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_aug12 6004901 1640.621 2171.551 0.0 96754 I2 node 0 262654 4.600853 2.433777 0.0 35.0 I2 node 1 262654 4.810318 2.637044 0.0 148.0 I2 node 2 262654 4.778252 2.469408 0.0 36.0 I2 node 3 262654 4.716278 2.525573 0.0 30.0 I3 node 0 262654 5.462379 2.704092 0.0 28.0 I3 node 1 262654 5.807518 5.176855 0.0 279.0 I3 node 2 262654 5.377910 2.612341 0.0 34.0 I3 node 3 262654 5.375172 2.654321 0.0 84.0 S2 node 0 262654 11.220665 4.594226 0.0 113.0 S2 node 1 262654 11.541826 4.801069 0.0 81.0 S2 node 2 262654 12.015568 5.775277 0.0 473.0 S2 node 3 262654 11.769659 4.202388 0.0 412.0 S3 node 0 262654 15.153271 6.076061 1.0 198.0 S3 node 1 262654 16.521394 5.316630 0.0 110.0 S3 node 2 262654 15.677102 4.336211 1.0 59.0 S3 node 3 262654 14.272152 4.241292 1.0 141.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1640.621 2171.551 0.0 96754 I2 node 0 262654 1337.523605 258.213559 0.0 6871.0 I2 node 1 262654 1411.895310 349.053457 0.0 29034.0 I2 node 2 262654 1445.498615 312.101265 0.0 8957.0 I2 node 3 262654 1441.366009 368.052434 0.0 27740.0 I3 node 0 262654 1511.161396 367.792637 0.0 6577.0 I3 node 1 262654 1587.188908 1200.995053 0.0 30830.0 I3 node 2 262654 1381.484774 251.852898 0.0 6633.0 I3 node 3 262654 1365.962227 267.282873 0.0 24257.0 S2 node 0 262654 1933.536232 273.252312 1006.0 20865.0 S2 node 1 262654 2055.529225 444.860228 1040.0 11390.0 S2 node 2 262654 2278.470994 429.927744 1352.0 16683.0 S2 node 3 262654 2207.429584 314.892079 1287.0 35635.0 S3 node 0 262654 3367.407870 1666.649011 1407.0 13135.0 S3 node 1 262654 4570.090628 1981.345048 0.0 13640.0 S3 node 2 262654 3466.519612 927.556805 1334.0 8646.0 S3 node 3 262654 2669.551315 419.446570 1499.0 9619.0
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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
Aug 2012 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -116.33 | +/- 1.72 C |
| Mean Width: | |
| 0.65 | +/- 0.87 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.
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_2012.fits 16777216 0.010 0.1371 0.0 10.0
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_08_2012.fits 16777216 3.887 4.736 0.0 292.0
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_08_2012.fits 16777216 14.175 23.882 0.0 1634.0
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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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HRMA Focus
ACIS HETG
ACIS LETG
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 Jul 2012
Sun Spot History
Trending
Quarterly Trends
- EPHIN Temperature and Voltage
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 5EPHINT | 321.57 | 5.51 | 2.014e+01 | 2.006e+02 | K | EPHIN TEMP |
| HKEBOXTEMP | 326.28 | 5.68 | 2.105e+01 | 2.267e+02 | K | EPHIN HOUSEKEEPING EBOX: TEMPERATURE (5EHSE300) |
| TEIO | 319.38 | 19.63 | 3.979e+01 | 9.148e+02 | K | EPHIN ELECTRONICS HOUSING TEMP |
| TEPHIN | 321.63 | 5.74 | 2.103e+01 | 2.568e+02 | K | EPHIN SENSOR HOUSING TEMP |
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- HRMA Thermal
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| 4RT568T | 289.35 | 0.84 | 3.704e+00 | 6.803e+01 | K | RT 568 - HRMA TEMP |
| 4RT575T | 291.07 | 1.18 | 5.295e+00 | 8.640e+01 | K | RT 575 - OB CONE TEMP |
| 4RT576T | 284.85 | 0.87 | 4.167e+00 | 6.054e+01 | K | RT 576 - OB CONE TEMP |
| 4RT577T | 291.28 | 2.14 | 6.108e+00 | 1.635e+02 | K | RT 577 - OB CONE TEMP |
| 4RT578T | 289.13 | 1.80 | 5.148e+00 | 1.441e+02 | K | RT 578 - OB CONE 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 |
| 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 | |||||