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_apr19 6004901 8.995 12.926 0.0 5589 I2 node 0 262654 7.307676 3.367884 0.0 63.0 I2 node 1 262654 7.662656 3.906845 0.0 872.0 I2 node 2 262654 7.413302 3.300274 0.0 74.0 I2 node 3 262654 7.587092 8.502548 0.0 3952.0 I3 node 0 262654 13.183545 5.024927 0.0 647.0 I3 node 1 262654 13.348501 10.676352 0.0 4291.0 I3 node 2 262654 12.612194 4.482190 0.0 139.0 I3 node 3 262654 12.409789 7.219233 0.0 2803.0 S2 node 0 262654 12.246722 7.256510 0.0 2343.0 S2 node 1 262654 12.554385 5.155332 0.0 134.0 S2 node 2 262654 12.900647 12.621868 0.0 4286.0 S2 node 3 262654 12.825525 13.729442 0.0 5589.0 S3 node 0 262654 13.512240 4.819078 0.0 104.0 S3 node 1 262654 16.064247 6.658464 0.0 1885.0 S3 node 2 262654 14.929680 4.353680 1.0 89.0 S3 node 3 262654 14.472070 10.986562 0.0 213.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2289.782 2959.110 0.0 128651 I2 node 0 262654 1982.515388 393.779385 424.0 11385.0 I2 node 1 262654 2086.292121 549.951218 433.0 90218.0 I2 node 2 262654 2116.071215 448.207575 436.0 11366.0 I2 node 3 262654 2121.406202 547.835388 427.0 28561.0 I3 node 0 262654 2255.943338 556.941409 417.0 8884.0 I3 node 1 262654 2337.283058 1694.658528 440.0 55304.0 I3 node 2 262654 2061.860210 383.051789 417.0 11714.0 I3 node 3 262654 2052.790052 411.608991 370.0 32089.0 S2 node 0 262654 2668.087178 418.282674 1497.0 21875.0 S2 node 1 262654 2827.942134 630.889831 1656.0 15544.0 S2 node 2 262654 3125.768256 636.249106 2090.0 27770.0 S2 node 3 262654 3076.989927 486.709386 1847.0 58214.0 S3 node 0 262654 4706.352531 2105.506778 2079.0 27293.0 S3 node 1 262654 5937.440075 2244.213835 0.0 29215.0 S3 node 2 262654 4698.336026 1238.558794 2031.0 25153.0 S3 node 3 262654 3634.241589 652.740418 2233.0 24706.0
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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 2019 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -113.03 | +/- 2.78 C |
| Mean Width: | |
| 0.79 | +/- 0.3 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_2019.fits 16777216 0.036 0.200 0.000 13.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_04_2019.fits 16777216 5.731 5.767 0.000 302.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_04_2019.fits 16777216 0.053 0.433 0.000 53.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_04_2019.fits 16777216 18.042 32.810 0.000 1730.000
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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.
| Year 2014 - | |
|---|---|
| Letg minus side | Letg plus side |
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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
Gyro Bias Drift
Radiation History
Radiation Count Rates of Apr 2019
Sun Spot History
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 | 0.296 | 0.008 | (-1.29+/-0.05)e-4 | (-9.40+/-0.56)e-4 | AMP | BATT 2 CHARGE CURRENT |
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| eb2di | 0.015 | 0.000 | (0.00+/-0.00)e0 | (3.10+/-0.12)e-8 | AMP | BATT 2 DISCHARGE CURRENT |
| eb2v | 32.334 | 0.014 | (5.02+/-6.64)e-6 | -0.002+/-0.000 | V | BATT 2 VOLTAGE |
| ecnv1v | 14.893 | 0.003 | (1.42+/-0.22)e-5 | 0.001+/-0.000 | V | CONV 1 +15V OUTPUT |
| ecnv2v | 14.846 | 0.011 | (3.49+/-0.91)e-5 | 0.005+/-0.000 | V | CONV 2 +15V OUTPUT |
| ecnv3v | 15.295 | 0.003 | (-4.57+/-2.38)e-6 | (-2.29+/-0.09)e-4 | V | CONV 3 +15V OUTPUT |
- Spacecraft Electronics
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| elbi | 54.839 | 1.290 | -0.001+/-0.001 | -0.177+/-0.007 | AMP | LOAD BUS CURRENT |
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| elbv | 28.424 | 0.141 | 0.006+/-0.000 | 0.017+/-0.001 | V | LOAD BUS VOLTAGE |
- OBA Heater
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| oobthr04 | 299.792 | 0.600 | 0.002+/-0.000 | 0.206+/-0.011 | K | RT 27: HRMA STRUT |
|---|---|---|---|---|---|---|
| oobthr12 | 298.704 | 1.261 | 0.002+/-0.001 | 0.257+/-0.014 | K | RT 35: OBA FWD CONE |
| oobthr26 | 301.428 | 2.787 | 0.005+/-0.002 | 0.479+/-0.022 | K | RT 48: OBA AFT CONE |
| oobthr38 | 283.190 | 0.012 | (-4.98+/-0.84)e-5 | (-1.02+/-0.89)e-4 | K | RT 60: TFTE FWD CYLINDER |
| oobthr44 | 300.294 | 1.170 | 0.004+/-0.001 | 0.181+/-0.011 | K | RT 66: TFTE AFT CYLINDER |
| oobthr50 | 295.016 | 1.046 | 0.003+/-0.001 | 0.429+/-0.018 | 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
