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_aug13 6004901 6.774 9.870 0.0 1606 I2 node 0 262654 6.990955 3.147330 0.0 41.0 I2 node 1 262654 7.257243 3.514510 0.0 422.0 I2 node 2 262654 7.289574 3.715463 0.0 1000.0 I2 node 3 262654 7.735983 3.429781 0.0 82.0 I3 node 0 262654 7.391148 3.311185 0.0 33.0 I3 node 1 262654 7.871834 6.839943 0.0 158.0 I3 node 2 262654 6.961558 3.111012 0.0 52.0 I3 node 3 262654 6.885838 3.142679 0.0 146.0 S2 node 0 262654 7.660355 3.329519 0.0 190.0 S2 node 1 262654 7.846580 3.843746 0.0 58.0 S2 node 2 262654 8.013224 6.225240 0.0 1606.0 S2 node 3 262654 7.767612 3.412873 0.0 400.0 S3 node 0 262654 17.379339 19.215230 0.0 181.0 S3 node 1 262654 12.510983 5.689656 0.0 378.0 S3 node 2 262654 11.448549 3.769656 0.0 53.0 S3 node 3 262654 10.411275 3.575942 0.0 30.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1734.319 2289.692 0.0 101840 I2 node 0 262654 1459.312424 287.868778 0.0 8912.0 I2 node 1 262654 1534.240188 386.365234 0.0 34608.0 I2 node 2 262654 1563.058899 335.267567 0.0 6673.0 I2 node 3 262654 1559.339212 395.238824 0.0 9366.0 I3 node 0 262654 1635.768562 400.184659 0.0 6456.0 I3 node 1 262654 1716.999195 1303.742240 0.0 33251.0 I3 node 2 262654 1498.050029 277.061611 0.0 7421.0 I3 node 3 262654 1483.861137 294.980089 0.0 25849.0 S2 node 0 262654 2086.556051 318.858099 1089.0 28632.0 S2 node 1 262654 2224.142892 489.018131 1138.0 12280.0 S2 node 2 262654 2461.119125 481.270153 1478.0 42148.0 S2 node 3 262654 2395.275428 365.024668 1418.0 39612.0 S3 node 0 262654 3629.782200 1721.262512 1501.0 12788.0 S3 node 1 262654 4733.273922 1922.105414 0.0 13058.0 S3 node 2 262654 3652.831422 924.027248 1463.0 9153.0 S3 node 3 262654 2857.583003 448.051317 1629.0 9327.0
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| May 2013 | Feb 2013 | Nov 2012 | Aug 2012 |
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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 2013 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -115.50 | +/- 4.18 C |
| Mean Width: | |
| 0.39 | +/- 0.39 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 |
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_08_2013.fits 16777216 3.993 4.788 0.0 292.0
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_08_2013.fits 16777216 14.610 24.429 0.0 1640.0
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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
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 (e.g., obsid 6558).
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 2013
Sun Spot History
Trending
Quarterly Trends
- ACA Thermal
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AACBPPT | 304.78 | 1.08 | 4.514e+00 | -1.050e+02 | K | AC BASEPLATE TEMP (PRIME) |
| AACBPRT | 299.67 | 1.07 | 4.504e+00 | -1.042e+02 | K | AC BASEPLATE TEMP (RDNT) |
| AACCCDPT | 256.27 | 1.06 | 4.576e+00 | -1.051e+02 | K | AC CCD TEMP (PRI) |
| AACCCDRT | 299.70 | 1.16 | 4.900e+00 | -1.115e+02 | K | AC CCD TEMP (RDNT) |
| AACH1T | 296.89 | 1.18 | 5.071e+00 | -1.133e+02 | K | AC HOUSING TEMP (ACH1) |
| AACH2T | 296.93 | 1.18 | 5.089e+00 | -1.143e+02 | K | AC HOUSING TEMP (ACH2) |
| AAOTALT | 296.53 | 1.18 | 5.077e+00 | -1.139e+02 | K | AC OPT TEL ASSY LENS TEMP |
| AAOTAPMT | 295.84 | 1.18 | 5.094e+00 | -1.139e+02 | K | AC OPT TEL ASSY PRIMARY MIRROR TEMP |
| AAOTASMT | 295.99 | 1.18 | 5.028e+00 | -1.128e+02 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP |
| AAOTH2MT | 296.46 | 1.18 | 5.051e+00 | -1.133e+02 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP (HRMA) |
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- IRU Temperatures and Electronics
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AFSSPC1V | 3.51 | 6.771e-03 | 9.316e-03 | -3.395e-01 | V | FSS POWER CONV 1 VOLTAGE |
| AFSSPC2V | 3.52 | 1.479e-03 | 4.497e-03 | -1.787e-02 | V | FSS POWER CONV 2 VOLTAGE |
| AGWS2V | 2.70 | 3.245e-04 | -7.913e-04 | 6.170e-03 | V | GYRO WHEEL SUPPLY 2 INPUT VOLTAGE |
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- MUPS
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| PM2THV1T | 327.43 | 17.94 | -8.222e+00 | -1.286e+03 | K | MUPS 2 THRUSTER VALVE 01 TEMP |
| PM3THV1T | 295.98 | 1.35 | 1.139e+00 | 1.155e+02 | K | MUPS 3 THRUSTER VALVE 01 TEMP |
| PFTANKIP | 1.967e+03 | 17.41 | 5.507e+01 | 6.457e+02 | PSIA | FUEL TANK INLET PRESSURE |
| PFTANKOP | 1.941e+03 | 18.57 | 5.702e+01 | 9.516e+02 | PSIA | FUEL TANK OUTLET PRESSURE |
| PHETANKP | 629.62 | 0.000e+00 | 0.000e+00 | 0.000e+00 | PSIA | HE TANK PRESSURE |
| PXTANKIP | 1.900e+03 | 4.63 | 2.716e-01 | -7.676e+01 | PSIA | OX TANK INLET PRESSURE |
| PXTANKOP | 1.914e+03 | 4.16 | -6.335e-01 | -1.533e+02 | PSIA | |
| PLINE01T | 289.49 | 2.69 | 5.190e+00 | 2.799e+01 | K | PROP LINE TEMP 01 |
| PLINE02T | 320.68 | 9.61 | -1.517e+00 | 5.416e+02 | K | PROP LINE TEMP 02 |
| PLINE03T | 318.18 | 11.95 | 4.329e-01 | 6.675e+02 | K | PROP LINE TEMP 03 |
| PLINE04T | 304.38 | 11.62 | 8.152e+00 | 6.499e+02 | K | PROP LINE TEMP 04 |
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Envelope Trending
Spacecraft Anc Temperature
Spacecraft Main Temperature
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 | Jul | Aug | Sep | Oct | Nov | Dec |
| 2013 | Jan | Feb | Mar | Apr | May | Jun | Jul | |||||