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_aug11 6004901 8.122 8.122 0.0 484 I2 node 0 262654 7.198601 3.146577 0.0 43.0 I2 node 1 262654 7.624872 3.497961 0.0 231.0 I2 node 2 262654 7.407124 3.164158 0.0 57.0 I2 node 3 262654 7.352206 3.420915 0.0 421.0 I3 node 0 262654 7.685454 3.273694 0.0 39.0 I3 node 1 262654 8.247025 7.871861 0.0 194.0 I3 node 2 262654 7.581163 3.168690 0.0 61.0 I3 node 3 262654 7.438683 3.193377 0.0 137.0 S2 node 0 262654 10.500528 3.838377 0.0 252.0 S2 node 1 262654 11.113671 4.591783 0.0 86.0 S2 node 2 262654 11.858437 4.399850 0.0 134.0 S2 node 3 262654 11.157839 3.862507 0.0 483.0 S3 node 0 262654 19.612477 20.810935 0.0 232.0 S3 node 1 262654 17.320756 8.887898 0.0 102.0 S3 node 2 262654 13.919210 4.809992 0.0 45.0 S3 node 3 262654 12.801556 4.632806 0.0 37.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1533.68 2059.89 0.0 92657 I2 node 0 262654 1261.864475 243.048932 0.0 6281.0 I2 node 1 262654 1331.919941 325.695532 0.0 26089.0 I2 node 2 262654 1366.739593 296.221860 0.0 8847.0 I2 node 3 262654 1362.308334 347.795034 0.0 27653.0 I3 node 0 262654 1428.707136 349.013805 0.0 6416.0 I3 node 1 262654 1498.639950 1127.778506 0.0 29035.0 I3 node 2 262654 1301.827129 235.725002 0.0 6158.0 I3 node 3 262654 1288.002315 251.316111 0.0 23092.0 S2 node 0 262654 1835.239871 254.710280 948.0 20115.0 S2 node 1 262654 1951.546401 419.040599 979.0 10737.0 S2 node 2 262654 2163.524081 407.109937 1268.0 15396.0 S2 node 3 262654 2089.600191 297.668345 1210.0 32678.0 S3 node 0 262654 3174.557590 1611.382047 1316.0 12976.0 S3 node 1 262654 4381.221110 1942.238316 0.0 13452.0 S3 node 2 262654 3313.273089 899.759611 1245.0 8312.0 S3 node 3 262654 2547.155384 408.075366 1406.0 9343.0
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| May 2011 | Feb 2011 | Nov 2010 | Aug 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
Aug 2011 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -111.01 | +/- 5.05 C |
| Mean Width: | |
| 0.88 | +/- 0.86 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_08_2011.fits 16777216 0.060 0.079 0.0 10.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_08_2011.fits 16777216 3.543 4.380 0.0 292.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_2011.fits 16777216 0.002 0.041 0.0 4.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_08_2011.fits 16777216 13.310 22.888 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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HRMA Focus
Plots below show various characteristics of detected imaging sources. Standard level 2 data products (*src2.fits) are used. Only observations with focus (sim_x) within 0.01 mm of nominal value for given SI configuration are used. Sources are also filtered for strength (SNR > 15).
For individual detectors, please go to MTA SRC2 Monitoring page.
Source Sky Position
PSF vs Time
Source Ellipse Roundness
80% Encircled Energy Radius
Signal-to-Noise Ratio
Rotation
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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
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Gyro Bias Drift
ACIS-S and HRC Celestial Location Monitoring
Science Instrument Positional Change Monitoring
The following plots are the difference between coordinates obtained from Chandra observations and those obtained from existing catalogs vs time in day of mission.
The following steps are taken to generate these plots.
- all observations with grating are selected
- even if the observation is not grating one, if it is a known point source, it is added to the list.
- observed ra, jan, target ra, jan, nominal ra, jan and a ratio of a target elliptical to psf (psfratio are extracted from src fits files.
- the observations with psfratio smaller than 4 are selected
- the differences between observed coordinates and targeted coordinates (if not available nominal coordinates) are computed
- if the differences are larger than 6 arcsec, the points are dropped
The large dispersion around DOM ~ 2400 (Jan 2005) are all due to none grating Capella observations. Many observations are off-axis observations.
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 Aug 2011
Sun Spot History
Trending
Quarterly Trends
- PCAD Temperature
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 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) |
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- IRU Temperature and Electronics
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AGWS2V | 2.61 | 0.51 | 5.330e-01 | 1.481e+01 | V | GYRO WHEEL SUPPLY 2 INPUT VOLTAGE |
| AIRU1G2T | 295.08 | 10.87 | -1.220e+01 | -3.967e+02 | K | IRU-1 GYRO #2 TEMP |
| AIRU1VFT | 293.60 | 9.27 | -1.040e+01 | -3.382e+02 | K | IRU-1 VFC TEMP |
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- PCAD Gyro Rates
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AI1AX1X | -3.69 | 0.83 | -9.107e-01 | -3.053e+01 | RATE | IRU-1 AXIS 1X ANALOG |
| AI1AX1Y | -3.73 | 0.83 | -9.379e-01 | -3.046e+01 | RATE | IRU-1 AXIS 1Y ANALOG |
| AI1AX2X | -3.70 | 0.83 | -9.215e-01 | -3.055e+01 | RATE | IRU-1 AXIS 2X ANALOG |
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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 | |||||