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_jun21 6004901 9.002 21.925 0.0 2638 I2 node 0 262654 6.956416 3.256462 0.0 54.0 I2 node 1 262654 7.252699 4.956088 0.0 1707.0 I2 node 2 262654 7.005481 3.324971 0.0 61.0 I2 node 3 262654 7.127687 3.651388 0.0 537.0 I3 node 0 262654 8.071172 3.649541 0.0 148.0 I3 node 1 262654 8.335456 4.066594 0.0 131.0 I3 node 2 262654 8.104934 3.472512 0.0 69.0 I3 node 3 262654 7.785328 3.454575 0.0 116.0 S2 node 0 262654 9.668011 11.231427 0.0 2609.0 S2 node 1 262654 11.184314 16.837652 0.0 427.0 S2 node 2 262654 15.400988 30.753838 0.0 674.0 S2 node 3 262654 14.966460 20.908290 0.0 575.0 S3 node 0 262654 20.545110 61.918954 0.0 2638.0 S3 node 1 262654 18.225961 17.226253 0.0 421.0 S3 node 2 262654 19.174311 29.020313 0.0 575.0 S3 node 3 262654 18.742359 38.062414 0.0 658.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2499.218 3219.182 0.0 138470 I2 node 0 262654 2158.950556 432.951983 461.0 12839.0 I2 node 1 262654 2270.497923 614.344113 474.0 121530.0 I2 node 2 262654 2296.947950 485.972691 491.0 13359.0 I2 node 3 262654 2302.655438 594.650103 467.0 28765.0 I3 node 0 262654 2473.297173 608.119409 457.0 13285.0 I3 node 1 262654 2550.650731 1720.775937 491.0 55629.0 I3 node 2 262654 2266.789085 423.739915 458.0 13419.0 I3 node 3 262654 2259.140476 455.891952 430.0 34119.0 S2 node 0 262654 2913.859827 471.583312 1590.0 22236.0 S2 node 1 262654 3089.727743 700.694880 1768.0 16768.0 S2 node 2 262654 3421.022112 707.597431 2192.0 28804.0 S2 node 3 262654 3383.427271 562.325858 1933.0 68539.0 S3 node 0 262654 5195.640698 2869.137428 2245.0 52952.0 S3 node 1 262654 6382.637523 2344.018323 0.0 37961.0 S3 node 2 262654 5122.634329 1332.023051 2298.0 27011.0 S3 node 3 262654 3997.599977 747.146325 2421.0 26288.0
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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
Jun 2021 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -109.94 | +/- 5.87 C |
| Mean Width: | |
| 0.69 | +/- 0.17 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_06_2021.fits 16777216 0.006 0.079 0.000 3.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_06_2021.fits 16777216 7.030 6.411 0.000 313.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_06_2021.fits 16777216 0.104 0.410 0.000 22.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_06_2021.fits 16777216 20.145 35.677 0.000 1761.000
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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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Fid Light Drift
Fid light positions on ACA drift with time. The drift trends of Fid light 2 with ACIS-I and ACIS-S configurations are shown below.
The top panel shows Fid light 2 drift in ACENT I (app. along with -Y axis), and the
bottom panel shows that in ACENT J (app. along with Z axis). The unit is a pixel, and
one pixel is approximately 0.5 arcsec. The slope listed at the top right corner is
the change in a position per year (arcsec/yr). The vertical line on DOM = 1411 (Jun 1, 2003)
indicates a transition date of use of IRU-1 to IRU-2.
See also Tom Aldcroft's updated page:
https://cxc.cfa.harvard.edu/mta/ASPECT/fid_drift
Fid 2 (ACIS-I)
Fid 2 (ACIS-S)
Fid 8 (HRC-I)
Fid 12 (HRC-S)
Gyro Bias Drift
Radiation History
Radiation Count Rates of Jun 2021
Sun Spot History (See:NOAA Page)
Trending
Critical Trends
| ACIS Temperatures - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 1pdeaat | -0.015 | 0.003 | (3.04+/-0.07)e2 | 2.99 +/- 2.00 | K | PSMC DEA PS A TEMP | |
| HRMA Computed Averages - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| obaavg | -0.018 | 9.078e-04 | (2.98+/-0.02)e2 | -1.07 +/- 0.64 | TEMP | OBA/TFTE | |
| EPHIN Temperatures - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| teio | 0.003 | 0.010 | (3.25+/-0.24)e2 | -8.45 +/- 4.53 | K | EPHIN ELECTRONICS HOUSING TEMP | |
| tephin | 4.500e-04 | 0.004 | (3.33+/-0.08)e2 | -4.60 +/- 2.75 | K | EPHIN SENSOR HOUSING TEMP | |
| S/C Main Temperatures - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| tcylfmzm | -0.017 | 0.006 | (3.14+/-0.15)e2 | -6.49 +/- 3.27 | K | CNT CYL TEMP:-Z SIDE UNDER LAE-1 | |
| tcylfmzp | -0.011 | 0.006 | (3.17+/-0.13)e2 | -5.22 +/- 2.96 | K | CNT CYL TEMP:-Z SIDE UNDER LAE-2 | |
| S/C Ancillary Temperatures - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| tfssbkt1 | 0.014 | 0.012 | (3.45+/-0.29)e2 | 1.32 +/- 4.91 | K | FSS BRAC | |
| tfssbkt2 | 0.004 | 0.014 | (3.41+/-0.32)e2 | -0.15 +/- 5.24 | K | FSS BRAC | |
| tsctsf1 | 0.005 | 0.002 | (3.18+/-0.05)e2 | -2.71 +/- 1.62 | K | SC-TS FITTING -1 TEMP | |
| tsctsf6 | 0.001 | 0.002 | (3.18+/-0.05)e2 | -2.54 +/- 1.66 | K | SC-TS FITTING -6 TEMP | |
| MUPS - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| pm1thv1t | 0.038 | 0.007 | (3.50+/-0.17)e2 | -4.59 +/- 3.15 | K | MUPS 1 THRUSTER VALVE 01 TEMP | |
| pm2thv1t | 0.052 | 0.020 | (3.22+/-0.47)e2 | -5.48 +/- 8.91 | K | MUPS 2 THRUSTER VALVE 01 TEMP | |
| pm1thv2t | 0.040 | 0.007 | (3.52+/-0.16)e2 | -3.96 +/- 3.21 | K | MUPS 1 THRUSTER VALVE 02 TEMP | |
| pm2thv2t | 0.151 | 0.024 | (3.11+/-0.57)e2 | -8.80 +/- 9.92 | K | MUPS 2 THRUSTER VALVE 02 TEMP | |
| pline02t | 0.026 | 0.006 | (3.32+/-0.13)e2 | -4.71 +/- 2.94 | K | PROP LINE TEMP 02 | |
| pline03t | 0.021 | 0.006 | (3.28+/-0.15)e2 | -4.13 +/- 2.82 | K | PROP LINE TEMP 03 | |
| pline04t | 0.023 | 0.005 | (3.15+/-0.11)e2 | -3.48 +/- 2.72 | K | PROP LINE TEMP 04 | |
Quarterly Trends
- HRMA Struts
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 4rt584t | -0.008 | 5.257e-04 | (3.00+/-0.01)e2 | -1.30 +/- 0.38 | K | RT 584 - STRUT TEMP | |
|---|---|---|---|---|---|---|---|
| 4rt585t | -0.008 | 5.297e-04 | (3.01+/-0.01)e2 | -1.45 +/- 0.38 | K | RT 585 - STRUT TEMP | |
| 4rt586t | -0.009 | 4.458e-04 | (2.97+/-0.01)e2 | -1.25 +/- 0.31 | K | RT 586 - STRUT TEMP | |
| 4rt587t | -0.008 | 3.104e-04 | (2.91+/-0.01)e2 | -0.68 +/- 0.21 | K | RT 587 - STRUT TEMP | |
| 4rt597t | -0.007 | 0.001 | (3.07+/-0.03)e2 | -2.05 +/- 0.91 | K | RT 597 - TFTE TEMP | |
| 4rt598t | -0.006 | 0.001 | (3.07+/-0.03)e2 | -2.48 +/- 0.90 | K | RT 598 - TFTE TEMP | |
- OB Forward Bulkhead
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 4rt705t | -0.011 | 6.305e-04 | (2.92+/-0.02)e2 | -1.23 +/- 0.45 | K | RT 705 - OB BUL | |
|---|---|---|---|---|---|---|---|
| 4rt706t | -0.011 | 6.481e-04 | (2.90+/-0.02)e2 | -1.39 +/- 0.46 | K | RT 706 - OB BUL | |
| 4rt707t | -0.012 | 6.545e-04 | (2.93+/-0.02)e2 | -1.24 +/- 0.47 | K | RT 707 - OB BULKHEAD TEMP | |
| 4rt708t | -0.012 | 7.392e-04 | (2.98+/-0.02)e2 | -1.30 +/- 0.53 | K | RT 708 - OB BULKHEAD TEMP | |
| 4rt709t | -0.012 | 7.957e-04 | (2.99+/-0.02)e2 | -1.36 +/- 0.57 | K | RT 709 - OB BULKHEAD TEMP | |
| 4rt710t | -0.011 | 8.582e-04 | (3.01+/-0.02)e2 | -1.34 +/- 0.62 | K | RT 710 - OB BULKHEAD TEMP | |
- HRMA Thermal
- HRMA Thermal
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 4rt568t | -0.014 | 7.290e-04 | (2.98+/-0.02)e2 | -1.67 +/- 0.52 | K | RT 568 - HRMA TEMP | |
|---|---|---|---|---|---|---|---|
| 4rt569t | -0.005 | 1.894e-04 | (2.96+/-0.00)e2 | -0.42 +/- 0.11 | K | RT 569 - HRMA TEMP | |
| 4rt570t | -0.003 | 9.528e-05 | (2.95+/-0.00)e2 | -0.07 +/- 0.04 | K | RT 570 - HRMA TEMP | |
| 4rt575t | -0.012 | 9.484e-04 | (3.03+/-0.02)e2 | -1.84 +/- 0.69 | K | RT 575 - OB CONE TEMP | |
| 4rt576t | -0.013 | 6.930e-04 | (2.94+/-0.02)e2 | -1.63 +/- 0.49 | K | RT 576 - OB CONE TEMP | |
| 4rt578t | -0.030 | 0.001 | (3.01+/-0.03)e2 | -1.62 +/- 0.87 | K | RT 578 - OB CONE TEMP | |
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
