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_jan19 6004901 7.764 12.435 0.0 2199 I2 node 0 262654 9.373582 3.919209 0.0 83.0 I2 node 1 262654 9.998715 5.748476 0.0 1965.0 I2 node 2 262654 9.742765 3.921385 0.0 114.0 I2 node 3 262654 9.722067 4.673465 0.0 1091.0 I3 node 0 262654 10.507078 6.101518 0.0 2199.0 I3 node 1 262654 10.585112 5.610241 0.0 168.0 I3 node 2 262654 10.113654 3.973637 0.0 126.0 I3 node 3 262654 10.060734 4.256798 0.0 717.0 S2 node 0 262654 9.164687 9.911055 0.0 1595.0 S2 node 1 262654 9.532341 7.768655 0.0 1074.0 S2 node 2 262654 9.879266 7.820398 0.0 643.0 S2 node 3 262654 10.139860 8.190752 0.0 687.0 S3 node 0 262654 10.940020 9.996547 0.0 253.0 S3 node 1 262654 12.507049 11.915981 0.0 734.0 S3 node 2 262654 11.937630 13.119647 0.0 295.0 S3 node 3 262654 9.513620 5.128163 0.0 257.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2266.221 2931.526 0.0 127253 I2 node 0 262654 1962.769799 389.405085 419.0 11200.0 I2 node 1 262654 2065.582809 543.512773 433.0 87531.0 I2 node 2 262654 2095.864699 444.080588 433.0 11167.0 I2 node 3 262654 2101.163180 542.913246 419.0 28536.0 I3 node 0 262654 2226.356417 550.498173 412.0 8815.0 I3 node 1 262654 2307.887009 1684.363615 437.0 55150.0 I3 node 2 262654 2034.066676 377.598085 410.0 11543.0 I3 node 3 262654 2024.885152 405.921471 367.0 31784.0 S2 node 0 262654 2636.749207 413.255854 1489.0 21831.0 S2 node 1 262654 2795.447767 623.982909 1638.0 15390.0 S2 node 2 262654 3090.425908 631.718677 2081.0 27736.0 S2 node 3 262654 3040.335372 482.582778 1838.0 56845.0 S3 node 0 262654 4665.495098 2098.053529 2054.0 27217.0 S3 node 1 262654 5892.999304 2240.463629 0.0 29077.0 S3 node 2 262654 4655.108904 1235.549821 1992.0 25098.0 S3 node 3 262654 3595.459497 650.854604 2206.0 24659.0
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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
Jan 2019 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -112.98 | +/- 1.57 C |
| Mean Width: | |
| 0.82 | +/- 0.34 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_01_2019.fits 16777216 0.025 0.157 0.000 3.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_01_2019.fits 16777216 5.625 5.729 0.000 302.000
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_01_2019.fits 16777216 17.945 32.735 0.000 1730.000
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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 Jan 2019
Sun Spot History
Trending
Quarterly Trends
- ACIS Temperature
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 1cbat | 209.285 | 2.596 | (3.18+/-1.98)e-4 | 0.675+/-0.020 | K | CAMERA BODY TEMP. A |
|---|---|---|---|---|---|---|
| 1crat | 149.139 | 2.945 | 0.002+/-0.000 | 0.726+/-0.022 | K | COLD RADIATOR TEMP. A |
| 1crbt | 149.876 | 3.033 | 0.001+/-0.000 | 0.736+/-0.022 | K | COLD RADIATOR TEMP. B |
| 1dactbt | 258.835 | 3.272 | 0.002+/-0.000 | 0.227+/-0.022 | K | DA COLLIMATOR-TOP TEMP. B |
| 1deamzt | 292.061 | 8.406 | -0.005+/-0.001 | 2.061+/-0.061 | K | DEA -Z PANEL TEMP (RT830) |
| 1dpamyt | 292.387 | 8.348 | -0.004+/-0.001 | 1.620+/-0.063 | K | DPA -Y PANEL TEMP (RT810) |
| 1dpamzt | 295.400 | 8.169 | -0.004+/-0.001 | 1.748+/-0.061 | K | DPA -Z PANEL TEMP (RT830) |
| 1oahat | 246.451 | 2.542 | 0.002+/-0.000 | 0.595+/-0.019 | K | OPEN ACTUATOR TEMPERATURE |
| 1oahbt | 242.407 | 2.368 | 0.002+/-0.000 | 0.528+/-0.017 | K | OPEN ACTUATOR HOUSING TEMP. B |
| 1pdeaat | 304.646 | 6.965 | 0.011+/-0.001 | 0.712+/-0.046 | K | PSMC DEA POWER SUPPLY TEMP A |
| 1pdeabt | 296.885 | 6.751 | 0.013+/-0.001 | 0.752+/-0.047 | K | PSMC DEA POWER SUPPLY TEMP B |
| 1pin1at | 338.713 | 11.890 | -0.046+/-0.002 | -0.546+/-0.068 | K | PSMC TEMP 1A |
| 1wrat | 192.131 | 2.608 | (-9.33+/-1.82)e-4 | 0.647+/-0.020 | K | WARM RADIATOR TEMP A |
| 1wrbt | 191.815 | 2.579 | (-5.20+/-1.85)e-4 | 0.606+/-0.019 | K | WARM RADIATOR TEMP B |
- ACIS Electronics Side B
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 1dahbcu | 1.118e-05 | 9.009e-05 | (1.23+/-9.02)e-10 | (3.62+/-0.27)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 | 1.609e-04 | 1.441e-02 | (0.00+/-0.00)e0 | (-4.03+/-0.79)e-4 | V | DA HOUSING HTR +28V INPUT B |
| 1de28bvo | 28.035 | 0.293 | -0.001+/-0.000 | 0.024+/-0.001 | V | DEA +28V INPUT B |
| 1deicbcu | 16.392 | 0.022 | (4.27+/-0.17)e-5 | 0.002+/-0.000 | AMP | DEA INPUT CURRENT B |
| 1den0bvo | -0.161 | 0.018 | (7.78+/-1.38)e-6 | (3.27+/-15.10)e-5 | V | DEA -6V VOLTAGE B |
| 1den1bvo | -0.340 | 0.045 | (3.25+/-0.36)e-5 | 0.002+/-0.000 | V | DEA -15V VOLTAGE B |
| 1dep0bvo | 0.055 | 0.017 | (-1.67+/-0.14)e-5 | (-6.75+/-1.52)e-4 | V | DEA +6V VOLTAGE B |
| 1dep1bvo | 0.145 | 0.045 | (-4.02+/-0.35)e-5 | -0.001+/-0.000 | V | DEA +15V ANALOG B |
| 1dep2bvo | 0.224 | 0.068 | (-6.13+/-0.54)e-5 | -0.001+/-0.001 | V | DEA +24V ANALOG B |
| 1dep3bvo | 0.278 | 0.087 | (-8.16+/-0.69)e-5 | -0.003+/-0.001 | V | DEA +28V ANALOG B |
| 1dp28bvo | 28.051 | 0.291 | -0.001+/-0.000 | 0.022+/-0.001 | V | DPA +28V INPUT B |
| 1dpicbcu | 0.955 | 0.305 | (-3.86+/-0.25)e-4 | -0.013+/-0.003 | AMP | DPA INPUT CURRENT B |
| 1dpp0bvo | 5.227 | 0.043 | (-4.03+/-0.35)e-5 | -0.001+/-0.000 | V | DPA +5V ANALOG B |
- EPHIN Temperature and Voltage
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 5eiot | 339.737 | 30.629 | -0.175+/-0.002 | -1.725+/-0.136 | K | EIO TEMP |
|---|---|---|---|---|---|---|
| 5ephint | 332.984 | 7.099 | -0.030+/-0.001 | -0.328+/-0.045 | K | EPHIN TEMP |
| hkeboxtemp | 324.949 | 72.735 | -0.043+/-0.003 | -11.584+/-3.783 | K | EPHIN HOUSEKEEPING EBOX: TEMPERATURE (5EHSE300) |
| teio | 324.331 | 24.204 | -0.062+/-0.002 | -1.497+/-0.137 | K | EPHIN ELECTRONICS HOUSING TEMP |
| tephin | 333.026 | 7.222 | -0.032+/-0.001 | -0.434+/-0.045 | 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
