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_may21 6004901 11.159 133.275 0.0 18803 I2 node 0 262654 4.985277 2.658022 0.0 44.0 I2 node 1 262654 5.218091 3.511191 0.0 1091.0 I2 node 2 262654 5.573802 3.154290 0.0 60.0 I2 node 3 262654 5.755882 3.314342 0.0 283.0 I3 node 0 262654 8.326736 3.867089 0.0 127.0 I3 node 1 262654 8.452663 25.863582 0.0 10271.0 I3 node 2 262654 6.108929 2.904227 0.0 69.0 I3 node 3 262654 6.079791 2.919332 0.0 115.0 S2 node 0 262654 10.783421 23.365660 0.0 623.0 S2 node 1 262654 12.868900 35.430122 0.0 816.0 S2 node 2 262654 17.156606 57.457180 0.0 2555.0 S2 node 3 262654 14.360261 43.437830 0.0 6487.0 S3 node 0 262654 58.977049 611.570217 0.0 18803.0 S3 node 1 262654 19.018390 47.046077 0.0 2087.0 S3 node 2 262654 24.413572 74.847645 0.0 1241.0 S3 node 3 262654 26.794798 93.768033 0.0 1166.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2490.216 3208.363 0.0 138173 I2 node 0 262654 2151.994141 431.424937 459.0 12785.0 I2 node 1 262654 2263.245224 611.506368 472.0 119823.0 I2 node 2 262654 2289.942469 484.583409 489.0 13298.0 I2 node 3 262654 2295.527751 592.775511 465.0 28758.0 I3 node 0 262654 2465.226000 606.150179 456.0 13182.0 I3 node 1 262654 2542.315275 1718.581245 488.0 55607.0 I3 node 2 262654 2258.684151 422.103968 458.0 13358.0 I3 node 3 262654 2251.355148 454.209536 426.0 34036.0 S2 node 0 262654 2904.191816 468.545579 1586.0 22226.0 S2 node 1 262654 3078.543429 695.810690 1765.0 16726.0 S2 node 2 262654 3405.621124 697.815015 2187.0 28704.0 S2 node 3 262654 3368.460812 552.540296 1929.0 68276.0 S3 node 0 262654 5175.095588 2828.879024 2239.0 51668.0 S3 node 1 262654 6364.411562 2340.545038 0.0 37918.0 S3 node 2 262654 5103.460018 1322.089196 2290.0 26793.0 S3 node 3 262654 3978.857617 728.782866 2414.0 26078.0
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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
May 2021 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -110.26 | +/- 5.47 C |
| Mean Width: | |
| 0.75 | +/- 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 Histogram Mode Trends
We collected data from acis histogram mode data, and created trend plots of peak portions and peak widths against time (DOM). The peaks were estimated by fitting a simple Gaussian on three peaks (Al, Ti, and Mn), and the widths were estimated by a width at the half max from the peak.
All histogram data are taken under TIMED and GRADED_HIST mode, SIM position is at an external calibration source position, the focal temperature is around -119.7 C, and parameter settings in aciselec, acistemp are set to about same for all.
CCD 3, Peak Position
CCD 3, Peak Widths
CCD 3, Count Rates
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_05_2021.fits 16777216 0.079 0.285 0.000 9.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_05_2021.fits 16777216 7.024 6.409 0.000 313.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_05_2021.fits 16777216 0.111 0.369 0.000 7.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_05_2021.fits 16777216 20.041 35.479 0.000 1759.000
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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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Gyro Bias Drift
Radiation History
Radiation Count Rates of May 2021
Sun Spot History (See:NOAA Page)
Trending
Quarterly Trends
- HRMA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| ohrthr03 | -1.732e-04 | 8.182e-06 | (2.95+/-0.00)e2 | -(9.34+/-35.28)e-4 | K | RT 5: HRMA FORWARD APERTURE PLATE | |
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| ohrthr09 | -0.004 | 9.033e-05 | (2.96+/-0.00)e2 | 0.07 +/- 0.05 | K | RT 105: HRMA CAP | |
| ohrthr17 | -0.005 | 9.691e-05 | (2.96+/-0.00)e2 | 0.08 +/- 0.05 | K | RT 125: HSA OUTER CYNLINDER | |
| ohrthr24 | -0.008 | 2.018e-04 | (2.97+/-0.01)e2 | 0.13 +/- 0.14 | K | RT 12: HRMA AFT HEATER PLATE | |
| ohrthr38 | -0.014 | 6.484e-04 | (3.00+/-0.02)e2 | 0.15 +/- 0.53 | K | RT 120: HRMA AFT COLLIMATOR OUTER CYLINDER | |
| ohrthr52 | -0.004 | 9.411e-05 | (2.96+/-0.00)e2 | 0.08 +/- 0.05 | K | RT 100: HRMA CAP | |
- HRMA Thermal
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 4rt568t | -0.016 | 6.963e-04 | (2.99+/-0.02)e2 | 0.12 +/- 0.57 | K | RT 568 - HRMA TEMP | |
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| 4rt569t | -0.007 | 1.774e-04 | (2.96+/-0.00)e2 | 0.09 +/- 0.12 | K | RT 569 - HRMA TEMP | |
| 4rt570t | -0.004 | 8.841e-05 | (2.96+/-0.00)e2 | 0.02 +/- 0.05 | K | RT 570 - HRMA TEMP | |
| 4rt575t | -0.015 | 9.231e-04 | (3.04+/-0.02)e2 | 0.31 +/- 0.76 | K | RT 575 - OB CONE TEMP | |
| 4rt576t | -0.015 | 6.658e-04 | (2.95+/-0.02)e2 | -0.14 +/- 0.54 | K | RT 576 - OB CONE TEMP | |
| 4rt578t | -0.030 | 0.001 | (3.02+/-0.03)e2 | -0.92 +/- 0.92 | K | RT 578 - OB CONE TEMP | |
- MUPS
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| pm1thv1t | 0.035 | 0.007 | (3.51+/-0.17)e2 | -4.32 +/- 3.52 | K | MUPS 1 THRUSTER VALVE 01 TEMP | |
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| pline02t | 0.021 | 0.006 | (3.33+/-0.13)e2 | -4.28 +/- 3.25 | K | PROP LINE TEMP 02 | |
| pline03t | 0.018 | 0.006 | (3.28+/-0.15)e2 | -5.33 +/- 2.90 | K | PROP LINE TEMP 03 | |
| pline04t | 0.012 | 0.005 | (3.16+/-0.11)e2 | -4.68 +/- 2.86 | K | PROP LINE TEMP 04 | |
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
