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_jul12 6004901 7.444 10.429 0.0 4249 I2 node 0 262654 7.551685 5.843318 0.0 106.0 I2 node 1 262654 7.382344 3.579157 0.0 253.0 I2 node 2 262654 7.139988 3.145438 0.0 49.0 I2 node 3 262654 7.032219 3.335477 0.0 55.0 I3 node 0 262654 8.353814 3.539747 0.0 44.0 I3 node 1 262654 9.148808 8.211923 0.0 204.0 I3 node 2 262654 8.512602 3.543503 0.0 48.0 I3 node 3 262654 8.149555 3.406113 0.0 144.0 S2 node 0 262654 8.548143 3.727566 0.0 387.0 S2 node 1 262654 8.677167 3.937898 0.0 64.0 S2 node 2 262654 9.265077 4.046080 0.0 348.0 S2 node 3 262654 9.502055 3.452652 0.0 421.0 S3 node 0 262654 11.698143 5.124853 0.0 87.0 S3 node 1 262654 12.783022 4.434870 0.0 68.0 S3 node 2 262654 12.346243 3.693091 0.0 42.0 S3 node 3 262654 10.756268 3.422518 0.0 67.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1640.621 2171.551 0.0 96754 I2 node 0 262654 1332.922752 257.301421 0.0 6836.0 I2 node 1 262654 1407.084992 347.756881 0.0 28886.0 I2 node 2 262654 1440.720364 311.210929 0.0 8950.0 I2 node 3 262654 1436.649732 366.945125 0.0 27734.0 I3 node 0 262654 1505.699017 366.632343 0.0 6573.0 I3 node 1 262654 1581.381390 1196.521395 0.0 30725.0 I3 node 2 262654 1376.106864 250.856377 0.0 6599.0 I3 node 3 262654 1360.587055 266.217168 0.0 24173.0 S2 node 0 262654 1922.315568 270.890990 1001.0 20846.0 S2 node 1 262654 2043.987399 442.201256 1038.0 11316.0 S2 node 2 262654 2266.455427 427.316118 1345.0 16498.0 S2 node 3 262654 2195.659925 314.853875 1282.0 35223.0 S3 node 0 262654 3352.254599 1666.017233 1401.0 13116.0 S3 node 1 262654 4553.569234 1980.526894 0.0 13624.0 S3 node 2 262654 3450.842509 927.399098 1321.0 8613.0 S3 node 3 262654 2655.279163 419.410893 1492.0 9584.0
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| Apr 2012 | Jan 2012 | Oct 2011 | Jul 2011 |
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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 2012 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -117.66 | +/- 0.72 C |
| Mean Width: | |
| 0.70 | +/- 0.69 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 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.
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_07_2012.fits 16777216 3.877 4.725 0.0 292.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_07_2012.fits 16777216 0.064 0.596 0.0 68.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_07_2012.fits 16777216 14.175 23.882 0.0 1634.0
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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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| Apr 2012 | Jan 2012 | Oct 2011 | Jul 2011 |
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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-1
ACIS-6
HRC-I-1
HRC-S-1
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 2012
Sun Spot History
Trending
Quarterly Trends
- PCAD Temperature
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AACBPPT | 302.63 | 1.07 | 1.672e+00 | -7.576e+01 | K | AC BASEPLATE TEMP (PRIME) |
| AACBPRT | 297.55 | 0.95 | 1.506e+00 | -4.708e+01 | K | AC BASEPLATE TEMP (RDNT) |
| AACCCDPT | 254.26 | 0.76 | 1.161e+00 | -4.722e+01 | K | AC CCD TEMP (PRI) |
| AACCCDRT | 297.42 | 1.02 | 1.685e+00 | -4.950e+01 | K | AC CCD TEMP (RDNT) |
| AACH1T | 294.56 | 0.95 | 1.430e+00 | -3.078e+01 | K | AC HOUSING TEMP (ACH1) |
| AACH2T | 294.61 | 0.95 | 1.460e+00 | -3.255e+01 | K | AC HOUSING TEMP (ACH2) |
| AAOTALT | 294.20 | 0.94 | 1.425e+00 | -3.285e+01 | K | AC OPT TEL ASSY LENS TEMP |
| AAOTAPMT | 293.53 | 0.93 | 1.441e+00 | -3.632e+01 | K | AC OPT TEL ASSY PRIMARY MIRROR TEMP |
| AAOTASMT | 293.66 | 0.93 | 1.423e+00 | -3.395e+01 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP |
| AAOTH2MT | 294.12 | 0.94 | 1.466e+00 | -3.348e+01 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP (HRMA) |
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- MUPS
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| PM1THV1T | 331.85 | 8.13 | 7.987e+00 | -7.932e+02 | K | MUPS 1 THRUSTER VALVE 01 TEMP |
| PM1THV2T | 333.23 | 6.59 | 1.100e+01 | -5.779e+02 | K | MUPS 1 THRUSTER VALVE 02 TEMP |
| PM2THV1T | 327.43 | 17.94 | -8.222e+00 | -1.286e+03 | K | MUPS 2 THRUSTER VALVE 01 TEMP |
| PM2THV2T | 326.98 | 11.50 | 3.408e+00 | -4.843e+02 | K | MUPS 2 THRUSTER VALVE 02 TEMP |
| PMTANK1T | 295.57 | 1.61 | 2.272e+00 | -1.325e+02 | K | MUPS TANK TEMP 1 |
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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 | Oct | Nov | Dec |
| 2012 | Jan | Feb | Mar | Apr | May | Jun | ||||||