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_feb25 6004901 3.027 3.593 0.0 354 I2 node 0 262654 2.968666 1.933516 0.0 53.0 I2 node 1 262654 3.215008 2.087191 0.0 89.0 I2 node 2 262654 3.330621 2.131679 0.0 101.0 I2 node 3 262654 3.520602 2.434265 0.0 219.0 I3 node 0 262654 5.006112 3.526687 0.0 86.0 I3 node 1 262654 3.961515 2.443668 0.0 136.0 I3 node 2 262654 3.594430 2.161837 0.0 72.0 I3 node 3 262654 3.416620 2.129651 0.0 135.0 S2 node 0 262654 3.658559 2.144689 0.0 88.0 S2 node 1 262654 3.817593 2.414797 0.0 212.0 S2 node 2 262654 3.785340 2.535995 0.0 354.0 S2 node 3 262654 3.685790 2.402827 0.0 353.0 S3 node 0 262654 4.907797 2.418310 0.0 64.0 S3 node 1 262654 5.865002 2.777949 0.0 53.0 S3 node 2 262654 5.560570 2.522744 0.0 31.0 S3 node 3 262654 4.963652 2.375641 0.0 25.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2721.244 3443.350 0.0 168593 I2 node 0 262654 2365.142964 480.211412 507.0 15633.0 I2 node 1 262654 2493.362901 704.784593 516.0 166587.0 I2 node 2 262654 2520.731271 535.019103 543.0 17257.0 I2 node 3 262654 2524.989361 655.929455 502.0 36181.0 I3 node 0 262654 2721.184442 673.182340 503.0 15169.0 I3 node 1 262654 2803.319177 1755.293863 527.0 56054.0 I3 node 2 262654 2511.921349 471.394733 493.0 15347.0 I3 node 3 262654 2488.887862 509.658731 469.0 35967.0 S2 node 0 262654 3174.507081 513.230747 1714.0 22616.0 S2 node 1 262654 3371.971790 769.425825 1890.0 20004.0 S2 node 2 262654 3738.967406 773.669311 2304.0 33500.0 S2 node 3 262654 3695.946516 628.368322 2026.0 85454.0 S3 node 0 262654 5621.089825 3025.395379 2468.0 55159.0 S3 node 1 262654 6841.561706 2400.390316 0.0 83602.0 S3 node 2 262654 5574.973821 1372.730992 2612.0 27631.0 S3 node 3 262654 4384.456906 778.207753 2645.0 26724.0
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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
Feb 2025 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -107.53 | +/- 7.69 C |
| Mean Width: | |
| 0.8 | +/- 0.58 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 |
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_02_2025.fits 16777216 0.030 0.186 0.000 12.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_02_2025.fits 16777216 na na na na
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_02_2025.fits 16777216 0.008 0.092 0.000 3.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_02_2025.fits 16777216 na na na na
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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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HRMA Focus
Plots below show various characteristics of detected imaging sources. Standard level 2 data products (*src2.fits) are used. Only observations with focus (sim_x) within 0.01 mm of nominal value for given SI configuration are used. Sources are also filtered for strength (SNR > 15).
| XY | PSF | Roundness | EE Radius | SNR | Rotation | Rotation2 | |
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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 Feb 2025
Sun Spot History (See:NOAA Page)
Trending
Quarterly Trends
- HRC Temperature
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 2ceahvpt | 0.001 | 5.568e-04 | (2.79+/-0.01)e2 | 0.14 +/- 0.41 | K | CEA RADIATOR TEMPERATURE AT CENTER | |
|---|---|---|---|---|---|---|---|
| 2chtrpzt | 7.657e-04 | 5.485e-04 | (2.76+/-0.01)e2 | 0.15 +/- 0.40 | K | CENTRAL ELECTRONICS BOX TEMP | |
| 2condmxt | 0.001 | 8.217e-04 | (2.70+/-0.02)e2 | -0.87 +/- 0.54 | K | CONDUIT -X FACE TEMPERATURE | |
| 2dcentrt | 7.479e-04 | 2.794e-04 | (2.74+/-0.01)e2 | 0.17 +/- 0.21 | K | DETECTOR HOUSING TEMP 2 | |
| 2dtstatt | 0.003 | 4.523e-04 | (2.70+/-0.01)e2 | 0.07 +/- 0.32 | K | DETECTOR HOUSING TEMP 1 | |
| 2fhtrmzt | 0.006 | 0.001 | (2.65+/-0.03)e2 | -1.01 +/- 0.91 | K | FRONT END ELECTRONICS BOX TEMPERATURE | |
| 2fradpyt | 0.005 | 0.001 | (2.63+/-0.03)e2 | -1.18 +/- 0.88 | K | FRONT END ASSEMBLY +Y AT RADIATOR CENTER TEMP | |
| 2pmt1t | -0.003 | 6.786e-04 | (2.83+/-0.02)e2 | 0.12 +/- 0.42 | K | PMT 1 TEMPERATURE | |
| 2pmt2t | -0.002 | 6.911e-04 | (2.83+/-0.02)e2 | 0.21 +/- 0.43 | K | PMT 2 TEMPERATURE | |
| 2uvlspxt | -6.398e-04 | 4.948e-04 | (2.75+/-0.01)e2 | 0.36 +/- 0.36 | K | UV LIGHT SHIELD NEXT TO SNOUT TEMP | |
- HRC HK
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 2fe00atm | -3.621e-04 | 0.006 | -1.20 +/- 3.15 | 0.56 +/- 0.12 | C | Front end temperature | |
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| 2fepratm | on | 0.075 | 0.004 | 25.19 +/- 1.89 | -2.48 +/- 1.79 | C | FE temp card temperature | off | 3.976e-04 | 0.005 | -1.11 +/- 3.12 | 0.57 +/- 0.11 |
| 2imhvatm | on | 0.046 | 0.003 | 31.71 +/- 1.25 | -1.31 +/- 1.13 | C | Imaging det HVPS temperature | off | 0.008 | 0.003 | 16.31 +/- 1.64 | -0.02 +/- 0.12 |
| 2iminatm | on | 0.064 | 0.003 | 20.52 +/- 1.59 | -1.25 +/- 1.57 | C | Imaging det temperature | off | 0.002 | 0.001 | 1.29 +/- 0.67 | 0.27 +/- 0.06 |
| 2lvplatm | on | 0.036 | 0.003 | 28.00 +/- 1.17 | -1.19 +/- 1.10 | C | LVPS plate temperature | off | -0.003 | 0.003 | 10.20 +/- 1.51 | 0.14 +/- 0.09 |
| 2prbscr | on | 0.001 | 1.075e-04 | 1.76 +/- 0.05 | -0.03 +/- 0.05 | AMP | Primary bus current | off | 7.708e-06 | 2.818e-05 | 1.71 +/- 0.02 | (8.30+/-152.50)e-5 |
| 2prbsvl | 9.826e-04 | 2.024e-04 | 26.76 +/- 0.12 | -0.04 +/- 0.01 | V | Primary bus voltage | |
| 2smtratm | on | 2.481e-13 | 2.768e-09 | 5.94 +/- 0.00 | (2.46+/-13.58)e-13 | C | Selected motor temperature | off | -3.541e-15 | 999.000 | 5.66 +/- 0.00 | (2.67+/-1.54)e-14 |
| 2sphvatm | on | -0.002 | 0.003 | 31.48 +/- 1.19 | -0.02 +/- 1.24 | C | Spect det HVPS temperature | off | -0.018 | 0.003 | 16.55 +/- 1.78 | 0.31 +/- 0.08 |
| 2spinatm | on | 0.054 | 0.003 | 19.08 +/- 1.49 | -1.14 +/- 1.53 | C | Spect det temperature | off | -0.001 | 0.001 | 3.46 +/- 0.78 | 0.09 +/- 0.05 |
- PCAD Temperature
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| aacccdpt | 5.140e-05 | 7.863e-04 | (2.65+/-0.02)e2 | 0.47 +/- 0.47 | K | AC CCD TEMP (PRI) | |
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| aacccdrt | 1.529e-04 | 8.473e-04 | (3.09+/-0.02)e2 | 0.57 +/- 0.51 | K | AC CCD TEMP (RDNT) | |
| aach1t | 2.078e-04 | 8.645e-04 | (3.06+/-0.02)e2 | 0.46 +/- 0.52 | K | AC HOUSING TEMP (ACH1) | |
| aach2t | 2.692e-04 | 8.665e-04 | (3.06+/-0.02)e2 | 0.54 +/- 0.52 | K | AC HOUSING TEMP (ACH2) | |
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
