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_jan21 6004901 8.163 10.687 0.0 3623 I2 node 0 262654 8.149156 3.581114 0.0 74.0 I2 node 1 262654 8.611371 5.654185 0.0 1517.0 I2 node 2 262654 8.417900 3.620270 0.0 91.0 I2 node 3 262654 8.319328 5.610799 0.0 1852.0 I3 node 0 262654 10.137157 4.292634 0.0 229.0 I3 node 1 262654 10.133695 5.908356 0.0 2107.0 I3 node 2 262654 9.402751 3.802909 0.0 135.0 I3 node 3 262654 9.335544 7.217293 0.0 3128.0 S2 node 0 262654 9.589675 3.938057 0.0 151.0 S2 node 1 262654 9.673039 4.250949 0.0 352.0 S2 node 2 262654 9.765104 8.239349 0.0 2597.0 S2 node 3 262654 9.744157 10.884242 0.0 3623.0 S3 node 0 262654 13.867034 4.511833 0.0 67.0 S3 node 1 262654 16.300786 5.710381 0.0 272.0 S3 node 2 262654 15.885191 4.717776 1.0 84.0 S3 node 3 262654 14.262302 4.401792 1.0 53.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2461.032 3162.311 0.0 137051 I2 node 0 262654 2127.765277 425.983424 455.0 12561.0 I2 node 1 262654 2237.913339 602.287244 467.0 115179.0 I2 node 2 262654 2264.602984 478.886924 480.0 13031.0 I2 node 3 262654 2269.759078 585.535203 456.0 28737.0 I3 node 0 262654 2434.187125 598.745829 449.0 12578.0 I3 node 1 262654 2512.067610 1714.969744 486.0 55564.0 I3 node 2 262654 2231.078231 416.797879 452.0 13095.0 I3 node 3 262654 2223.587336 448.480855 420.0 33783.0 S2 node 0 262654 2872.628282 458.898983 1575.0 22188.0 S2 node 1 262654 3044.609582 683.846274 1754.0 16602.0 S2 node 2 262654 3366.811114 679.727022 2178.0 28351.0 S2 node 3 262654 3332.073299 534.195849 1923.0 67189.0 S3 node 0 262654 5084.659827 2451.168394 2224.0 37063.0 S3 node 1 262654 6310.032847 2324.631040 0.0 36440.0 S3 node 2 262654 5045.552711 1291.635370 2254.0 26172.0 S3 node 3 262654 3922.171580 688.420789 2388.0 25535.0
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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 2021 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -112.39 | +/- 2.21 C |
| Mean Width: | |
| 0.68 | +/- 0.22 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_2021.fits 16777216 0.026 0.162 0.000 4.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_01_2021.fits 16777216 6.743 6.179 0.000 311.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_01_2021.fits 16777216 0.108 0.366 0.000 8.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_01_2021.fits 16777216 19.307 34.684 0.000 1751.000
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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 Jan 2021
Sun Spot History (See:NOAA Page)
Trending
Quarterly Trends
- ACIS Temperature
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 1cbat | 0.008 | 9.114e-04 | (2.10+/-0.02)e2 | 1.25 +/- 0.65 | K | CAMERA BODY TEMP. A | |
|---|---|---|---|---|---|---|---|
| 1crat | 0.004 | 0.001 | (1.50+/-0.03)e2 | 0.55 +/- 0.76 | K | COLD RADIATOR TEMP. A | |
| 1crbt | 0.004 | 0.001 | (1.51+/-0.03)e2 | 0.59 +/- 0.75 | K | COLD RADIATOR TEMP. B | |
| 1dactbt | 0.004 | 0.001 | (2.59+/-0.03)e2 | 1.67 +/- 1.27 | K | DA COLLIMATOR TEMP. B | |
| 1deamzt | 0.005 | 0.003 | (2.90+/-0.07)e2 | 1.57 +/- 1.46 | K | DEA -Z PANEL TEMP | |
| 1dpamyt | 0.009 | 0.003 | (2.90+/-0.08)e2 | 0.87 +/- 1.56 | K | DPA -Y PANEL TEMP | |
| 1dpamzt | 0.008 | 0.003 | (2.93+/-0.07)e2 | 0.35 +/- 1.51 | K | DPA -Z PANEL TEMP | |
| 1oahat | 0.006 | 0.001 | (2.47+/-0.02)e2 | 1.20 +/- 0.92 | K | OPEN ACTUATOR HOUSING TEMP. A | |
| 1oahbt | 0.006 | 9.684e-04 | (2.43+/-0.02)e2 | 0.76 +/- 0.86 | K | OPEN ACTUATOR HOUSING TEMP. B | |
| 1pdeaat | 0.017 | 0.003 | (3.04+/-0.07)e2 | 1.18 +/- 2.22 | K | PSMC DEA PS A TEMP | |
| 1pdeabt | 0.016 | 0.003 | (2.96+/-0.07)e2 | 1.50 +/- 2.16 | K | PSMC DEA PS B TEMP | |
| 1wrat | 0.003 | 8.376e-04 | (1.93+/-0.02)e2 | 0.81 +/- 0.57 | K | WARM RADIATOR TEMP. A | |
| 1wrbt | 0.005 | 8.544e-04 | (1.92+/-0.02)e2 | 0.80 +/- 0.57 | 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 | 7.235e-05 | 27.79 +/- 0.23 | 0.02 +/- 0.03 | V | DEA +28V INPUT B | |
| 1deicbcu | 3.829e-05 | 8.796e-06 | 16.39 +/- 0.02 | 0.01 +/- 0.01 | AMP | DEA INPUT CURRENT B | |
| 1den0bvo | -2.706e-05 | 9.120e-06 | -0.15 +/- 0.02 | -0.00 +/- 0.01 | V | DEA -6V VOLTAGE B | |
| 1den1bvo | -7.439e-05 | 2.390e-05 | -0.33 +/- 0.05 | -0.00 +/- 0.01 | V | DEA -15V VOLTAGE B | |
| 1dep0bvo | 3.447e-05 | 9.857e-06 | 0.05 +/- 0.02 | 0.00 +/- 0.01 | V | DEA +6V VOLTAGE B | |
| 1dep1bvo | 6.400e-05 | 2.397e-05 | 0.13 +/- 0.05 | (5.34+/-122.70)e-4 | V | DEA +15V ANALOG B | |
| 1dep2bvo | 1.076e-04 | 3.824e-05 | 0.20 +/- 0.09 | 0.00 +/- 0.02 | V | DEA +24V ANALOG B | |
| 1dep3bvo | 1.335e-04 | 4.642e-05 | 0.25 +/- 0.11 | 0.00 +/- 0.02 | V | DEA +28V ANALOG B | |
| 1dp28bvo | -0.004 | 6.866e-05 | 27.80 +/- 0.22 | 0.02 +/- 0.03 | V | DPA +28V INPUT B | |
| 1dpicbcu | 2.172e-04 | 1.686e-04 | 0.85 +/- 0.38 | -0.03 +/- 0.08 | AMP | DPA INPUT CURRENT B | |
| 1dpp0bvo | 8.309e-05 | 2.383e-05 | 5.21 +/- 0.06 | -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 | 0.033 | 0.011 | (3.25+/-0.25)e2 | -2.97 +/- 4.62 | K | EIO TEMP | |
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| 5ephint | 0.038 | 0.003 | (3.33+/-0.08)e2 | -3.16 +/- 2.65 | K | EPHIN TEMP | |
| teio | 0.031 | 0.011 | (3.24+/-0.24)e2 | -2.57 +/- 4.41 | K | EPHIN ELECTRONICS HOUSING TEMP | |
| tephin | 0.036 | 0.003 | (3.33+/-0.08)e2 | -2.61 +/- 2.64 | 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
