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_jul19 6004901 7.288 39.072 0.0 7352 I2 node 0 262654 5.661815 2.846934 0.0 49.0 I2 node 1 262654 5.972424 7.474819 0.0 3485.0 I2 node 2 262654 5.760901 2.821066 0.0 57.0 I2 node 3 262654 5.756744 2.988337 0.0 179.0 I3 node 0 262654 6.051444 3.002349 0.0 216.0 I3 node 1 262654 5.926932 13.071973 0.0 4638.0 I3 node 2 262654 5.618341 2.758455 0.0 65.0 I3 node 3 262654 5.878352 7.877065 0.0 3743.0 S2 node 0 262654 8.358601 13.839823 0.0 5359.0 S2 node 1 262654 9.325163 12.252664 0.0 629.0 S2 node 2 262654 11.521117 20.586136 0.0 3671.0 S2 node 3 262654 12.345313 19.459749 0.0 1506.0 S3 node 0 262654 24.943470 173.726319 0.0 7352.0 S3 node 1 262654 14.199374 18.058951 0.0 1482.0 S3 node 2 262654 13.100157 20.640655 0.0 372.0 S3 node 3 262654 12.867888 23.244366 0.0 406.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2314.204 2992.223 0.0 129665 I2 node 0 262654 2003.284591 398.423543 426.0 11532.0 I2 node 1 262654 2108.011858 558.674187 441.0 95930.0 I2 node 2 262654 2137.261084 452.620909 445.0 11600.0 I2 node 3 262654 2142.443800 553.154064 428.0 28586.0 I3 node 0 262654 2278.766168 562.224005 420.0 8939.0 I3 node 1 262654 2360.748674 1700.783077 446.0 55367.0 I3 node 2 262654 2083.348997 387.419767 421.0 11912.0 I3 node 3 262654 2074.872042 416.497981 378.0 32319.0 S2 node 0 262654 2695.426735 424.865164 1508.0 21903.0 S2 node 1 262654 2857.405050 639.209876 1667.0 15685.0 S2 node 2 262654 3159.636546 646.387514 2102.0 27799.0 S2 node 3 262654 3111.209273 499.489094 1861.0 59237.0 S3 node 0 262654 4765.900103 2234.691385 2098.0 30816.0 S3 node 1 262654 6000.105906 2271.757038 0.0 29620.0 S3 node 2 262654 4755.701053 1266.975247 2044.0 25501.0 S3 node 3 262654 3672.448876 667.930791 2254.0 25015.0
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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
Jul 2019 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -110.64 | +/- 3.65 C |
| Mean Width: | |
| 1.0 | +/- 0.38 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 |
The following three plots show trends of SIB from year 2000. CCDs shown here are CCD3, CCD5, and CCD7. Fitted lines are linear fit after eliminating extreme outliers. For >10 keV plots, 2 lines are fit. One is with a 13 keV filter, and another without.
CCD 3
CCD 5
CCD 7
ACIS Corner Pixels
We plot the average corner pixel centroid slope and mean for ACIS observations. Separate plots are shown for FAINT MODE (3X3) and VFAINT MODE (5X5) observations. Metric is the centroid of a Gaussian fit to the histogram of corner pixel PHA values of detected events. Plus signs are FAINT observations, diamonds are VFAINT observations, and boxes are VFAINT observations with centroids computed using only the corner pixels of a 3X3 event island (referred to as AFAINT). We see a very small upward trend.
CCD: I3
CCD: S3
ACIS Bias Trends
The bias plus overclock level was calculated as follows:
- Get acisf*bias0.fits is obtained from a database or /dsops/ap/sdp/cache/*/acis/
- Data with timed mode exposure is selected.
- Fits files were divided into 4 quads, then an average of bias level for each quad is computed. No corrections for dead spots, columns etc were included.
An example of Overclock values as reported in FITS file header:
An example of mean bias minus overclock value:
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_07_2019.fits 16777216 0.127 0.358 0.000 5.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_07_2019.fits 16777216 5.907 5.818 0.000 303.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_07_2019.fits 16777216 0.132 0.807 0.000 81.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_07_2019.fits 16777216 18.238 33.374 0.000 1737.000
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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.
PCAD
ACA Trending
ACIS-1
ACIS-6
HRC-I-1
HRC-S-1
Gyro Bias Drift
Radiation History
Radiation Count Rates of Jul 2019
Sun Spot History
Trending
Quarterly Trends
- ACIS Temperature
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 1cbat | 209.228 | 2.595 | -0.003+/-0.002 | -0.011+/-0.164 | K | CAMERA BODY TEMP. A |
|---|---|---|---|---|---|---|
| 1crat | 149.631 | 3.334 | 0.005+/-0.002 | -0.087+/-0.183 | K | COLD RADIATOR TEMP. A |
| 1crbt | 150.360 | 3.385 | 0.005+/-0.002 | -0.027+/-0.186 | K | COLD RADIATOR TEMP. B |
| 1dactbt | 258.623 | 3.267 | -0.009+/-0.002 | 0.011+/-0.230 | K | DA COLLIMATOR-TOP TEMP. B |
| 1deamzt | 291.429 | 8.537 | (6.41+/-655.10)e-5 | -0.319+/-0.460 | K | DEA -Z PANEL TEMP (RT830) |
| 1dpamyt | 291.543 | 8.350 | -0.003+/-0.006 | 0.200+/-0.509 | K | DPA -Y PANEL TEMP (RT810) |
| 1dpamzt | 294.547 | 8.183 | -0.004+/-0.006 | 0.062+/-0.481 | K | DPA -Z PANEL TEMP (RT830) |
| 1oahat | 246.252 | 2.531 | -0.007+/-0.002 | 0.080+/-0.173 | K | OPEN ACTUATOR TEMPERATURE |
| 1oahbt | 242.276 | 2.338 | -0.007+/-0.002 | 0.059+/-0.152 | K | OPEN ACTUATOR HOUSING TEMP. B |
| 1pdeaat | 302.978 | 7.423 | -0.009+/-0.006 | 1.077+/-0.709 | K | PSMC DEA POWER SUPPLY TEMP A |
| 1pdeabt | 295.286 | 7.153 | -0.012+/-0.005 | 1.159+/-0.694 | K | PSMC DEA POWER SUPPLY TEMP B |
| 1pin1at | 340.955 | 11.094 | 0.022+/-0.029 | -1.773+/-0.917 | K | PSMC TEMP 1A |
| 1wrat | 192.159 | 2.562 | (-6.56+/-19.03)e-4 | 0.023+/-0.169 | K | WARM RADIATOR TEMP A |
| 1wrbt | 191.885 | 2.609 | -0.001+/-0.002 | -0.024+/-0.178 | K | WARM RADIATOR TEMP B |
- ACIS Electronics Side B
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 1dahbcu | 1.634e-06 | 1.947e-05 | (0.00+/-0.00)e0 | (2.23+/-0.68)e-6 | AMP | DETECTOR ASSY. HTR CURRENT B |
|---|---|---|---|---|---|---|
| 1dahbvo | 0.000e+00 | 0.000e+00 | (0.00+/-0.00)e0 | (0.00+/-0.00)e0 | V | DETECTOR ASSY. HTR VOLTAGE B |
| 1dahhbvo | 0.000e+00 | 0.000e+00 | (0.00+/-0.00)e0 | (0.00+/-0.00)e0 | V | DA HOUSING HTR +28V INPUT B |
| 1de28bvo | 28.134 | 0.253 | 0.004+/-0.000 | -0.035+/-0.010 | V | DEA +28V INPUT B |
| 1deicbcu | 16.390 | 0.022 | (-3.04+/-1.60)e-5 | 0.003+/-0.002 | AMP | DEA INPUT CURRENT B |
| 1den0bvo | -0.156 | 0.019 | (2.97+/-1.43)e-5 | (-3.42+/-14.77)e-4 | V | DEA -6V VOLTAGE B |
| 1den1bvo | -0.330 | 0.048 | (3.52+/-3.65)e-5 | (5.75+/-36.86)e-4 | V | DEA -15V VOLTAGE B |
| 1dep0bvo | 0.051 | 0.018 | (-1.84+/-1.35)e-5 | (-4.02+/-13.55)e-4 | V | DEA +6V VOLTAGE B |
| 1dep1bvo | 0.134 | 0.046 | (-4.84+/-3.50)e-5 | (-1.59+/-34.94)e-4 | V | DEA +15V ANALOG B |
| 1dep2bvo | 0.208 | 0.071 | (-6.75+/-5.37)e-5 | (-5.41+/-53.51)e-4 | V | DEA +24V ANALOG B |
| 1dep3bvo | 0.257 | 0.089 | (-9.47+/-6.78)e-5 | (-8.58+/-67.51)e-4 | V | DEA +28V ANALOG B |
| 1dp28bvo | 28.148 | 0.249 | 0.004+/-0.000 | -0.035+/-0.009 | V | DPA +28V INPUT B |
| 1dpicbcu | 0.893 | 0.324 | (-1.62+/-2.50)e-4 | -0.011+/-0.024 | AMP | DPA INPUT CURRENT B |
| 1dpp0bvo | 5.217 | 0.046 | (-3.29+/-3.54)e-5 | -0.002+/-0.003 | V | DPA +5V ANALOG B |
- EPHIN Temperature and Voltage
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 5eiot | 315.591 | 26.451 | -0.056+/-0.020 | 0.054+/-1.362 | K | EIO TEMP |
|---|---|---|---|---|---|---|
| 5ephint | 327.585 | 6.847 | -0.022+/-0.005 | 0.337+/-0.499 | K | EPHIN TEMP |
| hkeboxtemp | 266.790 | 140.522 | -0.693+/-0.223 | (3.80+/-1.26)e2 | K | EPHIN HOUSEKEEPING EBOX: TEMPERATURE (5EHSE300) |
| teio | 314.490 | 26.164 | -0.028+/-0.020 | 0.727+/-1.460 | K | EPHIN ELECTRONICS HOUSING TEMP |
| tephin | 327.292 | 7.093 | -0.021+/-0.005 | 0.315+/-0.460 | K | EPHIN SENSOR HOUSING TEMP |
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
