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_nov18 6004901 6.215 8.698 0.0 2509 I2 node 0 262654 6.803422 3.196357 0.0 49.0 I2 node 1 262654 7.120570 3.750678 0.0 856.0 I2 node 2 262654 7.061858 3.203865 0.0 73.0 I2 node 3 262654 6.992960 6.709651 0.0 2509.0 I3 node 0 262654 7.985975 3.680181 0.0 57.0 I3 node 1 262654 7.712784 4.004612 0.0 116.0 I3 node 2 262654 7.260464 3.206708 0.0 71.0 I3 node 3 262654 7.436881 5.970492 0.0 2503.0 S2 node 0 262654 7.649000 5.940862 0.0 2503.0 S2 node 1 262654 7.651031 3.548661 0.0 64.0 S2 node 2 262654 7.777282 6.280798 0.0 1491.0 S2 node 3 262654 7.716178 4.683472 0.0 1016.0 S3 node 0 262654 9.608552 5.536498 0.0 151.0 S3 node 1 262654 10.926793 4.607152 0.0 118.0 S3 node 2 262654 10.358330 3.702681 0.0 119.0 S3 node 3 262654 9.356411 3.461909 0.0 29.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2250.583 2912.618 0.0 126353 I2 node 0 262654 1945.634945 385.510944 415.0 11061.0 I2 node 1 262654 2047.397194 537.603690 429.0 84911.0 I2 node 2 262654 2078.135335 440.387230 429.0 10974.0 I2 node 3 262654 2083.501782 538.460566 417.0 28515.0 I3 node 0 262654 2206.560700 545.928411 411.0 8758.0 I3 node 1 262654 2288.034174 1677.353354 433.0 55076.0 I3 node 2 262654 2015.188422 373.641482 410.0 11406.0 I3 node 3 262654 2006.042969 401.815078 363.0 31573.0 S2 node 0 262654 2616.900214 409.687593 1480.0 21809.0 S2 node 1 262654 2775.050051 619.152867 1625.0 15279.0 S2 node 2 262654 3069.392919 628.761312 2072.0 27718.0 S2 node 3 262654 3019.305168 480.304808 1828.0 55976.0 S3 node 0 262654 4642.051666 2093.205279 2043.0 27085.0 S3 node 1 262654 5866.331400 2236.589527 0.0 28943.0 S3 node 2 262654 4629.391498 1231.514304 1977.0 25047.0 S3 node 3 262654 3573.614274 650.066043 2191.0 24612.0
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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 2018 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -113.23 | +/- 2.81 C |
| Mean Width: | |
| 0.78 | +/- 0.43 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_2018.fits 16777216 0.023 0.152 0.000 3.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_11_2018.fits 16777216 5.586 5.702 0.000 302.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_11_2018.fits 16777216 0.169 0.507 0.000 24.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_11_2018.fits 16777216 17.945 32.735 0.000 1730.000
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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
Gyro Bias Drift
Radiation History
Radiation Count Rates of Nov 2018
Sun Spot History
Trending
Quarterly Trends
- HRMA Heater
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| ohrthr03 | 295.244 | 0.064 | (4.94+/-0.36)e-5 | -0.019+/-0.003 | K | RT 5: HRMA FORWARD APERTURE PLATE |
|---|---|---|---|---|---|---|
| ohrthr09 | 294.969 | 0.398 | 0.002+/-0.000 | -0.111+/-0.019 | K | RT 105: HRMA CAP |
| ohrthr17 | 294.853 | 0.443 | 0.002+/-0.000 | -0.117+/-0.020 | K | RT 125: HSA OUTER CYNLINDER |
| ohrthr24 | 295.319 | 0.697 | 0.004+/-0.000 | -0.205+/-0.032 | K | RT 12: HRMA AFT HEATER PLATE |
| ohrthr38 | 297.179 | 1.699 | 0.006+/-0.000 | -0.383+/-0.065 | K | RT 120: HRMA AFT COLLIMATOR OUTER CYLINDER |
| ohrthr52 | 294.839 | 0.414 | 0.002+/-0.000 | -0.115+/-0.019 | K | RT 100: HRMA CAP |
- HRMA Thermal
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 4rt568t | 296.152 | 1.679 | 0.006+/-0.000 | -0.229+/-0.068 | K | RT 568 - HRMA AHS INNER CYLINDER |
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| 4rt569t | 295.213 | 0.618 | 0.003+/-0.000 | -0.212+/-0.033 | K | RT 569 - PERISCOPE (FIRST FOLD END) |
| 4rt570t | 294.903 | 0.388 | 0.002+/-0.000 | -0.160+/-0.022 | K | RT 570 - HRMA RRCA |
| 4rt575t | 300.209 | 2.024 | 0.006+/-0.000 | -0.255+/-0.076 | K | RT 575 - OB FWD CONE TEMP |
| 4rt576t | 292.093 | 1.676 | 0.006+/-0.000 | -0.228+/-0.069 | K | RT 576 - OB FWD CONE TEMP |
| 4rt578t | 298.497 | 2.738 | 0.004+/-0.000 | -0.120+/-0.090 | K | RT 578 - OB MID CONE TEMP |
- MUPS
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| pm1thv1t | 346.696 | 8.575 | -0.002+/-0.001 | 0.665+/-0.149 | K | MUPS 1 THRUSTER VALVE 01 TEMP |
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| pline02t | 327.733 | 9.484 | -0.009+/-0.001 | 1.418+/-0.210 | K | PROP LINE TEMP 02 |
| pline03t | 323.246 | 12.283 | -0.010+/-0.001 | 1.911+/-0.249 | K | PROP LINE TEMP 03 |
| pline04t | 308.494 | 10.792 | -0.012+/-0.001 | 1.493+/-0.267 | 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
