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.
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Note: Counts and RMS's of Cumulative maps are lower than the previous months.
This is because we excluded extreme outliers.
Please check more detail plots at Telemetered Photon Dose Trend page.
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Statistics: # IMAGE NPIX MEAN RMS MIN MAX ACIS_oct11 6004901 7.894 11.395 0.0 425 I2 node 0 262654 6.895180 3.114534 0.0 47.0 I2 node 1 262654 7.320770 3.532735 0.0 380.0 I2 node 2 262654 7.154179 3.181832 0.0 94.0 I2 node 3 262654 7.140175 3.396952 0.0 44.0 I3 node 0 262654 7.449316 3.313018 0.0 49.0 I3 node 1 262654 7.979263 7.887600 0.0 237.0 I3 node 2 262654 7.302114 3.195634 0.0 59.0 I3 node 3 262654 7.289478 3.222681 0.0 124.0 S2 node 0 262654 9.345868 3.796007 0.0 116.0 S2 node 1 262654 10.428027 4.976732 0.0 69.0 S2 node 2 262654 13.819167 7.478376 0.0 109.0 S2 node 3 262654 14.610597 8.156037 0.0 391.0 S3 node 0 262654 17.903872 23.686277 0.0 378.0 S3 node 1 262654 12.415254 7.795138 0.0 88.0 S3 node 2 262654 14.724889 9.009694 0.0 80.0 S3 node 3 262654 13.698946 8.940118 0.0 71.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1549.10 2079.07 0.0 93504 I2 node 0 262654 1278.730652 246.808743 0.0 6408.0 I2 node 1 262654 1349.860600 331.192591 0.0 26908.0 I2 node 2 262654 1384.236248 299.903879 0.0 8872.0 I2 node 3 262654 1379.714309 352.386814 0.0 27670.0 I3 node 0 262654 1446.197052 352.783841 0.0 6462.0 I3 node 1 262654 1517.438377 1144.684906 0.0 29447.0 I3 node 2 262654 1318.949792 239.332489 0.0 6279.0 I3 node 3 262654 1305.025913 255.001541 0.0 23368.0 S2 node 0 262654 1855.448966 257.567570 963.0 20133.0 S2 node 1 262654 1973.382263 424.633022 999.0 10859.0 S2 node 2 262654 2189.052194 413.254996 1286.0 15676.0 S2 node 3 262654 2115.440430 302.739713 1240.0 33297.0 S3 node 0 262654 3205.528110 1629.508295 1325.0 12999.0 S3 node 1 262654 4400.778890 1945.360123 0.0 13472.0 S3 node 2 262654 3334.059149 903.490613 1252.0 8333.0 S3 node 3 262654 2566.435831 414.687744 1423.0 9384.0
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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
Focal Plane Temperature
Sep 2011 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -109.09 | +/- 7.04 C |
| Mean Width: | |
| 0.80 | +/- 0.72 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)
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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_2011.fits 16777216 0.002 0.044 0.0 2.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_10_2011.fits 16777216 3.565 4.392 0.0 292.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_10_2011.fits 16777216 0.003 0.055 0.0 3.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_10_2011.fits 16777216 13.766 22.906 0.0 1627.0
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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
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 Focus pages. (NOTE: the figures are not updated from Mar 2009 due to a system problem.)
PCAD
ACA Trending
Gyro Bias Drift
Radiation History
Radiation Zone Timing
Plotted below are radiation zone timing plots based on the following definitions of radiation zone:
- RADZONE - Ephin levels (in any of the E1300,P4GM,P41GM channels) are more than 1/3 of RADMON safing thresholds.
- RADMON - Radmon is disabled for radiation zone (as commanded based on OFLS model, for comparison with actual radiation levels).
- PERIGEE - Time of closest earth approach (for comparison)
Radiation Count Rates of Oct 2011
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), and 2700 (Dec 11, 2006). The unit of slopes are mm per day or degree per day.
The sudden shift around DOM = 1400 and 2700 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
- ACIS Electronics A
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 1DE28AVO | 28.31 | 0.23 | -1.800e+00 | 1.025e+01 | V | DEA +28V INPUT A |
| 1DEICACU | 1.53 | 0.33 | -2.906e-01 | -3.066e+00 | AMP | DEA INPUT CURRENT A |
| 1DEP0AVO | 6.17 | 3.780e-02 | -4.826e-02 | -6.403e-01 | V | DEA +6V VOLTAGE A |
| 1DEP1AVO | 15.89 | 0.28 | -3.495e-01 | -2.931e+00 | V | DEA +15V ANALOG A |
| 1DEP2AVO | 24.96 | 0.13 | -3.493e-01 | -2.165e+00 | V | DEA +24V ANALOG A |
| 1DEP3AVO | 30.51 | 0.13 | -4.939e-01 | -1.121e+00 | V | DEA +28V ANALOG A |
| 1DP28AVO | 28.34 | 0.22 | -1.792e+00 | 9.911e+00 | V | DPA +28V INPUT A |
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Spacecraft Motions
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Reaction Wheel Rotations
Note: From Feb 2010, the computation of reaction wheel rotations are slightly modified.
Links to Past Monthly Reports
| Year | Month | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1999 | Jul | Aug | Sep | Oct | Nov | Dec | ||||||
| 2000 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2001 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2002 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2003 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2004 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2005 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2006 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2007 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2008 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2009 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2010 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2011 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | |||