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_apr21 6004901 6.898 11.087 0.0 5889 I2 node 0 262654 7.939640 3.493425 0.0 75.0 I2 node 1 262654 8.259404 6.837708 0.0 2917.0 I2 node 2 262654 8.163971 8.705653 0.0 4094.0 I2 node 3 262654 8.444879 27.345202 0.0 5889.0 I3 node 0 262654 8.803614 3.768564 0.0 208.0 I3 node 1 262654 8.574418 3.591024 0.0 132.0 I3 node 2 262654 8.463012 3.455073 0.0 113.0 I3 node 3 262654 8.475106 5.666915 0.0 1438.0 S2 node 0 262654 8.289618 12.038010 0.0 5869.0 S2 node 1 262654 8.372977 3.815477 0.0 217.0 S2 node 2 262654 8.444229 10.811136 0.0 4563.0 S2 node 3 262654 8.362640 3.794058 0.0 482.0 S3 node 0 262654 10.973782 4.773053 0.0 67.0 S3 node 1 262654 12.704455 5.206985 0.0 681.0 S3 node 2 262654 11.989503 4.124197 0.0 55.0 S3 node 3 262654 10.733279 3.803567 0.0 60.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2479.056 3182.501 0.0 137936 I2 node 0 262654 2147.008864 430.264686 459.0 12741.0 I2 node 1 262654 2258.027133 609.458203 471.0 118732.0 I2 node 2 262654 2284.368667 483.013597 487.0 13251.0 I2 node 3 262654 2289.771868 590.866039 462.0 28752.0 I3 node 0 262654 2456.899264 603.853216 456.0 13055.0 I3 node 1 262654 2533.862612 1716.737008 488.0 55590.0 I3 node 2 262654 2252.575222 420.825354 458.0 13295.0 I3 node 3 262654 2245.275356 452.890749 426.0 33968.0 S2 node 0 262654 2893.408395 462.697509 1586.0 22219.0 S2 node 1 262654 3065.674529 688.454537 1762.0 16700.0 S2 node 2 262654 3388.464518 682.772089 2186.0 28647.0 S2 node 3 262654 3354.100551 535.852318 1929.0 68052.0 S3 node 0 262654 5116.118539 2454.842480 2236.0 37166.0 S3 node 1 262654 6345.393172 2327.544436 0.0 37688.0 S3 node 2 262654 5079.046446 1292.931593 2283.0 26234.0 S3 node 3 262654 3952.062819 689.104581 2411.0 25582.0
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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
Apr 2021 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -110.99 | +/- 4.12 C |
| Mean Width: | |
| 0.73 | +/- 0.22 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_04_2021.fits 16777216 0.152 0.440 0.000 14.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_04_2021.fits 16777216 6.944 6.370 0.000 313.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_04_2021.fits 16777216 0.111 0.370 0.000 7.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_04_2021.fits 16777216 19.930 35.362 0.000 1756.000
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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.
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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| 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 Apr 2021
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 | 1.359e-04 | 3.030e-05 | 0.29 +/- 0.07 | -0.00 +/- 0.00 | AMP | BATT 2 CHARGE CURRENT | on | -0.011 | 0.012 | 0.33 +/- 0.33 | (0.00+/-0.00)e0 |
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| eb2di | off | -2.801e-04 | 7.519e-05 | 0.02 +/- 0.18 | (3.39+/-3.39)e-5 | AMP | BATT 2 DISCHARGE CURRENT | on | 0.003 | 0.059 | 0.42 +/- 1.54 | (0.00+/-0.00)e0 |
| eb2v | off | 0.001 | 3.495e-05 | 32.33 +/- 0.09 | (3.75+/-36.83)e-4 | V | BATT 2 VOLTAGE | on | 0.009 | 0.027 | 31.99 +/- 0.71 | (0.00+/-0.00)e0 |
| ecnv1v | -2.631e-06 | 2.839e-06 | 14.89 +/- 0.01 | 0.00 +/- 0.00 | V | CONV 1 +15V OUTPUT | |
| ecnv2v | -4.442e-05 | 4.247e-06 | 14.85 +/- 0.01 | 0.01 +/- 0.00 | V | CONV 2 +15V OUTPUT | |
| ecnv3v | -4.026e-06 | 1.652e-06 | 15.29 +/- 0.00 | (1.68+/-3.46)e-4 | V | CONV 3 +15V OUTPUT | |
- Spacecraft Electronics
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| elbi | -0.003 | 6.656e-04 | 54.05 +/- 1.56 | 0.17 +/- 0.27 | AMP | LOAD BUS CURRENT | |
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| elbv | off | 0.004 | 4.961e-05 | 28.26 +/- 0.19 | 0.00 +/- 0.02 | V | LOAD BUS VOLTAGE | on | -0.014 | 0.006 | 28.81 +/- 0.17 | (0.00+/-0.00)e0 |
- OBA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| oobthr04 | -0.010 | 4.883e-04 | (3.01+/-0.01)e2 | 0.14 +/- 0.42 | K | RT 27: HRMA STRUT | |
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| oobthr12 | -0.015 | 8.238e-04 | (3.00+/-0.02)e2 | -0.70 +/- 0.66 | K | RT 35: OBA CONE | |
| oobthr26 | -0.023 | 0.001 | (3.04+/-0.04)e2 | -1.41 +/- 0.99 | K | RT 48: OBA CONE | |
| oobthr38 | -4.008e-05 | 9.753e-06 | (2.83+/-0.00)e2 | -0.00 +/- 0.00 | K | RT 60: TFTE CONE | |
| oobthr44 | -0.012 | 8.284e-04 | (3.02+/-0.02)e2 | 0.51 +/- 0.70 | K | RT 66: TFTE COVER | |
| oobthr50 | -0.012 | 6.081e-04 | (2.97+/-0.01)e2 | 0.18 +/- 0.55 | 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
