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_oct21 6004901 6.511 8.080 0.0 938 I2 node 0 262654 7.358010 3.355546 0.0 77.0 I2 node 1 262654 7.833799 4.256484 0.0 929.0 I2 node 2 262654 9.379950 4.305087 0.0 92.0 I2 node 3 262654 9.726827 4.583022 0.0 376.0 I3 node 0 262654 9.316097 4.187776 0.0 97.0 I3 node 1 262654 8.987964 4.080253 0.0 140.0 I3 node 2 262654 8.000493 3.618829 0.0 76.0 I3 node 3 262654 7.763041 3.446347 0.0 119.0 S2 node 0 262654 5.865636 2.844881 0.0 73.0 S2 node 1 262654 5.707831 2.861494 0.0 154.0 S2 node 2 262654 5.946113 3.448310 0.0 938.0 S2 node 3 262654 6.252390 3.130470 0.0 352.0 S3 node 0 262654 10.886918 4.023373 0.0 59.0 S3 node 1 262654 12.532228 4.677347 0.0 130.0 S3 node 2 262654 12.277830 3.926029 0.0 61.0 S3 node 3 262654 10.998043 3.685833 0.0 47.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2523.981 3246.142 0.0 139533 I2 node 0 262654 2181.990074 438.121319 465.0 13069.0 I2 node 1 262654 2294.660609 621.717097 482.0 123698.0 I2 node 2 262654 2322.768759 492.703344 501.0 13575.0 I2 node 3 262654 2328.907732 602.034056 474.0 28803.0 I3 node 0 262654 2501.870174 615.408580 461.0 13543.0 I3 node 1 262654 2578.773059 1726.068713 499.0 55696.0 I3 node 2 262654 2292.894084 429.635686 469.0 13621.0 I3 node 3 262654 2284.931408 461.531937 436.0 34380.0 S2 node 0 262654 2940.948602 476.440070 1600.0 22279.0 S2 node 1 262654 3117.623930 707.337012 1784.0 16900.0 S2 node 2 262654 3450.684325 712.854738 2202.0 29159.0 S2 node 3 262654 3413.335017 567.743104 1940.0 69439.0 S3 node 0 262654 5243.679454 2890.122072 2278.0 53410.0 S3 node 1 262654 6435.342822 2350.026504 0.0 38221.0 S3 node 2 262654 5174.636692 1336.845996 2338.0 27113.0 S3 node 3 262654 4044.323160 751.506620 2445.0 26352.0
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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 2021 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -111.03 | +/- 4.77 C |
| Mean Width: | |
| 0.86 | +/- 0.49 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_2021.fits 16777216 0.167 0.413 0.000 7.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_10_2021.fits 16777216 7.598 6.552 0.000 314.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_10_2021.fits 16777216 0.012 0.113 0.000 4.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_10_2021.fits 16777216 20.669 36.617 0.000 1766.000
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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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| 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 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 | 7.995e-05 | 2.197e-05 | 0.34 +/- 0.05 | 0.01 +/- 0.00 | AMP | BATT 2 CHARGE CURRENT | on | 9.548e-04 | 9.034e-04 | 0.34 +/- 0.05 | (0.00+/-0.00)e0 |
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| eb2di | off | 4.132e-05 | 3.166e-05 | 0.01 +/- 0.07 | -(4.08+/-5.74)e-4 | AMP | BATT 2 DISCHARGE CURRENT | on | -0.003 | 0.022 | 0.28 +/- 1.15 | (0.00+/-0.00)e0 |
| eb2v | off | 9.104e-04 | 2.223e-05 | 32.44 +/- 0.06 | -0.01 +/- 0.00 | V | BATT 2 VOLTAGE | on | 0.006 | 0.011 | 32.20 +/- 0.56 | (0.00+/-0.00)e0 |
| ecnv1v | 8.063e-06 | 2.272e-06 | 14.89 +/- 0.01 | -0.00 +/- 0.00 | V | CONV 1 +15V OUTPUT | |
| ecnv2v | 3.339e-05 | 3.613e-06 | 14.84 +/- 0.01 | -0.00 +/- 0.00 | V | CONV 2 +15V OUTPUT | |
| ecnv3v | -1.178e-05 | 1.556e-06 | 15.29 +/- 0.00 | -(1.39+/-3.55)e-4 | V | CONV 3 +15V OUTPUT | |
- Spacecraft Electronics
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| elbi | -0.001 | 6.607e-04 | 53.58 +/- 1.55 | 0.17 +/- 0.28 | AMP | LOAD BUS CURRENT | |
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| elbv | off | -0.005 | 4.892e-05 | 28.54 +/- 0.24 | (6.99+/-162.60)e-4 | V | LOAD BUS VOLTAGE | on | 0.005 | 0.004 | 28.71 +/- 0.22 | (0.00+/-0.00)e0 |
- OBA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| oobthr04 | 0.009 | 5.965e-04 | (3.01+/-0.01)e2 | 0.47 +/- 0.45 | K | RT 27: HRMA STRUT | |
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| oobthr12 | 0.010 | 9.214e-04 | (2.99+/-0.02)e2 | 1.03 +/- 0.70 | K | RT 35: OBA CONE | |
| oobthr26 | 0.012 | 0.001 | (3.02+/-0.03)e2 | 2.26 +/- 0.98 | K | RT 48: OBA CONE | |
| oobthr38 | 3.685e-06 | 6.316e-06 | (2.83+/-0.00)e2 | 0.01 +/- 0.00 | K | RT 60: TFTE CONE | |
| oobthr44 | 0.011 | 9.639e-04 | (3.01+/-0.02)e2 | 1.26 +/- 0.77 | K | RT 66: TFTE COVER | |
| oobthr50 | 0.012 | 7.681e-04 | (2.96+/-0.02)e2 | 0.30 +/- 0.59 | 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
