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.
)
)
)
Statistics: # IMAGE NPIX MEAN RMS MIN MAX ACIS_aug25 6004901 3.591 5.155 0.0 390 I2 node 0 262654 4.188589 2.460761 0.0 77.0 I2 node 1 262654 4.905430 3.144256 0.0 89.0 I2 node 2 262654 4.301118 2.508387 0.0 86.0 I2 node 3 262654 4.069677 2.589274 0.0 350.0 I3 node 0 262654 6.855229 11.316086 0.0 115.0 I3 node 1 262654 4.054772 2.362831 0.0 110.0 I3 node 2 262654 4.114058 2.432937 0.0 62.0 I3 node 3 262654 3.924784 2.316088 0.0 104.0 S2 node 0 262654 4.257165 2.376058 0.0 81.0 S2 node 1 262654 4.302918 2.623366 0.0 212.0 S2 node 2 262654 4.494508 2.686183 0.0 224.0 S2 node 3 262654 4.510605 2.886313 0.0 390.0 S3 node 0 262654 6.652371 10.401333 0.0 287.0 S3 node 1 262654 6.276101 3.127577 0.0 44.0 S3 node 2 262654 6.071890 2.845354 0.0 28.0 S3 node 3 262654 5.334318 2.541873 0.0 32.0
)
)
)
Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2743.889 3465.596 0.0 169725 I2 node 0 262654 2382.758596 484.493238 507.0 15942.0 I2 node 1 262654 2513.248175 710.885047 522.0 167719.0 I2 node 2 262654 2539.858932 539.927283 546.0 17654.0 I2 node 3 262654 2544.456446 661.971893 505.0 36734.0 I3 node 0 262654 2749.999134 684.428152 504.0 15485.0 I3 node 1 262654 2828.079314 1758.031289 529.0 56076.0 I3 node 2 262654 2535.650040 476.217221 496.0 15545.0 I3 node 3 262654 2511.772413 513.213032 475.0 36710.0 S2 node 0 262654 3201.632499 518.133361 1724.0 22661.0 S2 node 1 262654 3401.505855 777.673540 1901.0 21400.0 S2 node 2 262654 3773.024514 782.386864 2313.0 33967.0 S2 node 3 262654 3730.373686 640.696361 2038.0 87673.0 S3 node 0 262654 5673.889974 3072.658901 2494.0 55537.0 S3 node 1 262654 6888.644623 2409.317930 0.0 83602.0 S3 node 2 262654 5622.894026 1383.231733 2648.0 27707.0 S3 node 3 262654 4424.169133 784.003864 2657.0 26803.0
)
|
)
|
)
|
)
|
| May 2025 | Feb 2025 | Nov 2024 | Aug 2024 |
|---|
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
Aug 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.
)
|
|---|
IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_2025.fits 16777216 0.060 0.249 0.000 9.000
)
IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_08_2025.fits 16777216 na na na na
No Data
)
IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_08_2025.fits 16777216 na na na na
|
|
Max dose trend plots corrected for events that "pile-up"
in the center of the taps due to bad position information.
|
)
|
)
|
)
|
)
|
| May 2025 | Feb 2025 | Nov 2024 | Aug 2024 |
|---|
)
|
)
|
)
|
)
|
| May 2025 | Feb 2025 | Nov 2024 | Aug 2024 |
|---|
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 | |
|---|---|---|---|---|---|---|---|
| ACIS I |  |
 |
 |
 |
 |
 |
 |
| ACIS S |  |
 |
 |
 |
 |
 |
 |
| HRC I |  |
 |
 |
 |
 |
 |
 |
| HRC S |  |
 |
 |
 |
 |
 |
 |
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
| ACIS |
)
|
)
|
)
|
|
|---|---|---|---|---|
)
|
)
|
)
| ||
| HRCI |
)
|
)
|
)
|
)
|
| HRCI |
)
|
)
|
)
|
)
|
Gyro Bias Drift
Radiation History
Radiation Count Rates of Aug 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 | |
|---|---|---|---|---|---|---|---|
| 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) | |
|---|---|---|---|---|---|---|---|
| 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
