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.
)
)
)
Statistics: # IMAGE NPIX MEAN RMS MIN MAX ACIS_jan20 6004901 7.829 10.485 0.0 3060 I2 node 0 262654 5.926989 2.911356 0.0 61.0 I2 node 1 262654 6.257812 3.384963 0.0 677.0 I2 node 2 262654 6.094362 2.913600 0.0 71.0 I2 node 3 262654 6.064832 8.340547 0.0 3060.0 I3 node 0 262654 6.868395 3.225672 0.0 233.0 I3 node 1 262654 6.691865 3.065346 0.0 116.0 I3 node 2 262654 6.677574 3.038186 0.0 71.0 I3 node 3 262654 6.705361 5.437856 0.0 2049.0 S2 node 0 262654 10.348258 5.291031 0.0 1229.0 S2 node 1 262654 10.897226 4.703444 0.0 375.0 S2 node 2 262654 12.013327 8.027903 0.0 2462.0 S2 node 3 262654 13.651476 11.170702 0.0 2981.0 S3 node 0 262654 17.271588 12.193559 0.0 244.0 S3 node 1 262654 17.965033 8.323410 0.0 1040.0 S3 node 2 262654 15.373104 5.201614 0.0 59.0 S3 node 3 262654 13.682003 4.813725 0.0 52.0
)
)
)
Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2363.584 3051.550 0.0 132137 I2 node 0 262654 2048.216151 408.316218 435.0 11890.0 I2 node 1 262654 2154.967738 574.490020 449.0 103164.0 I2 node 2 262654 2183.271805 462.066559 456.0 12134.0 I2 node 3 262654 2188.528411 564.482661 438.0 28649.0 I3 node 0 262654 2330.613375 574.230801 434.0 10213.0 I3 node 1 262654 2411.072457 1705.079141 456.0 55423.0 I3 node 2 262654 2132.424029 397.180358 435.0 12329.0 I3 node 3 262654 2124.662262 427.311679 395.0 32843.0 S2 node 0 262654 2755.968015 437.415710 1532.0 21999.0 S2 node 1 262654 2921.152649 654.694643 1697.0 15974.0 S2 node 2 262654 3230.264805 659.814595 2129.0 27852.0 S2 node 3 262654 3184.409281 520.109806 1880.0 61986.0 S3 node 0 262654 4871.413791 2330.323455 2133.0 34100.0 S3 node 1 262654 6097.586578 2295.675508 0.0 30089.0 S3 node 2 262654 4846.879527 1285.954320 2103.0 25768.0 S3 node 3 262654 3752.034979 679.727154 2306.0 25208.0
)
|
)
|
)
|
)
|
| Oct 2019 | Jul 2019 | Apr 2019 | Jan 2019 |
|---|
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 2020 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -111.07 | +/- 2.63 C |
| Mean Width: | |
| 0.83 | +/- 0.35 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.
)
|
|---|
IMAGE NPIX MEAN STDDEV MIN MAX HRCI_01_2020.fits 16777216 0.075 0.275 0.000 5.000
)
IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_01_2020.fits 16777216 6.143 5.927 0.000 303.000
)
|
|---|
IMAGE NPIX MEAN STDDEV MIN MAX HRCS_01_2020.fits 16777216 0.016 0.130 0.000 4.000
)
IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_01_2020.fits 16777216 18.706 33.884 0.000 1748.000
|
|
Max dose trend plots corrected for events that "pile-up"
in the center of the taps due to bad position information.
|
)
|
)
|
)
|
)
|
| Oct 2019 | Jul 2019 | Apr 2019 | Jan 2019 |
|---|
)
|
)
|
)
|
)
|
| Oct 2019 | Jul 2019 | Apr 2019 | Jan 2019 |
|---|
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 2020
Sun Spot History
Trending
Quarterly Trends
- ACIS Temperature
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 1cbat | 0.004 | 9.814e-04 | (2.10+/-0.02)e2 | -0.68 +/- 0.80 | K | CAMERA BODY TEMP. A |
|---|---|---|---|---|---|---|
| 1crat | 0.003 | 0.001 | (1.51+/-0.03)e2 | -0.12 +/- 1.22 | K | COLD RADIATOR TEMP. A |
| 1crbt | 0.004 | 0.001 | (1.51+/-0.03)e2 | -0.15 +/- 1.22 | K | COLD RADIATOR TEMP. B |
| 1dactbt | 0.011 | 0.001 | (2.59+/-0.03)e2 | -1.71 +/- 1.19 | K | DA COLLIMATOR TEMP. B |
| 1deamzt | 0.005 | 0.004 | (2.91+/-0.09)e2 | 1.44 +/- 2.37 | K | DEA -Z PANEL TEMP |
| 1dpamyt | 0.007 | 0.004 | (2.92+/-0.09)e2 | 1.33 +/- 2.36 | K | DPA -Y PANEL TEMP |
| 1dpamzt | 0.008 | 0.004 | (2.95+/-0.09)e2 | 1.13 +/- 2.33 | K | DPA -Z PANEL TEMP |
| 1oahat | 0.012 | 0.001 | (2.47+/-0.02)e2 | -0.61 +/- 0.85 | K | OPEN ACTUATOR HOUSING TEMP. A |
| 1oahbt | 0.009 | 9.191e-04 | (2.43+/-0.02)e2 | -0.80 +/- 0.76 | K | OPEN ACTUATOR HOUSING TEMP. B |
| 1pdeaat | 0.004 | 0.003 | (3.07+/-0.07)e2 | 1.99 +/- 2.29 | K | PSMC DEA PS A TEMP |
| 1pdeabt | 0.006 | 0.003 | (2.99+/-0.07)e2 | 1.99 +/- 2.23 | K | PSMC DEA PS B TEMP |
| 1pin1at | -0.010 | 0.006 | (3.37+/-0.15)e2 | -3.98 +/- 4.13 | K | PSMC TEMP 1A |
| 1wrat | 0.011 | 0.001 | (1.93+/-0.03)e2 | -0.08 +/- 0.83 | K | WARM RADIATOR TEMP. A |
| 1wrbt | 0.009 | 0.001 | (1.92+/-0.03)e2 | -0.10 +/- 0.81 | 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 |
|---|---|---|---|---|---|---|
| 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 | 5.907e-05 | 27.76 +/- 0.21 | 0.03 +/- 0.02 | V | DEA +28V INPUT B |
| 1deicbcu | 6.346e-07 | 9.749e-06 | 16.40 +/- 0.02 | 0.01 +/- 0.01 | AMP | DEA INPUT CURRENT B |
| 1den0bvo | -1.672e-05 | 5.415e-06 | -0.16 +/- 0.01 | (3.73+/-30.62)e-4 | V | DEA -6V VOLTAGE B |
| 1den1bvo | 2.112e-05 | 1.711e-05 | -0.34 +/- 0.04 | (5.95+/-738.80)e-5 | V | DEA -15V VOLTAGE B |
| 1dep0bvo | -1.605e-05 | 6.977e-06 | 0.05 +/- 0.02 | (3.03+/-27.82)e-4 | V | DEA +6V VOLTAGE B |
| 1dep1bvo | -1.295e-05 | 1.657e-05 | 0.14 +/- 0.04 | -(9.90+/-69.95)e-4 | V | DEA +15V ANALOG B |
| 1dep2bvo | -3.110e-05 | 2.485e-05 | 0.22 +/- 0.06 | -0.00 +/- 0.01 | V | DEA +24V ANALOG B |
| 1dep3bvo | -4.680e-05 | 3.203e-05 | 0.27 +/- 0.07 | -(4.19+/-132.80)e-4 | V | DEA +28V ANALOG B |
| 1dp28bvo | -0.004 | 5.659e-05 | 27.78 +/- 0.21 | 0.02 +/- 0.02 | V | DPA +28V INPUT B |
| 1dpicbcu | -6.450e-04 | 1.123e-04 | 0.94 +/- 0.26 | -(8.30+/-468.30)e-4 | AMP | DPA INPUT CURRENT B |
| 1dpp0bvo | -5.897e-05 | 1.265e-05 | 5.23 +/- 0.03 | -(4.70+/-66.06)e-4 | V | DPA +5V ANALOG B |
- EPHIN Temperature and Voltage
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 5eiot | 0.013 | 0.011 | (3.20+/-0.25)e2 | -2.66 +/- 6.72 | K | EIO TEMP |
|---|---|---|---|---|---|---|
| 5ephint | 0.024 | 0.003 | (3.30+/-0.07)e2 | -0.21 +/- 2.19 | K | EPHIN TEMP |
| teio | 0.015 | 0.011 | (3.19+/-0.25)e2 | -3.76 +/- 6.61 | K | EPHIN ELECTRONICS HOUSING TEMP |
| tephin | 0.025 | 0.003 | (3.30+/-0.07)e2 | -0.34 +/- 2.24 | 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
