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.
Please check more detail plots at Telemetered Photon Dose Trend page.
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Statistics: # IMAGE NPIX MEAN RMS MIN MAX ACIS_feb16 6004901 6.266 9.246 0.0 1524 I2 node 0 262654 6.114971 2.911421 0.0 56.0 I2 node 1 262654 6.440065 3.799200 0.0 1003.0 I2 node 2 262654 6.303885 2.947435 0.0 56.0 I2 node 3 262654 6.360905 3.092194 0.0 67.0 I3 node 0 262654 6.805602 3.146064 0.0 64.0 I3 node 1 262654 7.063983 6.399694 0.0 146.0 I3 node 2 262654 6.623959 3.213572 0.0 67.0 I3 node 3 262654 6.542113 3.262520 0.0 558.0 S2 node 0 262654 8.281101 4.518328 0.0 1506.0 S2 node 1 262654 8.511932 4.977077 0.0 1524.0 S2 node 2 262654 8.679010 4.630241 0.0 1306.0 S2 node 3 262654 8.429791 3.753327 0.0 563.0 S3 node 0 262654 12.443700 16.648700 0.0 267.0 S3 node 1 262654 10.969215 5.594883 0.0 92.0 S3 node 2 262654 10.281074 4.288367 0.0 41.0 S3 node 3 262654 9.392001 4.115334 0.0 38.0
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Statistics: IMAGE NPIX MEAN RMS MIN MAX ACIS_total 6004901 1990.193 2598.075 0.0 114141 I2 node 0 262654 1689.472630 324.734559 339.0 9252.0 I2 node 1 262654 1779.865456 448.062199 363.0 45704.0 I2 node 2 262654 6.303885 2.947435 0.0 56.0 I2 node 3 262654 1810.710034 457.207124 347.0 28202.0 I3 node 0 262654 1906.436520 456.586505 339.0 7440.0 I3 node 1 262654 1996.725439 1507.432373 343.0 37646.0 I3 node 2 262654 1746.079019 315.259998 332.0 9297.0 I3 node 3 262654 6.542113 3.262520 0.0 558.0 S2 node 0 262654 2324.632215 338.936070 1240.0 21393.0 S2 node 1 262654 8.511932 4.977077 0.0 1524.0 S2 node 2 262654 2725.325984 520.028544 1661.0 27346.0 S2 node 3 262654 2662.575611 376.022866 1559.0 46321.0 S3 node 0 262654 4131.860126 1841.258627 1710.0 13847.0 S3 node 1 262654 5330.641616 2137.187106 0.0 14314.0 S3 node 2 262654 4108.620565 1044.270248 1704.0 9918.0 S3 node 3 262654 3174.156124 480.607516 1815.0 10729.0
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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
Imaging CCDs
Spectral CCDs
Backside CCDs
Focal Plane Temperature
Feb 2016 Focal Temperature
| The Mean (max) FPT: | |
|---|---|
| -114.13 | +/- 2.18 C |
| Mean Width: | |
| 0.93 | +/- 0.44 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.
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCI_08_1999_02_2016.fits 16777216 4.380 4.960 0.0 292.0
No Data
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IMAGE NPIX MEAN STDDEV MIN MAX
HRCS_08_1999_02_2016.fits 16777216 15.900 28.368 0.0 1695.0
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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
Plots below show various characteristics of detected imaging sources. Standard level 2 data products (*src2.fits) are used. Only observations with focus (sim_x) within 0.01 mm of nominal value for given SI configuration are used. Sources are also filtered for strength (SNR > 15).
For individual detectors, please go to MTA SRC2 Monitoring page.
Source Sky Position
PSF vs Time
Source Ellipse Roundness
80% Encircled Energy Radius
Signal-to-Noise Ratio
Rotation
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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
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 Feb 2016
Sun Spot History
Trending
Quarterly Trends
- Spacecraft Electronics
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| ELBI | 56.31 | 1.26 | -2.287e+00 | -2.549e+01 | AMP | LOAD BUS CURRENT |
| ELBV | 28.25 | 0.12 | 3.832e-01 | 1.614e+01 | V | LOAD BUS VOLTAGE |
| OHRMAPWR | 50.93 | 1.47 | -5.846e+00 | 2.320e+01 | W | HRMA COMPUTED TOTAL POWER |
| OOBAPWR | 46.98 | 1.83 | -3.146e+00 | -1.220e+01 | W | OBA COMPUTED TOTAL POWER |
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- OBA Heater
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| OOBTHR04 | 294.45 | 1.05 | 5.298e+00 | -2.273e+01 | K | RT 27: HRMA STRUT |
| OOBTHR12 | 291.93 | 1.59 | 7.143e+00 | -6.610e+01 | K | RT 35: OBA CONE |
| OOBTHR26 | 294.85 | 2.73 | 9.472e+00 | -1.336e+02 | K | RT 48: OBA CONE |
| OOBTHR38 | 283.17 | 1.337e-02 | 3.475e-02 | 7.015e-01 | K | RT 60: TFTE CONE |
| OOBTHR44 | 293.99 | 1.61 | 6.914e+00 | -4.602e+01 | K | RT 66: TFTE COVER |
| OOBTHR50 | 288.82 | 1.65 | 7.587e+00 | -6.063e+01 | K | RT 76: S/C STRUT |
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- HRMA Heater
| Previous Quarter | ||||||
| MSID | MEAN | RMS | DELTA/YR | DELTA/YR/YR | UNITS | DESCRIPTION |
| OHRTHR03 | 295.24 | 1.000e-03 | -5.252e-04 | 1.348e-02 | K | RT 5: HRMA FORWARD APERTURE PLATE |
| OHRTHR09 | 294.53 | 2.785e-02 | 1.182e-01 | -2.302e+00 | K | RT 105: HRMA CAP |
| OHRTHR17 | 294.39 | 3.654e-02 | 1.497e-01 | -2.884e+00 | K | RT 125: HSA OUTER CYNLINDER |
| OHRTHR24 | 294.73 | 1.088e-02 | -2.328e-02 | 5.245e-01 | K | RT 12: HRMA AFT HEATER PLATE |
| OHRTHR38 | 294.69 | 0.68 | 1.757e+00 | -3.030e+01 | K | RT 120: HRMA AFT COLLIMATOR OUTER CYLINDER |
| OHRTHR52 | 294.38 | 3.294e-02 | 1.326e-01 | -2.601e+00 | K | RT 100: HRMA CAP |
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Envelope Trending
OBA Fw Bulkhead
PCAD FTS Grad
Spacecraft Motions
TSC and FA Cummulative Moter Distance
HETG and LETG Cummulative Insertion Counts
HETG/LETG Insertion/Retraction Angle
Reaction Wheel Rotations
Links to Past Monthly Reports
| Year | Month | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2016 | Jan | |||||||||||
| 2015 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2014 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2013 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 2012 | 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 |
| 2010 | 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 |
| 2008 | 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 |
| 2006 | 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 |
| 2004 | 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 |
| 2002 | 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 |
| 2000 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
| 1999 | Jul | Aug | Sep | Oct | Nov | Dec | ||||||