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_oct23 6004901 5.829 17.569 0.0 599 I2 node 0 262654 4.313968 2.406136 0.0 54.0 I2 node 1 262654 4.591149 2.727794 0.0 506.0 I2 node 2 262654 4.448248 2.446416 0.0 89.0 I2 node 3 262654 4.477685 2.557444 0.0 260.0 I3 node 0 262654 4.762149 2.599949 0.0 55.0 I3 node 1 262654 4.654102 2.523276 0.0 97.0 I3 node 2 262654 4.489648 2.428489 0.0 47.0 I3 node 3 262654 4.483343 2.456540 0.0 121.0 S2 node 0 262654 7.109957 11.002296 0.0 402.0 S2 node 1 262654 8.930614 18.889566 0.0 326.0 S2 node 2 262654 13.868746 37.941681 0.0 515.0 S2 node 3 262654 9.532095 20.606920 0.0 397.0 S3 node 0 262654 6.330067 4.346907 0.0 94.0 S3 node 1 262654 8.205991 9.759505 0.0 304.0 S3 node 2 262654 12.665652 27.397604 0.0 486.0 S3 node 3 262654 15.039336 38.872290 0.0 518.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2662.503 3386.721 0.0 153424 I2 node 0 262654 2312.107223 468.092827 493.0 14649.0 I2 node 1 262654 2435.945174 676.917112 505.0 151418.0 I2 node 2 262654 2464.301836 522.241154 531.0 15730.0 I2 node 3 262654 2468.882447 638.914738 493.0 32292.0 I3 node 0 262654 2657.567251 654.455646 495.0 14439.0 I3 node 1 262654 2739.728963 1748.781283 517.0 55965.0 I3 node 2 262654 2450.320369 458.407859 489.0 14808.0 I3 node 3 262654 2430.171718 493.197045 459.0 35566.0 S2 node 0 262654 3103.520385 501.002585 1679.0 22517.0 S2 node 1 262654 3294.008403 748.776050 1861.0 17822.0 S2 node 2 262654 3651.632724 752.789596 2270.0 32056.0 S2 node 3 262654 3609.781052 606.732436 2003.0 79189.0 S3 node 0 262654 5501.483425 2984.675285 2414.0 54786.0 S3 node 1 262654 6719.983617 2382.945890 0.0 69061.0 S3 node 2 262654 5454.115047 1359.363629 2526.0 27457.0 S3 node 3 262654 4275.712255 767.605140 2583.0 26607.0
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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
Oct 2023 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_10_2023.fits 16777216 0.030 0.174 0.000 4.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_10_2023.fits 16777216 na na na na
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_10_2023.fits 16777216 0.029 0.179 0.000 8.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_10_2023.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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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.
Gratings Resolving Power
We plot E/dE vs. E for fits to detected lines with fwhm_error/fwhm less than 0.15 for the plus and minus arms of HEG, MEG, and LEG. Also shown are conservative (dotted line) and optimistic (dashed line) pre-launch resolving power expectations.
We have selected only calibration observations of Capella, HR1099, and Sigma Gem. See MIT technotes for a parallel analysis.
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| Metg minus side | Metg plus side |
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| Hetg minus side | Hetg plus side |
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PCAD
ACA Trending
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Gyro Bias Drift
Radiation History
Radiation Count Rates of Oct 2023
Sun Spot History (See:NOAA Page)
SIM
SIM Shift and Twist
SIM Shift and Twist Trend The following plots show trends of SIM shifts (dy and dz) and twist (dtheta). All quantities are directly taken from pcaf*_asol1.fits files. The units are mm for dy and dz, and degree for dtheta. We fit three lines separated before and after (Days of Mission)= 1400 (May 21, 2003), 2700 (Dec 11, 2006), and 4400 (Aug 07, 2011). The unit of slopes are mm per day or degree per day.
The sudden shift around DOM = 1400, 2700 and 4400 are due to fid light drift (see a memo by Aldcroft fiducial light drift). On the dtheta plot, two tracks are clearly observed. The track around 0.01 is due to HRC-I, and all others are clustered around -0.002. For more detail, please see SIM Shift and Twist Trend page
Trending
Quarterly Trends
- EPS Batteries
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| eb2ci | off | -5.618e-04 | 5.916e-05 | 0.31 +/- 0.14 | 0.00 +/- 0.00 | AMP | BATT 2 CHARGE CURRENT | on | -0.002 | 0.003 | 0.38 +/- 0.32 | (0.00+/-0.00)e0 |
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| eb2di | off | -6.918e-04 | 1.283e-04 | 0.03 +/- 0.30 | (2.09+/-6.00)e-5 | AMP | BATT 2 DISCHARGE CURRENT | on | 0.006 | 0.010 | 0.27 +/- 1.03 | (0.00+/-0.00)e0 |
| eb2v | off | 0.001 | 6.602e-05 | 32.28 +/- 0.16 | 0.00 +/- 0.00 | V | BATT 2 VOLTAGE | on | -0.007 | 0.004 | 32.17 +/- 0.46 | (0.00+/-0.00)e0 |
| ecnv1v | -2.077e-05 | 4.755e-06 | 14.89 +/- 0.01 | (6.32+/-6.01)e-4 | V | CONV 1 +15V OUTPUT | |
| ecnv2v | -4.739e-06 | 3.541e-06 | 14.83 +/- 0.01 | 0.00 +/- 0.00 | V | CONV 2 +15V OUTPUT | |
| ecnv3v | -2.715e-05 | 2.294e-06 | 15.28 +/- 0.01 | (1.44+/-3.65)e-4 | V | CONV 3 +15V OUTPUT | |
- Spacecraft Electronics
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| elbi | 0.003 | 5.472e-04 | 53.23 +/- 1.28 | 0.03 +/- 0.16 | AMP | LOAD BUS CURRENT | |
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| elbv | off | 0.002 | 6.899e-05 | 27.82 +/- 0.17 | -0.04 +/- 0.02 | V | LOAD BUS VOLTAGE | on | 0.007 | 0.003 | 27.71 +/- 0.36 | (0.00+/-0.00)e0 |
- OBA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| oobthr04 | 0.006 | 7.138e-04 | (3.03+/-0.02)e2 | 0.81 +/- 0.39 | K | RT 27: HRMA STRUT | |
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| oobthr12 | 0.008 | 0.001 | (3.01+/-0.02)e2 | 0.97 +/- 0.60 | K | RT 35: OBA CONE | |
| oobthr26 | 0.011 | 0.002 | (3.05+/-0.04)e2 | 1.18 +/- 0.91 | K | RT 48: OBA CONE | |
| oobthr38 | 3.574e-05 | 5.182e-06 | (2.72+/-0.00)e2 | 0.00 +/- 0.00 | K | RT 60: TFTE CONE | |
| oobthr44 | 0.008 | 0.001 | (3.04+/-0.02)e2 | 1.02 +/- 0.62 | K | RT 66: TFTE COVER | |
| oobthr50 | 0.008 | 8.899e-04 | (2.98+/-0.02)e2 | 0.90 +/- 0.52 | K | RT 76: S/C STRUT | |
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
