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_apr11 6004901 10.71 44.82 0.0 1131 I2 node 0 262654 6.613098 3.040374 0.0 57.0 I2 node 1 262654 7.045061 3.476721 0.0 449.0 I2 node 2 262654 6.906479 3.080584 0.0 52.0 I2 node 3 262654 6.905766 3.287372 0.0 63.0 I3 node 0 262654 6.753833 3.138544 0.0 66.0 I3 node 1 262654 7.227753 7.268832 0.0 264.0 I3 node 2 262654 6.644070 3.008157 0.0 42.0 I3 node 3 262654 6.596062 3.656425 0.0 998.0 S2 node 0 262654 9.154090 4.025408 0.0 803.0 S2 node 1 262654 9.551552 4.494819 0.0 79.0 S2 node 2 262654 9.829151 4.143875 0.0 99.0 S2 node 3 262654 9.335478 3.917335 0.0 605.0 S3 node 0 262654 70.588798 171.819901 0.0 1131.0 S3 node 1 262654 40.041713 100.285467 0.0 998.0 S3 node 2 262654 14.879209 5.245671 0.0 58.0 S3 node 3 262654 12.653210 4.118767 0.0 42.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1504.62 2025.02 0.0 91062 I2 node 0 262654 1233.025326 237.088595 0.0 6045.0 I2 node 1 262654 1301.234886 317.140595 0.0 24710.0 I2 node 2 262654 1336.788845 290.199793 0.0 8810.0 I2 node 3 262654 1332.298762 340.414435 0.0 27621.0 I3 node 0 262654 1399.214096 342.938473 0.0 6341.0 I3 node 1 262654 1467.133972 1099.561187 0.0 28342.0 I3 node 2 262654 1273.059160 230.118899 0.0 5949.0 I3 node 3 262654 1259.452118 245.454861 0.0 22640.0 S2 node 0 262654 1799.362615 249.119183 923.0 20088.0 S2 node 1 262654 1913.734146 409.335868 954.0 10498.0 S2 node 2 262654 2122.009735 400.271183 1231.0 14967.0 S2 node 3 262654 2049.637493 295.465790 1182.0 31511.0 S3 node 0 262654 3120.598315 1596.336128 1273.0 12890.0 S3 node 1 262654 4325.655030 1935.511315 0.0 13392.0 S3 node 2 262654 3260.276126 896.819560 1205.0 8199.0 S3 node 3 262654 2498.140737 402.671568 1369.0 9235.0
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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
Apr 2011 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -114.70 | +/- 4.69 C |
| Mean Width: | |
| 0.65 | +/- 0.53 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 and Sun Angle, Earth Engle, 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.
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_04_2011.fits 16777216 0.093 0.115 0.0 13.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_04_2011.fits 16777216 3.524 4.330 0.0 292.0
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_04_2011.fits 16777216 13.439 22.435 0.0 1622.0
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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. (NOTE: the figures are not updated from Mar 2009 due to a system problem.)
PCAD
ACA Trending
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 Apr 2011
Sun Spot History
SIM
SIM Shift and Twist
SIM Shift and Twist Trend The following plots show trends of SIM shifts (dy and dz) and twist (dtheta). All quantities are directly taken from pcaf*_asol1.fits files. The units are mm for dy and dz, and degree for dtheta. We fit three lines separated before and after (Days of Mission)= 1400 (May 21, 2003), and 2700 (Dec 11, 2006). The unit of slopes are mm per day or degree per day.
The sudden shift around DOM = 1400 and 2700 are due to fid light drift (see a memo by Aldcroft fiducial light drift). On the dtheta plot, two tracks are clearly observed. The track around 0.01 is due to HRC-I, and all others are clustered around -0.002. For more detail, please see SIM Shift and Twist Trend page
Trending
Quarterly Trends
- PCAD Temperature
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| AACH1T | 294.26 | 0.71 | -1.979e+00 | 8.719e+01 | K | AC HOUSING TEMP (ACH1) |
| AACH2T | 294.31 | 0.72 | -2.049e+00 | 8.760e+01 | K | AC HOUSING TEMP (ACH2) |
| AAOTH2MT | 293.82 | 0.70 | -1.991e+00 | 8.531e+01 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP (HRMA) |
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- Spacecraft Main Temperature
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| TCYLAFT1 | 296.15 | 3.99 | -1.621e+01 | 7.243e+02 | K | CNT CYL TEMP:16-IN FWD OF SC-TS FIT-1 |
| TCYLAFT6 | 295.99 | 4.54 | -1.767e+01 | 8.543e+02 | K | CNT CYL TEMP:16-IN FWD OF SC-TS FIT-6 |
| TSAMYT | 320.65 | 1.23 | -1.360e+01 | -2.303e+01 | K | -Y WING SOLAR ARRAY TEMP |
| TSAPYT | 320.17 | 1.18 | -1.336e+01 | -7.557e+00 | K | +Y WING SOLAR ARRAY TEMP |
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- Spacecraft Electric
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| ELBI | 57.67 | 1.40 | 3.066e+00 | -1.649e+02 | AMP | LOAD BUS CURRENT |
| ELBV | 29.42 | 0.17 | 1.710e+00 | 1.396e+01 | V | LOAD BUS VOLTAGE |
| OOBAPWR | 51.16 | 3.11 | 4.200e+00 | -5.757e+02 | W | OBA COMPUTED TOTAL POWER |
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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 | |||||||||