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_oct20 6004901 9.596 15.103 0.0 1449 I2 node 0 262654 6.522337 3.119512 0.0 48.0 I2 node 1 262654 6.891331 4.820166 0.0 1449.0 I2 node 2 262654 6.624239 3.078325 0.0 74.0 I2 node 3 262654 6.707898 4.335061 0.0 1436.0 I3 node 0 262654 8.823436 3.903102 0.0 429.0 I3 node 1 262654 8.618823 3.706054 0.0 131.0 I3 node 2 262654 8.426238 3.530595 0.0 114.0 I3 node 3 262654 8.631838 3.660674 0.0 167.0 S2 node 0 262654 11.074820 4.450597 0.0 265.0 S2 node 1 262654 12.215562 6.586465 0.0 387.0 S2 node 2 262654 15.050414 15.254654 0.0 569.0 S2 node 3 262654 17.896715 26.630461 0.0 1332.0 S3 node 0 262654 21.102060 26.492927 1.0 415.0 S3 node 1 262654 21.691939 18.504510 0.0 667.0 S3 node 2 262654 22.860635 19.167063 2.0 252.0 S3 node 3 262654 17.915344 9.005642 0.0 171.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 2436.460 3133.943 0.0 135735 I2 node 0 262654 2109.461316 421.834962 447.0 12397.0 I2 node 1 262654 2218.633865 595.656729 461.0 112232.0 I2 node 2 262654 2245.858072 474.841756 476.0 12810.0 I2 node 3 262654 2251.273208 580.853379 450.0 28715.0 I3 node 0 262654 2409.529510 592.703327 449.0 12120.0 I3 node 1 262654 2487.953947 1712.684258 480.0 55535.0 I3 node 2 262654 2208.155131 412.013272 449.0 12916.0 I3 node 3 262654 2200.472045 443.367942 414.0 33561.0 S2 node 0 262654 2841.857342 453.010569 1561.0 22147.0 S2 node 1 262654 3012.445421 675.923261 1740.0 16427.0 S2 node 2 262654 3331.696013 672.851688 2159.0 27938.0 S2 node 3 262654 3294.990720 526.600827 1912.0 65823.0 S3 node 0 262654 5031.122036 2402.896603 2196.0 35570.0 S3 node 1 262654 6255.439473 2321.604607 0.0 35623.0 S3 node 2 262654 4990.788063 1287.895263 2210.0 26031.0 S3 node 3 262654 3874.460870 684.858389 2369.0 25429.0
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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 2020 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -111.72 | +/- 3.64 C |
| Mean Width: | |
| 0.87 | +/- 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 |
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| 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_2020.fits 16777216 0.163 0.432 0.000 8.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCI_08_1999_10_2020.fits 16777216 6.609 6.126 0.000 307.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_10_2020.fits 16777216 0.004 0.076 0.000 12.000
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IMAGE NPIX MEAN STDDEV MIN MAX HRCS_08_1999_10_2020.fits 16777216 19.090 34.408 0.000 1751.000
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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 2020
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 | -8.761e-05 | 4.169e-05 | 0.28 +/- 0.10 | -(9.65+/-14.21)e-4 | 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 | -3.005e-04 | 8.881e-05 | 0.02 +/- 0.21 | (2.84+/-1.70)e-5 | AMP | BATT 2 DISCHARGE CURRENT | on | 0.003 | 0.059 | 0.42 +/- 1.54 | (0.00+/-0.00)e0 |
| eb2v | off | 7.587e-04 | 4.604e-05 | 32.30 +/- 0.11 | -0.00 +/- 0.00 | V | BATT 2 VOLTAGE | on | 0.009 | 0.027 | 31.99 +/- 0.71 | (0.00+/-0.00)e0 |
| ecnv1v | -1.335e-05 | 3.034e-06 | 14.89 +/- 0.01 | 0.00 +/- 0.00 | V | CONV 1 +15V OUTPUT | |
| ecnv2v | 1.417e-05 | 4.992e-06 | 14.85 +/- 0.01 | 0.01 +/- 0.00 | V | CONV 2 +15V OUTPUT | |
| ecnv3v | -1.168e-13 | 999.000 | 15.29 +/- 0.00 | (2.17+/-4.78)e-4 | V | CONV 3 +15V OUTPUT | |
- Spacecraft Electronics
| Previous Quarter | |||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION | |
| elbi | -0.003 | 6.007e-04 | 54.69 +/- 1.39 | -0.20 +/- 0.23 | AMP | LOAD BUS CURRENT | |
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| elbv | off | -0.004 | 4.364e-05 | 28.67 +/- 0.18 | -0.01 +/- 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 | -0.011 | 6.429e-04 | (3.00+/-0.02)e2 | 0.28 +/- 0.35 | K | RT 27: HRMA STRUT | |
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| oobthr12 | -0.017 | 9.640e-04 | (2.99+/-0.02)e2 | 0.11 +/- 0.52 | K | RT 35: OBA CONE | |
| oobthr26 | -0.013 | 0.002 | (3.02+/-0.04)e2 | 1.08 +/- 0.78 | K | RT 48: OBA CONE | |
| oobthr38 | -1.040e-04 | 4.635e-06 | (2.83+/-0.00)e2 | 0.00 +/- 0.00 | K | RT 60: TFTE CONE | |
| oobthr44 | -0.013 | 8.981e-04 | (3.01+/-0.02)e2 | 0.41 +/- 0.62 | K | RT 66: TFTE COVER | |
| oobthr50 | -0.011 | 8.755e-04 | (2.95+/-0.02)e2 | 0.67 +/- 0.50 | 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
