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_jul20 6004901 9.788 14.916 0.0 1169 I2 node 0 262654 6.469988 3.088687 0.0 42.0 I2 node 1 262654 6.759886 3.327130 0.0 111.0 I2 node 2 262654 6.732387 3.109891 0.0 58.0 I2 node 3 262654 6.590986 3.633137 0.0 766.0 I3 node 0 262654 9.390450 3.982402 0.0 212.0 I3 node 1 262654 9.779905 4.076578 0.0 112.0 I3 node 2 262654 9.431732 3.873757 0.0 84.0 I3 node 3 262654 8.858404 3.854565 0.0 117.0 S2 node 0 262654 11.791785 4.620767 0.0 104.0 S2 node 1 262654 12.807983 6.428094 0.0 288.0 S2 node 2 262654 15.676922 13.755648 0.0 332.0 S2 node 3 262654 18.298430 23.566532 0.0 623.0 S3 node 0 262654 23.036447 28.133530 0.0 380.0 S3 node 1 262654 22.091888 20.334105 0.0 1169.0 S3 node 2 262654 21.174786 18.236106 1.0 241.0 S3 node 3 262654 16.588550 8.923676 0.0 132.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2415.518 3110.529 0.0 134781 I2 node 0 262654 2093.194926 418.159679 445.0 12268.0 I2 node 1 262654 2201.607302 589.761076 455.0 109384.0 I2 node 2 262654 2229.305460 471.425571 470.0 12625.0 I2 node 3 262654 2234.555711 576.497359 447.0 28705.0 I3 node 0 262654 2389.004896 587.613492 447.0 11719.0 I3 node 1 262654 2467.916493 1709.745399 475.0 55497.0 I3 node 2 262654 2188.473997 407.951793 441.0 12753.0 I3 node 3 262654 2180.557516 438.977742 408.0 33344.0 S2 node 0 262654 2817.852891 448.498353 1551.0 22111.0 S2 node 1 262654 2986.501490 669.723599 1730.0 16304.0 S2 node 2 262654 3301.059490 668.908178 2151.0 27917.0 S2 node 3 262654 3260.273279 525.754460 1906.0 64716.0 S3 node 0 262654 4985.791330 2376.884852 2174.0 35329.0 S3 node 1 262654 6209.712566 2318.386712 0.0 34761.0 S3 node 2 262654 4944.184804 1288.595167 2176.0 25891.0 S3 node 3 262654 3835.856878 681.097284 2346.0 25315.0
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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 2020 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -110.75 | +/- 3.73 C |
| Mean Width: | |
| 0.83 | +/- 0.24 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.
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_07_2020.fits 16777216 6.437 6.037 0.000 306.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_07_2020.fits 16777216 0.043 0.327 0.000 25.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_07_2020.fits 16777216 19.070 34.378 0.000 1750.000
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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
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ACIS-1
ACIS-6
HRC-I-1
HRC-S-1
Gyro Bias Drift
Radiation History
Radiation Count Rates of Jul 2020
Sun Spot History (See:NOAA Page)
Trending
Quarterly Trends
- ACIS Temperature
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 1cbat | 0.002 | 0.001 | (2.09+/-0.02)e2 | -0.76 +/- 0.85 | K | CAMERA BODY TEMP. A | |
|---|---|---|---|---|---|---|---|
| 1crat | -0.005 | 0.002 | (1.50+/-0.04)e2 | -0.17 +/- 1.08 | K | COLD RADIATOR TEMP. A | |
| 1crbt | -3.417e-04 | 0.002 | (1.51+/-0.03)e2 | -0.03 +/- 1.09 | K | COLD RADIATOR TEMP. B | |
| 1dactbt | -5.027e-04 | 0.001 | (2.59+/-0.03)e2 | -1.80 +/- 1.17 | K | DA COLLIMATOR TEMP. B | |
| 1deamzt | -0.007 | 0.004 | (2.90+/-0.08)e2 | 0.36 +/- 1.94 | K | DEA -Z PANEL TEMP | |
| 1dpamyt | -0.008 | 0.004 | (2.90+/-0.08)e2 | 2.36 +/- 1.87 | K | DPA -Y PANEL TEMP | |
| 1dpamzt | -0.010 | 0.003 | (2.93+/-0.08)e2 | 1.66 +/- 1.79 | K | DPA -Z PANEL TEMP | |
| 1oahat | 0.002 | 0.001 | (2.46+/-0.02)e2 | -0.88 +/- 0.93 | K | OPEN ACTUATOR HOUSING TEMP. A | |
| 1oahbt | 2.988e-04 | 9.963e-04 | (2.42+/-0.02)e2 | -1.06 +/- 0.85 | K | OPEN ACTUATOR HOUSING TEMP. B | |
| 1pdeaat | -0.024 | 0.003 | (3.04+/-0.07)e2 | 1.07 +/- 2.25 | K | PSMC DEA PS A TEMP | |
| 1pdeabt | -0.025 | 0.003 | (2.96+/-0.07)e2 | 1.26 +/- 2.23 | K | PSMC DEA PS B TEMP | |
| 1wrat | -0.002 | 0.001 | (1.92+/-0.03)e2 | -0.17 +/- 0.82 | K | WARM RADIATOR TEMP. A | |
| 1wrbt | -0.001 | 0.001 | (1.92+/-0.03)e2 | -0.17 +/- 0.82 | K | WARM RADIATOR TEMP. B | |
- ACIS Electronics Side B
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 1dahbcu | 0.000e+00 | 0.000e+00 | (0.00+/-0.00)e0 | (0.00+/-0.00)e0 | AMP | DA HEATER CURRENT B | |
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| 1dahbvo | 0.000e+00 | 0.000e+00 | (0.00+/-0.00)e0 | (0.00+/-0.00)e0 | V | DA HEATER VOLTAGE B | |
| 1dahhbvo | 0.000e+00 | 0.000e+00 | (0.00+/-0.00)e0 | (0.00+/-0.00)e0 | V | DA HOUSING HEATER INPUT | |
| 1de28bvo | 0.004 | 6.915e-05 | 28.16 +/- 0.22 | -0.07 +/- 0.03 | V | DEA +28V INPUT B | |
| 1deicbcu | -7.686e-05 | 8.308e-06 | 16.39 +/- 0.02 | -0.00 +/- 0.01 | AMP | DEA INPUT CURRENT B | |
| 1den0bvo | 1.098e-05 | 7.478e-06 | -0.16 +/- 0.02 | -0.00 +/- 0.00 | V | DEA -6V VOLTAGE B | |
| 1den1bvo | 8.349e-06 | 2.040e-05 | -0.34 +/- 0.05 | -0.01 +/- 0.01 | V | DEA -15V VOLTAGE B | |
| 1dep0bvo | -2.913e-05 | 8.005e-06 | 0.05 +/- 0.02 | 0.00 +/- 0.00 | V | DEA +6V VOLTAGE B | |
| 1dep1bvo | -1.449e-07 | 2.056e-05 | 0.14 +/- 0.05 | 0.01 +/- 0.01 | V | DEA +15V ANALOG B | |
| 1dep2bvo | 2.033e-05 | 3.283e-05 | 0.22 +/- 0.08 | 0.01 +/- 0.02 | V | DEA +24V ANALOG B | |
| 1dep3bvo | 1.447e-05 | 3.932e-05 | 0.27 +/- 0.09 | 0.01 +/- 0.02 | V | DEA +28V ANALOG B | |
| 1dp28bvo | 0.004 | 6.620e-05 | 28.17 +/- 0.21 | -0.07 +/- 0.03 | V | DPA +28V INPUT B | |
| 1dpicbcu | 1.119e-04 | 1.409e-04 | 0.94 +/- 0.32 | -0.07 +/- 0.08 | AMP | DPA INPUT CURRENT B | |
| 1dpp0bvo | -1.323e-05 | 2.085e-05 | 5.22 +/- 0.05 | -0.00 +/- 0.01 | V | DPA +5V ANALOG B | |
- EPHIN Temperature and Voltage
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 5eiot | 0.010 | 0.011 | (3.20+/-0.26)e2 | -2.08 +/- 6.30 | K | EIO TEMP | |
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| 5ephint | 0.008 | 0.003 | (3.29+/-0.07)e2 | -0.66 +/- 2.77 | K | EPHIN TEMP | |
| teio | 0.011 | 0.011 | (3.19+/-0.26)e2 | -3.27 +/- 6.23 | K | EPHIN ELECTRONICS HOUSING TEMP | |
| tephin | 0.008 | 0.003 | (3.29+/-0.08)e2 | -1.54 +/- 2.79 | 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
