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_feb10 6004901 10.601 15.081 0.0 719.0 I2 node 0 262654 12.961449 6.713375 0.0 87.0 I2 node 1 262654 12.152603 5.256604 0.0 247.0 I2 node 2 262654 12.198750 5.217775 0.0 74.0 I2 node 3 262654 14.708496 9.314029 0.0 115.0 I3 node 0 262654 12.114765 5.286190 0.0 63.0 I3 node 1 262654 12.089832 12.395082 0.0 266.0 I3 node 2 262654 10.926661 4.371756 0.0 571.0 I3 node 3 262654 11.578667 5.094143 0.0 172.0 S2 node 0 262654 13.414135 4.314562 0.0 111.0 S2 node 1 262654 15.150677 5.655553 1.0 117.0 S2 node 2 262654 17.300793 6.160705 1.0 163.0 S2 node 3 262654 13.425299 4.310485 0.0 719.0 S3 node 0 262654 13.465361 6.123207 0.0 124.0 S3 node 1 262654 14.349132 4.803694 0.0 94.0 S3 node 2 262654 15.866169 4.817228 2.0 51.0 S3 node 3 262654 19.707396 8.119727 1.0 67.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1364.77 1841.68 0.0 82953.0 I2 node 0 262654 1099.983360 208.462480 0.0 5168.0 I2 node 1 262654 1158.440748 277.625870 0.0 20351.0 I2 node 2 262654 1197.314789 261.481100 0.0 8670.0 I2 node 3 262654 1193.071246 304.270277 0.0 27482.0 I3 node 0 262654 1254.997260 309.485347 0.0 6050.0 I3 node 1 262654 1315.531017 959.793496 0.0 24908.0 I3 node 2 262654 1135.957314 201.854392 0.0 5129.0 I3 node 3 262654 1122.068829 215.269038 0.0 20493.0 S2 node 0 262654 1633.712040 220.441324 817.0 19951.0 S2 node 1 262654 1736.197631 363.589140 851.0 9297.0 S2 node 2 262654 1925.927175 358.827507 1099.0 13213.0 S2 node 3 262654 1854.325260 256.106737 1072.0 26908.0 S3 node 0 262654 2782.805917 1335.540156 1151.0 11268.0 S3 node 1 262654 4027.500385 1824.870754 0.0 12093.0 S3 node 2 262654 3017.250050 853.681619 1065.0 7537.0 S3 node 3 262654 2297.774311 371.301662 1224.0 8758.0
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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
February 2010 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -105.79 | +/- 5.74 C |
| Mean Width: | |
| 0.45 | +/- 0.34 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_02_2010.fits 16777216 0.023 0.154 0.0 5.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_02_2010.fits 16777216 3.157 4.005 0.0 292.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_02_2010.fits 16777216 0.046 0.578 0.0 88.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_02_2010.fits 16777216 12.880 21.172 0.0 1585.0
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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
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 Jan 2010
Sun Spot History
Trending
Quarterly Trends
- Ephin Temperature/Voltage
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 5EPHINT | 316.30 | 3.42 | 5.463e+00 | -3.367e+02 | K | EPHIN TEMP |
| HKEBOXTEMP | 320.86 | 3.51 | 6.363e+00 | -3.626e+02 | K | EPHIN HOUSEKEEPING EBOX: TEMPERATURE (5EHSE300) |
| TEPHIN | 316.25 | 3.63 | 6.961e+00 | -3.645e+02 | K | EPHIN SENSOR HOUSING TEMP |
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- SIM Temperature
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 3TSMXSPT | 265.96 | 24.79 | -2.511e+01 | -2.294e-12 | K | -X TURTLE SHELL NR ACIS SS |
| PSUTEMP | 312.10 | 0.79 | 1.439e+00 | -1.228e-13 | (3FAPSAT) | SEA power supply temperature |
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- Spacecraft Main Temperature
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| TCYLAFT1 | 295.42 | 3.67 | 1.498e+01 | -2.476e+02 | K | CNT CYL TEMP:16-IN FWD OF SC-TS FIT-1 |
| TCYLAFT6 | 295.21 | 4.17 | 1.632e+01 | -3.697e+02 | K | CNT CYL TEMP:16-IN FWD OF SC-TS FIT-6 |
| TSAMYT | 322.00 | 0.74 | -2.628e+00 | -9.125e+01 | K | -Y WING SOLAR ARRAY TEMP |
| TSAPYT | 321.54 | 0.70 | -2.715e+00 | -8.471e+01 | K | +Y WING SOLAR ARRAY TEMP |
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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 |
| 2009 | Jan | |||||||||||