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_dec11 6004901 7.447 10.428 0.0 516 I2 node 0 262654 8.565929 3.647022 0.0 77.0 I2 node 1 262654 9.072552 4.063622 0.0 323.0 I2 node 2 262654 9.036079 3.737358 0.0 69.0 I2 node 3 262654 9.021403 4.075106 0.0 408.0 I3 node 0 262654 9.315577 4.075197 0.0 80.0 I3 node 1 262654 10.177086 9.383763 0.0 268.0 I3 node 2 262654 8.877655 3.692493 0.0 62.0 I3 node 3 262654 8.600388 3.658107 0.0 162.0 S2 node 0 262654 8.472055 3.694394 0.0 385.0 S2 node 1 262654 8.936990 4.249659 0.0 71.0 S2 node 2 262654 9.077359 3.991133 0.0 111.0 S2 node 3 262654 8.699813 3.642577 0.0 427.0 S3 node 0 262654 11.495450 5.637009 0.0 110.0 S3 node 1 262654 12.833866 4.796765 0.0 78.0 S3 node 2 262654 12.316996 4.037231 0.0 45.0 S3 node 3 262654 11.212154 3.806680 0.0 34.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1565.61 2098.57 0.0 94328 I2 node 0 262654 1294.843288 250.561201 0.0 6558.0 I2 node 1 262654 1366.920976 336.740991 0.0 27574.0 I2 node 2 262654 1401.062500 303.485019 0.0 8901.0 I2 node 3 262654 1396.532862 356.981339 0.0 27689.0 I3 node 0 262654 1463.799925 357.041000 0.0 6497.0 I3 node 1 262654 1536.369850 1161.184956 0.0 29880.0 I3 node 2 262654 1335.803459 242.982109 0.0 6378.0 I3 node 3 262654 1321.660294 258.692231 0.0 23614.0 S2 node 0 262654 1871.520431 260.231769 976.0 20149.0 S2 node 1 262654 1990.655268 429.001747 1008.0 10954.0 S2 node 2 262654 2209.362565 417.600931 1312.0 15873.0 S2 node 3 262654 2138.386165 307.351852 1253.0 33778.0 S3 node 0 262654 3254.924043 1636.258029 1349.0 13032.0 S3 node 1 262654 4436.088021 1952.284235 0.0 13526.0 S3 node 2 262654 3361.192846 904.907256 1275.0 8395.0 S3 node 3 262654 2590.032909 415.489850 1447.0 9432.0
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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
Dec 2011 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -105.85 | +/-10.58 C |
| Mean Width: | |
| 0.63 | +/- 0.50 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_12_2011.fits 16777216 0.004 0.209 0.0 13.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_12_2011.fits 16777216 3.605 4.415 0.0 292.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_12_2011.fits 16777216 0.019 0.157 0.0 13.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_12_2011.fits 16777216 13.821 22.964 0.0 1628.0
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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
Fid Light Drift
Fid light positions on ACA drift with time. The drift trends of Fid light 2 with ACIS-I and ACIS-S configurations are shown below.
The top panel shows Fid light 2 drift in ACENT I (app. along with -Y axis), and the
bottom panel shows that in ACENT J (app. along with Z axis). The unit is a pixel, and
one pixel is approximately 0.5 arcsec. The slope listed at the top right corner is
the change in a position per year (arcsec/yr). The vertical line on DOM = 1411 (Jun 1, 2003)
indicates a transition date of use of IRU-1 to IRU-2.
See also Tom Aldcroft's updated page:
https://cxc.cfa.harvard.edu/mta/ASPECT/fid_drift
Fid 2 (ACIS-I)
Fid 2 (ACIS-S)
Fid 8 (HRC-I)
Fid 12 (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 Dec 2011
Sun Spot History
Trending
Quarterly Trends
- DEAHK Temperature
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| DEAHK1 | 17.95 | 6.17 | 1.023e+01 | -1.982e+02 | C | DPA Thermistor 1 - BEP PC Board |
| DEAHK2 | 16.14 | 6.38 | 1.090e+01 | -1.976e+02 | C | DPA Thermistor 2 - BEP Oscillator |
| DEAHK3 | 16.82 | 7.83 | 8.422e+00 | -2.860e+02 | C | DPA Thermistor 3 - FEP 0 Mongoose |
| DEAHK4 | 15.88 | 7.15 | 9.527e+00 | -2.749e+02 | C | DPA Thermistor 4 - FEP 0 PC Board |
| DEAHK5 | 17.22 | 7.65 | 9.626e+00 | -2.804e+02 | C | DPA Thermistor 5 - FEP 0 ACTEL |
| DEAHK6 | 17.12 | 7.50 | 1.042e+01 | -2.787e+02 | C | DPA Thermistor 6 - FEP 0 RAM |
| DEAHK7 | 14.42 | 7.12 | 1.114e+01 | -2.640e+02 | C | DPA Thermistor 7 - FEP 0 Frame Buf. |
| DEAHK8 | 22.46 | 7.33 | 1.413e+01 | -3.451e+02 | C | DPA Thermistor 8 - FEP 1 Mongoose |
| DEAHK9 | 19.51 | 7.13 | 1.348e+01 | -3.320e+02 | C | DPA Thermistor 9 - FEP 1 PC Board |
| DEAHK10 | 21.87 | 7.43 | 1.408e+01 | -3.376e+02 | C | DPA Thermistor 10- FEP 1 ACTEL |
| DEAHK11 | 20.84 | 7.48 | 1.416e+01 | -3.462e+02 | C | DPA Thermistor 11- FEP 1 RAM |
| DEAHK12 | 16.03 | 7.30 | 1.335e+01 | -3.035e+02 | C | DPA Thermistor 12- FEP 1 Frame Buf. |
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- PCAD Tperature
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AACBPPT | 302.68 | 0.93 | 6.000e+00 | -4.264e+01 | K | AC BASEPLATE TEMP (PRIME) |
| AACBPRT | 297.55 | 0.95 | 5.797e+00 | -2.963e+01 | K | AC BASEPLATE TEMP (RDNT) |
| AACCCDPT | 254.25 | 0.83 | 4.012e+00 | 3.171e+01 | K | AC CCD TEMP (PRI) |
| AACCCDRT | 297.41 | 1.07 | 6.509e+00 | -3.844e+01 | K | AC CCD TEMP (RDNT) |
| AACH1T | 294.53 | 1.03 | 6.552e+00 | -1.277e+01 | K | AC HOUSING TEMP (ACH1) |
| AACH2T | 294.57 | 1.03 | 6.575e+00 | -1.183e+01 | K | AC HOUSING TEMP (ACH2) |
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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 | |