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_may20 6004901 10.805 16.068 0.0 6204 I2 node 0 262654 8.652520 3.690949 0.0 75.0 I2 node 1 262654 8.892690 4.743161 0.0 1417.0 I2 node 2 262654 8.726666 3.682036 0.0 96.0 I2 node 3 262654 8.849183 11.271013 0.0 5389.0 I3 node 0 262654 9.808025 14.743593 0.0 6204.0 I3 node 1 262654 9.075568 3.709627 0.0 135.0 I3 node 2 262654 9.184605 3.660014 0.0 104.0 I3 node 3 262654 9.492623 8.189925 0.0 2494.0 S2 node 0 262654 12.821212 4.900007 0.0 108.0 S2 node 1 262654 14.109143 5.916616 0.0 392.0 S2 node 2 262654 14.723338 9.242805 0.0 2455.0 S2 node 3 262654 14.405593 13.504642 0.0 5948.0 S3 node 0 262654 30.520194 31.327231 0.0 306.0 S3 node 1 262654 27.471467 20.880409 0.0 354.0 S3 node 2 262654 22.565177 10.343581 1.0 118.0 S3 node 3 262654 19.261002 6.399112 1.0 54.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2396.772 3089.638 0.0 133982 I2 node 0 262654 2078.405914 414.884648 440.0 12153.0 I2 node 1 262654 2186.258857 583.784221 453.0 106294.0 I2 node 2 262654 2214.003642 468.233415 467.0 12476.0 I2 node 3 262654 2219.438500 572.302214 445.0 28682.0 I3 node 0 262654 2370.253611 583.240567 446.0 11237.0 I3 node 1 262654 2449.128734 1707.752152 475.0 55468.0 I3 node 2 262654 2170.039970 404.302323 439.0 12639.0 I3 node 3 262654 2162.710872 435.177121 406.0 33192.0 S2 node 0 262654 2797.372901 444.670467 1543.0 22074.0 S2 node 1 262654 2964.763488 664.591174 1719.0 16212.0 S2 node 2 262654 3275.140870 665.613503 2146.0 27886.0 S2 node 3 262654 3228.334868 524.311415 1901.0 63992.0 S3 node 0 262654 4936.106338 2346.388640 2162.0 34485.0 S3 node 1 262654 6164.998409 2308.016366 0.0 33067.0 S3 node 2 262654 4907.517122 1290.154785 2148.0 25853.0 S3 node 3 262654 3805.680855 680.072193 2333.0 25267.0
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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 2020 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -111.04 | +/- 3.69 C |
| Mean Width: | |
| 0.87 | +/- 0.48 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_2020.fits 16777216 0.023 0.154 0.000 9.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_05_2020.fits 16777216 6.425 6.023 0.000 306.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_05_2020.fits 16777216 0.009 0.096 0.000 3.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_05_2020.fits 16777216 19.023 34.213 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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Gyro Bias Drift
Radiation History
Radiation Count Rates of May 2020
Sun Spot History
Trending
Quarterly Trends
- HRMA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| ohrthr03 | 1.641e-04 | 1.116e-05 | (2.95+/-0.00)e2 | 0.01 +/- 0.00 | K | RT 5: HRMA FORWARD APERTURE PLATE | |
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| ohrthr09 | 9.638e-04 | 8.836e-05 | (2.96+/-0.00)e2 | 0.06 +/- 0.03 | K | RT 105: HRMA CAP | |
| ohrthr17 | 0.001 | 9.038e-05 | (2.96+/-0.00)e2 | 0.07 +/- 0.03 | K | RT 125: HSA OUTER CYNLINDER | |
| ohrthr24 | 0.002 | 1.789e-04 | (2.97+/-0.00)e2 | 0.13 +/- 0.10 | K | RT 12: HRMA AFT HEATER PLATE | |
| ohrthr38 | 0.003 | 5.206e-04 | (3.00+/-0.01)e2 | 0.62 +/- 0.37 | K | RT 120: HRMA AFT COLLIMATOR OUTER CYLINDER | |
| ohrthr52 | 9.978e-04 | 9.218e-05 | (2.96+/-0.00)e2 | 0.07 +/- 0.03 | K | RT 100: HRMA CAP | |
- HRMA Thermal
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 4rt568t | 0.003 | 5.542e-04 | (2.99+/-0.01)e2 | 0.47 +/- 0.40 | K | RT 568 - HRMA TEMP | |
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| 4rt569t | 9.734e-04 | 1.494e-04 | (2.97+/-0.00)e2 | 0.11 +/- 0.08 | K | RT 569 - HRMA TEMP | |
| 4rt570t | 9.202e-04 | 8.662e-05 | (2.96+/-0.00)e2 | 0.05 +/- 0.03 | K | RT 570 - HRMA TEMP | |
| 4rt575t | 0.005 | 7.338e-04 | (3.04+/-0.02)e2 | 0.77 +/- 0.52 | K | RT 575 - OB CONE TEMP | |
| 4rt576t | 0.003 | 5.389e-04 | (2.95+/-0.01)e2 | 0.55 +/- 0.38 | K | RT 576 - OB CONE TEMP | |
| 4rt578t | 0.004 | 0.001 | (3.02+/-0.03)e2 | 0.81 +/- 0.73 | K | RT 578 - OB CONE TEMP | |
- MUPS
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| pm1thv1t | -0.006 | 0.006 | (3.50+/-0.15)e2 | 1.69 +/- 3.78 | K | MUPS 1 THRUSTER VALVE 01 TEMP | |
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| pline02t | -0.018 | 0.005 | (3.31+/-0.12)e2 | 1.11 +/- 3.42 | K | PROP LINE TEMP 02 | |
| pline03t | -0.027 | 0.007 | (3.28+/-0.15)e2 | 2.00 +/- 3.63 | K | PROP LINE TEMP 03 | |
| pline04t | -0.021 | 0.005 | (3.13+/-0.11)e2 | 2.53 +/- 3.06 | 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
