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_nov20 6004901 7.947 10.909 0.0 1010 I2 node 0 262654 4.290538 2.426819 0.0 28.0 I2 node 1 262654 4.419629 2.640809 0.0 462.0 I2 node 2 262654 4.291528 2.372684 0.0 41.0 I2 node 3 262654 4.253056 2.479239 0.0 140.0 I3 node 0 262654 7.010239 3.247717 0.0 96.0 I3 node 1 262654 6.801335 3.688425 0.0 1010.0 I3 node 2 262654 6.580619 3.013179 0.0 78.0 I3 node 3 262654 6.739023 3.132194 0.0 113.0 S2 node 0 262654 9.881426 3.998121 0.0 134.0 S2 node 1 262654 10.543277 4.837434 0.0 310.0 S2 node 2 262654 12.016686 7.938049 0.0 363.0 S2 node 3 262654 13.411546 13.280538 0.0 586.0 S3 node 0 262654 18.982809 15.383477 1.0 259.0 S3 node 1 262654 19.934991 9.895324 0.0 148.0 S3 node 2 262654 20.155450 9.155465 2.0 133.0 S3 node 3 262654 16.914461 5.522346 0.0 74.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2444.407 3142.455 0.0 136129 I2 node 0 262654 2113.751854 422.787172 448.0 12425.0 I2 node 1 262654 2223.053494 596.896405 464.0 112694.0 I2 node 2 262654 2250.149599 475.706934 477.0 12850.0 I2 node 3 262654 2255.526263 581.837422 452.0 28721.0 I3 node 0 262654 2416.539748 594.263448 449.0 12216.0 I3 node 1 262654 2494.755282 1713.326332 482.0 55542.0 I3 node 2 262654 2214.735750 413.336213 450.0 12962.0 I3 node 3 262654 2207.211067 444.834950 414.0 33632.0 S2 node 0 262654 2851.738768 454.668515 1568.0 22157.0 S2 node 1 262654 3022.988698 678.337863 1743.0 16481.0 S2 node 2 262654 3343.712699 674.188252 2164.0 28041.0 S2 node 3 262654 3308.402265 527.011749 1914.0 66247.0 S3 node 0 262654 5050.104844 2408.997555 2205.0 35747.0 S3 node 1 262654 6275.374463 2321.188188 0.0 35733.0 S3 node 2 262654 5010.943513 1286.475394 2225.0 26056.0 S3 node 3 262654 3891.375331 684.710481 2378.0 25446.0
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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
Nov 2020 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -111.84 | +/- 2.71 C |
| Mean Width: | |
| 0.74 | +/- 0.25 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_11_2020.fits 16777216 0.069 0.273 0.000 18.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_11_2020.fits 16777216 6.678 6.156 0.000 310.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_11_2020.fits 16777216 0.034 0.248 0.000 20.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_11_2020.fits 16777216 19.124 34.518 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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Gyro Bias Drift
Radiation History
Radiation Count Rates of Nov 2020
Sun Spot History (See:NOAA Page)
Trending
Quarterly Trends
- HRMA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| ohrthr03 | -7.054e-05 | 5.285e-06 | (2.95+/-0.00)e2 | -0.01 +/- 0.00 | K | RT 5: HRMA FORWARD APERTURE PLATE | |
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| ohrthr09 | -0.002 | 1.452e-04 | (2.95+/-0.00)e2 | -0.01 +/- 0.04 | K | RT 105: HRMA CAP | |
| ohrthr17 | -0.002 | 1.651e-04 | (2.95+/-0.00)e2 | -0.03 +/- 0.04 | K | RT 125: HSA OUTER CYNLINDER | |
| ohrthr24 | -0.003 | 2.721e-04 | (2.96+/-0.01)e2 | -0.29 +/- 0.12 | K | RT 12: HRMA AFT HEATER PLATE | |
| ohrthr38 | -0.003 | 8.290e-04 | (2.99+/-0.02)e2 | -0.15 +/- 0.47 | K | RT 120: HRMA AFT COLLIMATOR OUTER CYLINDER | |
| ohrthr52 | -0.002 | 1.505e-04 | (2.95+/-0.00)e2 | -0.02 +/- 0.04 | K | RT 100: HRMA CAP | |
- HRMA Thermal
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 4rt568t | -0.004 | 8.457e-04 | (2.98+/-0.02)e2 | 0.04 +/- 0.50 | K | RT 568 - HRMA TEMP | |
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| 4rt569t | -0.002 | 2.247e-04 | (2.96+/-0.01)e2 | -0.15 +/- 0.10 | K | RT 569 - HRMA TEMP | |
| 4rt570t | -0.001 | 1.182e-04 | (2.95+/-0.00)e2 | -0.05 +/- 0.04 | K | RT 570 - HRMA TEMP | |
| 4rt575t | -0.003 | 0.001 | (3.02+/-0.02)e2 | -0.30 +/- 0.68 | K | RT 575 - OB CONE TEMP | |
| 4rt576t | -0.005 | 7.744e-04 | (2.94+/-0.02)e2 | 0.01 +/- 0.47 | K | RT 576 - OB CONE TEMP | |
| 4rt578t | -0.003 | 0.001 | (3.01+/-0.03)e2 | 0.64 +/- 0.80 | K | RT 578 - OB CONE TEMP | |
- MUPS
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| pm1thv1t | 0.004 | 0.007 | (3.48+/-0.15)e2 | -0.05 +/- 3.66 | K | MUPS 1 THRUSTER VALVE 01 TEMP | |
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| pline02t | 0.005 | 0.006 | (3.29+/-0.14)e2 | 5.65 +/- 3.40 | K | PROP LINE TEMP 02 | |
| pline03t | 0.012 | 0.007 | (3.24+/-0.17)e2 | 6.93 +/- 3.28 | K | PROP LINE TEMP 03 | |
| pline04t | 0.013 | 0.006 | (3.11+/-0.13)e2 | 6.06 +/- 3.13 | 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
