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_apr10 6004901 9.776 13.613 0.0 675.0 I2 node 0 262654 8.913223 3.671745 0.0 69.0 I2 node 1 262654 9.290368 4.057775 0.0 202.0 I2 node 2 262654 9.144585 3.673903 0.0 67.0 I2 node 3 262654 9.018051 3.929339 0.0 54.0 I3 node 0 262654 9.526995 3.823659 0.0 50.0 I3 node 1 262654 10.216515 10.428905 0.0 246.0 I3 node 2 262654 9.451168 3.743185 0.0 70.0 I3 node 3 262654 9.879059 4.179897 0.0 150.0 S2 node 0 262654 13.238634 4.843055 0.0 392.0 S2 node 1 262654 14.514865 5.962761 0.0 105.0 S2 node 2 262654 15.222557 5.761693 0.0 138.0 S2 node 3 262654 13.825322 4.685284 0.0 351.0 S3 node 0 262654 20.455090 11.706047 0.0 258.0 S3 node 1 262654 18.654264 7.891463 0.0 89.0 S3 node 2 262654 16.893214 5.944497 1.0 55.0 S3 node 3 262654 15.778245 5.637366 0.0 53.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1385.19 1867.59 0.0 84264.0 I2 node 0 262654 1120.519703 212.767805 0.0 5313.0 I2 node 1 262654 1180.770446 283.726743 0.0 20889.0 I2 node 2 262654 1218.550571 265.611905 0.0 8688.0 I2 node 3 262654 1213.887502 309.291852 0.0 27507.0 I3 node 0 262654 1276.019574 313.618939 0.0 6082.0 I3 node 1 262654 1338.065331 981.120487 0.0 25458.0 I3 node 2 262654 1156.935407 205.826021 0.0 5250.0 I3 node 3 262654 1145.084377 221.320723 0.0 20820.0 S2 node 0 262654 1660.864181 225.191580 839.0 19973.0 S2 node 1 262654 1766.185745 370.943411 866.0 9489.0 S2 node 2 262654 1957.880434 364.399883 1120.0 13492.0 S2 node 3 262654 1884.242114 258.550709 1095.0 27618.0 S3 node 0 262654 2818.464622 1338.841786 1163.0 11317.0 S3 node 1 262654 4063.535574 1830.006299 0.0 12129.0 S3 node 2 262654 3050.645358 856.847274 1086.0 7646.0 S3 node 3 262654 2328.163920 374.426736 1240.0 8831.0
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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
April 2010 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -103.65 | +/- 27.29 C |
| Mean Width: | |
| 0.44 | +/- 0.29 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_2010.fits 16777216 0.057 0.261 0.0 7.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_04_2010.fits 16777216 3.230 4.066 0.0 292.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_04_2010.fits 16777216 0.063 0.595 0.0 97.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_04_2010.fits 16777216 13.052 21.953 0.0 1619.0
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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
Gratings Resolving Power
We plot E/dE vs. E for fits to detected lines with fwhm_error/fwhm less than 0.15 for the plus and minus arms of HEG, MEG, and LEG. Also shown are conservative (dotted line) and optimistic (dashed line) pre-launch resolving power expectations.
We have selected only calibration observations of Capella, HR1099, and Sigma Gem. See MIT technotes for a parallel analysis.
| Plot symbol indicates dispersion arm: | Color indicates observation date: |
Minus side = cross (x) |
2002-2004 blue 2005-2006 yellow 2007-2009 orange |
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 2010
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 | 293.12 | 0.45 | 3.384e-01 | -2.110e+01 | K | AC HOUSING TEMP (ACH1) |
| AACH2T | 293.16 | 0.46 | 3.133e-01 | -2.125e+01 | K | AC HOUSING TEMP (ACH2) |
| AAOTH2MT | 292.69 | 0.45 | 2.860e-01 | -1.792e+01 | K | AC OPT TEL ASSY SECONDARY MIRROR TEMP (HRMA) |
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- MUPS
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| PLINE01T | 289.10 | 2.29 | -2.810e+00 | -1.979e+02 | K | PROP LINE TEMP 01 |
| PLINE02T | 314.91 | 10.13 | -1.240e+01 | -1.676e+02 | K | PROP LINE TEMP 02 |
| PLINE03T | 314.04 | 12.69 | -1.571e+01 | -1.758e+02 | K | PROP LINE TEMP 03 |
| PLINE04T | 299.57 | 11.25 | -1.374e+01 | -3.830e+02 | K | PROP LINE TEMP 04 |
| PLINE05T | 298.22 | 7.71 | -1.306e+01 | -1.645e+02 | K | PROP LINE TEMP 05 |
| PLINE06T | 290.05 | 6.13 | -9.959e+00 | -1.777e+02 | K | PROP LINE TEMP 06 |
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- Spacecraft Main Temperature
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| TCYLAFT1 | 295.92 | 3.84 | -4.944e+00 | -2.090e+01 | K | CNT CYL TEMP:16-IN FWD OF SC-TS FIT-1 |
| TCYLAFT6 | 295.73 | 4.19 | -3.941e+00 | 9.775e+01 | K | CNT CYL TEMP:16-IN FWD OF SC-TS FIT-6 |
| TSAMYT | 320.46 | 1.12 | -1.371e+01 | -1.350e+01 | K | -Y WING SOLAR ARRAY TEMP |
| TSAPYT | 320.01 | 1.09 | -1.365e+01 | -1.765e+01 | K | +Y WING SOLAR ARRAY TEMP |
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- Spacecraft Electric
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| ELBI | 57.61 | 1.48 | 7.427e-01 | 5.491e+00 | AMP | LOAD BUS CURRENT |
| ELBV | 29.53 | 0.18 | 2.019e+00 | 1.747e+00 | V | LOAD BUS VOLTAGE |
| OHRMAPWR | 60.03 | 1.28 | -9.032e+00 | 1.093e+00 | W | HRMA COMPUTED TOTAL POWER |
| OOBAPWR | 53.38 | 2.99 | -1.093e+01 | -3.277e+00 | 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 | |||||||||