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_apr20 6004901 8.758 11.375 0.0 2558 I2 node 0 262654 8.553625 3.678449 0.0 84.0 I2 node 1 262654 8.983525 3.980809 0.0 149.0 I2 node 2 262654 8.867126 3.675471 0.0 102.0 I2 node 3 262654 8.800888 6.308542 0.0 2558.0 I3 node 0 262654 11.543464 4.525497 0.0 378.0 I3 node 1 262654 11.341533 4.353429 0.0 383.0 I3 node 2 262654 11.152409 4.103492 0.0 98.0 I3 node 3 262654 11.006609 4.212686 0.0 274.0 S2 node 0 262654 11.454749 4.418617 0.0 109.0 S2 node 1 262654 11.807046 5.008265 0.0 441.0 S2 node 2 262654 11.916192 6.956971 0.0 2419.0 S2 node 3 262654 11.703953 4.972622 0.0 813.0 S3 node 0 262654 13.022802 5.789670 0.0 126.0 S3 node 1 262654 15.746250 9.810098 0.0 2033.0 S3 node 2 262654 14.134597 4.365510 0.0 71.0 S3 node 3 262654 12.771997 4.155713 0.0 47.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2385.967 3077.165 0.0 133449 I2 node 0 262654 2069.753394 413.112814 438.0 12078.0 I2 node 1 262654 2177.366167 580.931618 451.0 104877.0 I2 node 2 262654 2205.276977 466.556900 464.0 12380.0 I2 node 3 262654 2210.589317 569.781388 443.0 28674.0 I3 node 0 262654 2360.445586 580.915049 441.0 11051.0 I3 node 1 262654 2440.053166 1707.176300 467.0 55462.0 I3 node 2 262654 2160.855365 402.698117 436.0 12567.0 I3 node 3 262654 2153.218249 433.113107 400.0 33112.0 S2 node 0 262654 2784.551689 442.310814 1539.0 22058.0 S2 node 1 262654 2950.654346 661.415261 1712.0 16142.0 S2 node 2 262654 3260.417532 663.756052 2144.0 27874.0 S2 node 3 262654 3213.929275 522.326708 1896.0 63441.0 S3 node 0 262654 4905.586144 2334.599404 2152.0 34248.0 S3 node 1 262654 6137.526941 2298.676144 0.0 32713.0 S3 node 2 262654 4884.951945 1286.365455 2136.0 25823.0 S3 node 3 262654 3786.419853 679.511360 2320.0 25242.0
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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 2020 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -112.26 | +/- 2.89 C |
| Mean Width: | |
| 0.68 | +/- 0.27 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_2020.fits 16777216 0.138 0.375 0.000 9.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_04_2020.fits 16777216 6.402 6.014 0.000 306.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_04_2020.fits 16777216 0.009 0.096 0.000 4.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_04_2020.fits 16777216 19.014 34.209 0.000 1750.000
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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 2020
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 | -4.710e-04 | 4.904e-05 | 0.30 +/- 0.12 | 0.00 +/- 0.00 | AMP | BATT 2 CHARGE CURRENT | |
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| eb2di | -5.429e-04 | 1.109e-04 | 0.02 +/- 0.26 | -(1.53+/-2.20)e-5 | AMP | BATT 2 DISCHARGE CURRENT | |
| eb2v | 8.244e-04 | 4.815e-05 | 32.30 +/- 0.12 | -(2.37+/-15.99)e-4 | V | BATT 2 VOLTAGE | |
| ecnv1v | -2.895e-06 | 3.286e-06 | 14.89 +/- 0.01 | -0.00 +/- 0.00 | V | CONV 1 +15V OUTPUT | |
| ecnv2v | 8.999e-06 | 4.482e-06 | 14.85 +/- 0.01 | -0.00 +/- 0.00 | V | CONV 2 +15V OUTPUT | |
| ecnv3v | -2.158e-13 | 999.000 | 15.29 +/- 0.00 | (1.36+/-3.99)e-4 | V | CONV 3 +15V OUTPUT | |
- Spacecraft Electronics
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| elbi | 8.633e-04 | 5.608e-04 | 54.80 +/- 1.30 | 0.32 +/- 0.22 | AMP | LOAD BUS CURRENT | |
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| elbv | 0.004 | 3.630e-05 | 28.27 +/- 0.18 | 0.01 +/- 0.01 | V | LOAD BUS VOLTAGE | |
- OBA Heater
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| oobthr04 | -0.004 | 3.688e-04 | (3.01+/-0.01)e2 | 0.48 +/- 0.30 | K | RT 27: HRMA STRUT | |
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| oobthr12 | -0.004 | 6.241e-04 | (3.00+/-0.01)e2 | 1.25 +/- 0.49 | K | RT 35: OBA CONE | |
| oobthr26 | -0.006 | 0.001 | (3.03+/-0.03)e2 | 1.00 +/- 0.80 | K | RT 48: OBA CONE | |
| oobthr38 | -5.841e-06 | 5.111e-06 | (2.83+/-0.00)e2 | 0.01 +/- 0.00 | K | RT 60: TFTE CONE | |
| oobthr44 | -0.004 | 6.409e-04 | (3.02+/-0.02)e2 | 0.75 +/- 0.54 | K | RT 66: TFTE COVER | |
| oobthr50 | -0.006 | 5.192e-04 | (2.97+/-0.01)e2 | 1.25 +/- 0.45 | 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
