806 8.350 0.0 5522 I2 node 0 262654 8.047853 3.519108 0.0 124.0 I2 node 1 262654 8.725037 3.828240 0.0 214.0 I2 node 2 262654 8.972266 4.254000 0.0 142.0 I2 node 3 262654 9.048601 6.454863 0.0 2508.0 I3 node 0 262654 9.168468 4.185954 0.0 129.0 I3 node 1 262654 9.211194 8.413883 0.0 2874.0 I3 node 2 262654 8.834487 3.633036 0.0 110.0 I3 node 3 262654 8.250340 4.209055 0.0 1197.0 S2 node 0 262654 5.868015 11.133769 0.0 5522.0 S2 node 1 262654 6.086516 3.052825 0.0 232.0 S2 node 2 262654 6.268876 6.808293 0.0 2493.0 S2 node 3 262654 6.118495 3.830268 0.0 903.0 S3 node 0 262654 7.057215 4.753786 0.0 121.0 S3 node 1 262654 8.505423 3.812340 0.0 723.0 S3 node 2 262654 7.792249 3.074433 0.0 32.0 S3 node 3 262654 6.616608 2.822019 0.0 29.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2560.662 3285.389 0.0 141217 I2 node 0 262654 2217.763894 446.233112 475.0 13475.0 I2 node 1 262654 2332.753545 634.729712 492.0 129664.0 I2 node 2 262654 2360.740208 500.339337 512.0 14033.0 I2 node 3 262654 2366.474319 611.640189 480.0 28852.0 I3 node 0 262654 2544.389599 625.863338 478.0 13720.0 I3 node 1 262654 2625.733312 1732.613472 507.0 55800.0 I3 node 2 262654 2341.045732 439.574493 477.0 13916.0 I3 node 3 262654 2325.841564 470.101802 445.0 34738.0 S2 node 0 262654 2982.410386 483.308890 1618.0 22340.0 S2 node 1 262654 3161.032653 717.402110 1803.0 17115.0 S2 node 2 262654 3496.658548 719.093413 2220.0 29881.0 S2 node 3 262654 3458.481134 572.298430 1955.0 71613.0 S3 node 0 262654 5313.773116 2908.414194 2322.0 53762.0 S3 node 1 262654 6513.227292 2358.591857 0.0 42144.0 S3 node 2 262654 5244.834298 1337.938787 2398.0 27184.0 S3 node 3 262654 4104.612842 752.558530 2475.0 26417.0
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The Mean Detrended CTI
We report CTIs with a refined data definition. CTIs were computed for the temperature dependency corrected data. Please see CTI page for detailed explanation. CTI's are computed for Mn K alpha, and defined as slope/intercept x10^4 of row # vs ADU. Data file: here
Imaging CCDs
Spectral CCDs
Backside CCDs
Focal Plane Temperature
Apr 2022 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -107.53 | +/- 7.43 C |
| Mean Width: | |
| 0.8 | +/- 0.46 days |
Averaged Focal Plane Temperature
We are using 10 period moving averages to show trends of peak temperatures and peak widths. Note, the gaps in the width plot are due to missing/corrupted data.
Focal Plane Temperature, Sun Angle and Altitude
Bad Pixels
The plots below were generated with a new warm pixel finding script. Please see Acis Bad Pixel Page for details.
Front Side CCDs
Back Side CCD (CCD5)
Science Instrument Background Rates
| Name | Low (keV) | High(KeV) | Description |
|---|---|---|---|
| SSoft | 0.00 | 0.50 | Super soft photons |
| Soft | 0.50 | 1.00 | Soft photons |
| Med | 1.00 | 3.00 | Moderate energy photons |
| Hard | 3.00 | 5.00 | Hard Photons |
| Harder | 5.00 | 10.00 | Very Hard photons |
| Hardest | 10.00 | Beyond 10 keV |
HRC
DOSE of Central 4K Pore-Pairs
Please refer to Maximum Dose Trends for more details.
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_04_2022.fits 16777216 na na na na
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_04_2022.fits 16777216 na na na na
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Max dose trend plots corrected for events that "pile-up"
in the center of the taps due to bad position information.
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Gratings
Grating Trends/Focus
We plot the width of the zero order streak of ACIS/HETG observations and the width of the zero order image for HRC/LETG observations of point sources. No significant defocusing trend is seen at this time. See Gratings Trends pages.
Gratings Resolving Power
We plot E/dE vs. E for fits to detected lines with fwhm_error/fwhm less than 0.15 for the plus and minus arms of HEG, MEG, and LEG. Also shown are conservative (dotted line) and optimistic (dashed line) pre-launch resolving power expectations.
We have selected only calibration observations of Capella, HR1099, and Sigma Gem. See MIT technotes for a parallel analysis.
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| Metg minus side | Metg plus side |
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| Hetg minus side | Hetg plus side |
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PCAD
ACA Trending
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Gyro Bias Drift
Radiation History
Radiation Count Rates of Apr 2022
Sun Spot History (See:NOAA Page)
SIM
SIM Shift and Twist
SIM Shift and Twist Trend The following plots show trends of SIM shifts (dy and dz) and twist (dtheta). All quantities are directly taken from pcaf*_asol1.fits files. The units are mm for dy and dz, and degree for dtheta. We fit three lines separated before and after (Days of Mission)= 1400 (May 21, 2003), 2700 (Dec 11, 2006), and 4400 (Aug 07, 2011). The unit of slopes are mm per day or degree per day.
The sudden shift around DOM = 1400, 2700 and 4400 are due to fid light drift (see a memo by Aldcroft fiducial light drift). On the dtheta plot, two tracks are clearly observed. The track around 0.01 is due to HRC-I, and all others are clustered around -0.002. For more detail, please see SIM Shift and Twist Trend page
Trending
Quarterly Trends
- EPS Batteries
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| eb2ci | off | -3.212e-04 | 3.211e-05 | 0.34 +/- 0.08 | -0.00 +/- 0.00 | AMP | BATT 2 CHARGE CURRENT | on | 9.548e-04 | 9.034e-04 | 0.34 +/- 0.05 | (0.00+/-0.00)e0 |
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| eb2di | off | -4.117e-04 | 7.588e-05 | 0.02 +/- 0.18 | -(9.81+/-50.19)e-6 | AMP | BATT 2 DISCHARGE CURRENT | on | -0.003 | 0.022 | 0.28 +/- 1.15 | (0.00+/-0.00)e0 |
| eb2v | off | 0.001 | 3.538e-05 | 32.43 +/- 0.09 | 0.00 +/- 0.00 | V | BATT 2 VOLTAGE | on | 0.006 | 0.011 | 32.20 +/- 0.56 | (0.00+/-0.00)e0 |
| ecnv1v | -1.992e-05 | 2.942e-06 | 14.89 +/- 0.01 | (9.12+/-4.91)e-4 | V | CONV 1 +15V OUTPUT | |
| ecnv2v | -6.000e-05 | 3.549e-06 | 14.84 +/- 0.01 | 0.00 +/- 0.00 | V | CONV 2 +15V OUTPUT | |
| ecnv3v | -1.979e-05 | 2.253e-06 | 15.29 +/- 0.01 | (4.55+/-4.72)e-4 | V | CONV 3 +15V OUTPUT | |
- Spacecraft Electronics
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| elbi | -7.172e-04 | 5.955e-04 | 53.33 +/- 1.39 | 0.12 +/- 0.19 | AMP | LOAD BUS CURRENT | |
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| elbv | off | 0.003 | 5.441e-05 | 27.90 +/- 0.17 | 0.01 +/- 0.02 | V | LOAD BUS VOLTAGE | on | 0.005 | 0.004 | 28.71 +/- 0.22 | (0.00+/-0.00)e0 |
- OBA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| oobthr04 | 0.009 | 5.810e-04 | (3.02+/-0.01)e2 | -0.30 +/- 0.44 | K | RT 27: HRMA STRUT | |
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| oobthr12 | 0.013 | 8.932e-04 | (3.00+/-0.02)e2 | -0.15 +/- 0.68 | K | RT 35: OBA CONE | |
| oobthr26 | 0.018 | 0.001 | (3.03+/-0.03)e2 | -0.45 +/- 0.99 | K | RT 48: OBA CONE | |
| oobthr38 | 4.551e-05 | 5.767e-06 | (2.83+/-0.00)e2 | 0.01 +/- 0.00 | K | RT 60: TFTE CONE | |
| oobthr44 | 0.012 | 9.449e-04 | (3.03+/-0.02)e2 | -0.59 +/- 0.76 | K | RT 66: TFTE COVER | |
| oobthr50 | 0.007 | 7.403e-04 | (2.98+/-0.02)e2 | -0.55 +/- 0.61 | K | RT 76: S/C STRUT | |
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
