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_mar21 6004901 5.912 7.666 0.0 393 I2 node 0 262654 7.043748 3.257603 0.0 64.0 I2 node 1 262654 7.382715 3.464615 0.0 113.0 I2 node 2 262654 7.253635 3.265505 0.0 84.0 I2 node 3 262654 7.171610 3.453183 0.0 339.0 I3 node 0 262654 8.121999 3.572305 0.0 164.0 I3 node 1 262654 7.662591 3.316669 0.0 109.0 I3 node 2 262654 7.605500 3.250392 0.0 87.0 I3 node 3 262654 7.729460 3.376713 0.0 119.0 S2 node 0 262654 6.013059 2.922271 0.0 46.0 S2 node 1 262654 6.053824 3.073399 0.0 171.0 S2 node 2 262654 6.303098 3.107670 0.0 205.0 S2 node 3 262654 6.273041 3.083219 0.0 315.0 S3 node 0 262654 9.653359 4.430739 0.0 87.0 S3 node 1 262654 11.045518 4.420815 0.0 393.0 S3 node 2 262654 10.792693 3.782250 0.0 52.0 S3 node 3 262654 9.662267 3.508087 0.0 37.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2472.159 3174.735 0.0 137610 I2 node 0 262654 2139.069223 428.518226 458.0 12666.0 I2 node 1 262654 2249.767729 605.440262 470.0 115815.0 I2 node 2 262654 2276.204696 481.308617 484.0 13162.0 I2 node 3 262654 2281.326989 588.354662 460.0 28745.0 I3 node 0 262654 2448.095650 601.920277 450.0 12847.0 I3 node 1 262654 2525.288195 1715.904758 487.0 55575.0 I3 node 2 262654 2244.112210 419.310925 456.0 13197.0 I3 node 3 262654 2236.800250 451.263598 425.0 33904.0 S2 node 0 262654 2885.118777 461.137073 1582.0 22205.0 S2 node 1 262654 3057.301552 686.662741 1760.0 16663.0 S2 node 2 262654 3380.020290 681.542389 2183.0 28532.0 S2 node 3 262654 3345.737911 535.363939 1927.0 67704.0 S3 node 0 262654 5105.144757 2453.316742 2232.0 37134.0 S3 node 1 262654 6332.688718 2326.379005 0.0 37007.0 S3 node 2 262654 5067.056943 1292.374004 2275.0 26210.0 S3 node 3 262654 3941.329540 688.917905 2406.0 25568.0
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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
Mar 2021 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -112.66 | +/- 3.07 C |
| Mean Width: | |
| 0.72 | +/- 0.45 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 |
ACIS Rejected Events
The links below are plots of stat1 quantities, showing on-board rejected events. The average EVTSENT, DROP_AMP, DROP_POS, DROP_GRD, THR_PIX, and maximum BERR_SUM obtained from L1 acis*stat1.fits files are plotted for each observation. CTI observations are plotted separately from regular science observations.
Column definitions:
- EVTSENT - number of events sent in data record
- DROP_AMP - number of discarded events due to corrected amplitude
- DROP_POS - number of discarded events due to CCD position
- DROP_GRD - number of discarded events due to grade code
- THR_PIX - number of pixels above respective threshold level
- BERR_SUM - number of pixel bias errors so far in science run
Note the half-life decline of the CTI source is clearly evidenced in the steady janline of EVTSENT.
CCD3 Observations
| CTI | Science |
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CCD7 Observations
| CTI | Science |
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ACIS Gain Trends
We computed ACIS gain and offset from ACIS event1 files used in CTI computation, following the step described by C. Grant ACIS gain @ -120C page.
Instead computing gains and offsets from individual observations, we combined all data from each month and computed an monthly averaged gain and offset.
The following plots show CCD3 and CCD5 gains and offset trends.
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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_03_2021.fits 16777216 0.026 0.162 0.000 6.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_03_2021.fits 16777216 6.793 6.214 0.000 311.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_03_2021.fits 16777216 0.318 0.735 0.000 16.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_03_2021.fits 16777216 19.820 35.247 0.000 1755.000
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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.
PCAD
ACA Trending
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Gyro Bias Drift
Radiation History
Radiation Count Rates of Mar 2021
Sun Spot History (See:NOAA Page)
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Trending
Critical Trends
| ACIS Temperatures - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 1pdeaat | -0.005 | 0.003 | (3.04+/-0.07)e2 | -0.98 +/- 1.84 | K | PSMC DEA PS A TEMP | |
| HRMA Computed Averages - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| obaavg | -5.277e-04 | 9.206e-04 | (2.99+/-0.02)e2 | 1.11 +/- 0.61 | TEMP | OBA/TFTE | |
| EPHIN Temperatures - Daily Maximums | |||||||
|---|---|---|---|---|---|---|---|
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| teio | -5.774e-04 | 0.011 | (3.25+/-0.25)e2 | 5.74 +/- 4.13 | K | EPHIN ELECTRONICS HOUSING TEMP | |
| tephin | 0.001 | 0.004 | (3.34+/-0.08)e2 | 6.49 +/- 2.71 | K | EPHIN SENSOR HOUSING TEMP | |
| S/C Main Temperatures - Daily Maximums | |||||||
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| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| tcylfmzm | -0.028 | 0.006 | (3.15+/-0.15)e2 | -3.12 +/- 3.34 | K | CNT CYL TEMP:-Z SIDE UNDER LAE-1 | |
| tcylfmzp | -0.029 | 0.006 | (3.18+/-0.14)e2 | -3.27 +/- 3.03 | K | CNT CYL TEMP:-Z SIDE UNDER LAE-2 | |
| S/C Ancillary Temperatures - Daily Maximums | |||||||
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| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| tfssbkt1 | -0.016 | 0.013 | (3.44+/-0.31)e2 | 3.39 +/- 4.65 | K | FSS BRAC | |
| tfssbkt2 | -0.021 | 0.015 | (3.41+/-0.35)e2 | 1.68 +/- 5.09 | K | FSS BRAC | |
| tsctsf1 | -0.010 | 0.002 | (3.19+/-0.05)e2 | 3.53 +/- 1.55 | K | SC-TS FITTING -1 TEMP | |
| tsctsf6 | 0.001 | 0.002 | (3.18+/-0.05)e2 | 2.79 +/- 1.63 | K | SC-TS FITTING -6 TEMP | |
| MUPS - Daily Maximums | |||||||
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| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| pm1thv1t | -0.018 | 0.008 | (3.49+/-0.18)e2 | 3.79 +/- 3.50 | K | MUPS 1 THRUSTER VALVE 01 TEMP | |
| pm2thv1t | -0.030 | 0.021 | (3.23+/-0.48)e2 | 3.62 +/- 8.49 | K | MUPS 2 THRUSTER VALVE 01 TEMP | |
| pm1thv2t | -0.018 | 0.008 | (3.51+/-0.18)e2 | 4.28 +/- 3.62 | K | MUPS 1 THRUSTER VALVE 02 TEMP | |
| pm2thv2t | -0.025 | 0.026 | (3.06+/-0.62)e2 | 10.81 +/- 9.61 | K | MUPS 2 THRUSTER VALVE 02 TEMP | |
| pline02t | -0.017 | 0.006 | (3.32+/-0.14)e2 | 5.00 +/- 3.13 | K | PROP LINE TEMP 02 | |
| pline03t | -0.023 | 0.007 | (3.28+/-0.16)e2 | 2.36 +/- 2.89 | K | PROP LINE TEMP 03 | |
| pline04t | -0.026 | 0.005 | (3.16+/-0.12)e2 | 4.85 +/- 2.77 | K | PROP LINE TEMP 04 | |
Quarterly Trends
- PCAD FTS Temperature and Gradient
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| ohrthr27 | 2.652e-05 | 5.002e-06 | (2.97+/-0.00)e2 | -(3.89+/-24.79)e-4 | K | RT 20 : PERISCOPE | |
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| ohrthr42 | -1.687e-04 | 1.998e-04 | (2.97+/-0.00)e2 | 0.13 +/- 0.11 | K | RT 133: PERISCOPE | |
| ohrthr43 | -1.190e-04 | 2.223e-04 | (2.97+/-0.01)e2 | 0.25 +/- 0.14 | K | RT 134: PERISCOPE | |
| oobagrd3 | -4.390e-05 | 4.304e-05 | -0.32 +/- 0.10 | -0.09 +/- 0.04 | K | RT 505 TO RT 504: PERISCOPE GRADIENT MONITOR | |
| oobagrd6 | -6.795e-07 | 4.791e-06 | 0.12 +/- 0.01 | 0.01 +/- 0.00 | K | RT 507 TO RT 506: PERISCOPE GRADIENT MONITOR | |
- SIM Temperature
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| 3btu_bpt | 0.010 | 0.002 | (2.69+/-0.06)e2 | -1.89 +/- 1.90 | K | BTU BASEPLATE (+X)), ABORT HTR TSC2 | |
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| 3tsmxcet | 0.013 | 0.019 | (2.42+/-0.44)e2 | -2.07 +/- 6.01 | K | -X TURTLE SHELL NR HRC CEA | |
| 3tsmxspt | 0.079 | 0.084 | (4.42+/-1.97)e2 | 0.86 +/- 26.70 | K | -X TURTLE SHELL NR ACIS SS | |
- SIIM Electronics
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| agrndadc | -2.459e-07 | 4.115e-08 | -(1.71+/-1.24)e-4 | -(4.61+/-307.60)e-7 | V | Analog fround A/D convert reading | |
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| fatabadc | -5.744e-05 | 2.923e-05 | 4.99 +/- 0.09 | -0.00 +/- 0.01 | V | FA Tab Position Sensor A/D Converter | |
| n15vadc | 5.022e-08 | 1.080e-07 | -15.02 +/- 0.00 | -(1.50+/-1.02)e-4 | V | -15V Power Supply A/D Converter Reading | |
| p15vadc | -1.497e-06 | 1.438e-07 | 14.96 +/- 0.00 | -(3.18+/-1.57)e-4 | V | +15V Power Supply A/D Converter Reading | |
| p5vadc | -3.313e-05 | 7.373e-06 | 4.97 +/- 0.02 | -(6.63+/-103.40)e-4 | V | +5V Power Supply A/D Converter Reading | |
| tsctabadc | -1.963e-04 | 5.921e-05 | 4.97 +/- 0.18 | -0.01 +/- 0.03 | V | TSC Tab Position Sensor A/D converter | |
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
