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_jul11 6004901 6.633 9.181 0.0 388 I2 node 0 262654 6.426853 2.955090 0.0 61.0 I2 node 1 262654 6.858088 3.326109 0.0 320.0 I2 node 2 262654 6.770473 3.076818 0.0 60.0 I2 node 3 262654 6.785373 3.265490 0.0 257.0 I3 node 0 262654 6.759901 3.045581 0.0 34.0 I3 node 1 262654 7.098381 6.729143 0.0 156.0 I3 node 2 262654 6.529029 2.893333 0.0 50.0 I3 node 3 262654 6.382671 2.885783 0.0 95.0 S2 node 0 262654 7.987289 4.078951 0.0 76.0 S2 node 1 262654 8.291534 4.316237 0.0 64.0 S2 node 2 262654 9.444060 6.708209 0.0 139.0 S2 node 3 262654 9.664710 8.416064 0.0 267.0 S3 node 0 262654 11.229006 6.353302 0.0 197.0 S3 node 1 262654 12.699798 7.314637 0.0 130.0 S3 node 2 262654 13.133647 9.066437 0.0 135.0 S3 node 3 262654 12.000591 9.630538 0.0 145.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1525.55 2049.71 0.0 92223 I2 node 0 262654 1254.665874 241.595292 0.0 6238.0 I2 node 1 262654 1324.295069 323.725373 0.0 25858.0 I2 node 2 262654 1359.332470 294.837152 0.0 8840.0 I2 node 3 262654 1354.956128 346.080813 0.0 27645.0 I3 node 0 262654 1421.021682 347.521539 0.0 6399.0 I3 node 1 262654 1490.392925 1120.531443 0.0 28841.0 I3 node 2 262654 1294.245966 234.328860 0.0 6097.0 I3 node 3 262654 1280.563633 249.844737 0.0 22955.0 S2 node 0 262654 1824.739342 252.967177 939.0 20106.0 S2 node 1 262654 1940.432730 416.090378 973.0 10652.0 S2 node 2 262654 2151.665644 404.862679 1257.0 15278.0 S2 node 3 262654 2078.442352 296.754117 1209.0 32374.0 S3 node 0 262654 3154.945113 1600.353287 1303.0 12929.0 S3 node 1 262654 4363.900354 1937.769284 0.0 13436.0 S3 node 2 262654 3299.353879 897.519537 1239.0 8284.0 S3 node 3 262654 2534.353828 405.466208 1393.0 9314.0
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| Apr 2011 | Jan 2011 | Oct 2010 | Jul 2010 |
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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
Jul 2011 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -116.72 | +/- 1.97 C |
| Mean Width: | |
| 1.24 | +/- 1.18 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 |
ACIS Corner Pixels
We plot the average corner pixel centroid slope and mean for ACIS observations. Separate plots are shown for FAINT MODE (3X3) and VFAINT MODE (5X5) observations. Metric is the centroid of a Gaussian fit to the histogram of corner pixel PHA values of detected events. Plus signs are FAINT observations, diamonds are VFAINT observations, and boxes are VFAINT observations with centroids computed using only the corner pixels of a 3X3 event island (referred to as AFAINT). We see a very small upward trend.
CCD: I3
CCD: S3
ACIS Bias Trends
The bias plus overclock level was calculated as follows:
- Get acisf*bias0.fits is obtained from a database or /dsops/ap/sdp/cache/*/acis/
- Data with timed mode exposure is selected.
- Fits files were divided into 4 quads, then an average of bias level for each quad is computed. No corrections for dead spots, columns etc were included.
An example of Overclock values as reported in FITS file header:
An example of mean bias minus overclock value:
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_07_2011.fits 16777216 0.060 0.079 0.0 10.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_07_2011.fits 16777216 3.543 4.380 0.0 292.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_07_2011.fits 16777216 0.029 0.279 0.0 39.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_07_2011.fits 16777216 13.729 22.889 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.
PCAD
ACA Trending
ACIS-I
ACIS-S
HRC-I
HRC-S
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 Jul 2011
Sun Spot History
Trending
Quarterly Trends
- ACA Thermal
- ACA Thermal
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AACBPPT | 302.09 | 1.55 | 4.834e+00 | 2.154e+01 | K | AC BASEPLATE TEMP (PRIME) |
| AACBPRT | 297.09 | 1.25 | 4.004e+00 | 1.867e+01 | K | AC BASEPLATE TEMP (RDNT) |
| AACCCDPT | 255.51 | 7.56 | -6.022e+00 | -2.050e+02 | K | AC CCD TEMP (PRI) |
| AACCCDRT | 296.92 | 1.35 | 4.389e+00 | 1.595e+01 | K | AC CCD TEMP (RDNT) |
| AACH1T | 294.09 | 1.17 | 3.990e+00 | 1.862e+01 | K | AC HOUSING TEMP (ACH1) |
| AACH2T | 294.13 | 1.17 | 4.054e+00 | 2.222e+01 | K | AC HOUSING TEMP (ACH2) |
| AAOTALT | 293.74 | 1.15 | 3.942e+00 | 2.147e+01 | K | AC OPT TEL ASSY LENS TEMP |
| AAOTAPMT | 293.07 | 1.12 | 3.846e+00 | 2.493e+01 | K | AC OPT TEL ASSY PRIMARY MIRROR TEMP |
| AAOTASMT | 293.19 | 1.12 | 3.824e+00 | 2.453e+01 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP |
| AAOTH2MT | 293.66 | 1.15 | 3.963e+00 | 1.921e+01 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP (HRMA) |
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| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 4RT575T | 290.02 | 1.43 | 3.284e+00 | -3.905e+01 | K | RT 575 - OB CONE TEMP |
| 4RT576T | 284.10 | 1.12 | 1.868e+00 | -4.042e+01 | K | RT 576 - OB CONE TEMP |
| 4RT577T | 290.10 | 2.28 | 3.129e+00 | -9.519e+01 | K | RT 577 - OB CONE TEMP |
| 4RT578T | 288.13 | 1.91 | 1.940e+00 | -8.815e+01 | K | RT 578 - OB CONE TEMP |
| 4RT579T | 285.04 | 1.37 | -7.507e-01 | -8.780e+01 | K | RT 579 - OB CONE TEMP |
| 4RT580T | 284.75 | 1.34 | -6.974e-01 | -9.597e+01 | K | RT 580 - OB CONE TEMP |
| 4RT581T | 286.42 | 2.30 | -1.981e+00 | -1.377e+02 | K | RT 581 - OB CONE TEMP |
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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 | ||||||