- M&TA MONTHLY REPORT -

1. Configuration
2. ACIS
   1. Dose
   2. CTI
   3. Focal Plane Temperature
   4. Bad Pixels
   5. Background
3. HRC - Dose
4. Gratings - Focus
5. PCAD
   1. ACA Trending
   2. Gyro bias drift
   3. Science Instrument Positional Change Monitoring
6. Radiation Zone Timing
7. Quarterly Trends
8. Spacecraft Motions

Configuration/Radiation Overview for September 2008

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.
  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.

  • SEP registered-photon-map in fits
    

    Statistics:
    # IMAGE     NPIX        MEAN           RMS              MIN     MAX
    ACIS_sep08 6004901      8.761          22.74            0.0     31400.
    
     I2 node 0  262654      10.368965       3.922686        0.0      56.0
     I2 node 1  262654      10.991176       4.413517        0.0     205.0
     I2 node 2  262654      10.936028       4.031769        0.0      80.0
     I2 node 3  262654      10.731527       4.270081        0.0      60.0
    
     I3 node 0  262654      10.722087       3.996462        0.0      55.0
     I3 node 1  262654      11.414013       10.939912       0.0     303.0
     I3 node 2  262654      10.407017       3.834669        0.0      83.0
     I3 node 3  262654      10.492481       8.733230        0.0     4003.0
    
     I2 node 0  262654      13.528726       36.486741       0.0     18452.0
     I2 node 1  262654      13.869316       5.236127        0.0     120.0
     I2 node 2  262654      14.219194       4.849720        0.0     127.0
     I2 node 3  262654      13.532990       4.387328        0.0     582.0
    
     I3 node 0  262654      10.222093       5.612609        0.0     275.0
     I3 node 1  262654      10.934606       3.796880        0.0      68.0
     I3 node 2  262654      10.865407       3.468082        0.0      38.0
     I3 node 3  262654      10.197895       3.423042        0.0      46.0
    
    

  • Jul 1999 - Sep 2008 registered-photon-map in fits
    

    
    Statistics:
     IMAGE        NPIX      MEAN          RMS              MIN    MAX
    ACIS_total  6004901    1185.92          1624.72         0.0    72308.0
    
     I2 node 0  262654      912.742447      163.654717      0.0     4108.0
     I2 node 1  262654      965.228287      223.784737      0.0     15237.0
     I2 node 2  262654      980.055576      189.264999      0.0     8360.0
     I2 node 3  262654      981.786904      240.734613      0.0     27220.0
    
     I3 node 0  262654      1034.601931     251.454576      0.0     5511.0
     I3 node 1  262654      1073.394257     770.009575      0.0     20453.0
     I3 node 2  262654      954.249674      162.691857      0.0     4079.0
     I3 node 3  262654      942.555164      174.761211      0.0     17519.0
    
     I2 node 0  262654      1411.895021     183.934708      692.0   19755.0
     I2 node 1  262654      1498.142632     306.035874      714.0   7756.0
     I2 node 2  262654      1673.250620     313.984620      939.0   11029.0
     I2 node 3  262654      1617.738634     237.359186      924.0   21007.0
    
     I3 node 0  262654      2504.781817     1273.326687     1003.0  10896.0
     I3 node 1  262654      3716.528389     1782.327015     0.0     11800.0
     I3 node 2  262654      2716.240862     807.011450      904.0   6111.0
     I3 node 3  262654      2036.226875     328.298175      1060.0  8111.0
    
    

  • SEP 2008 dose PNG image
    
  • SEP I3 dose PNG image
    
  • SEP S3 dose PNG image
    
  • TOTAL JUL 1999 - SEP 2008 dose PNG image
    
  • TOTAL I3 dose PNG image
    
  • TOTAL S3 dose PNG image
    
  
  
• Integrated Exposure Maps of Last 12 Months
  

  Jun 2008	Mar 2008	Dec 2007	Sep 2007

  
  
  
• 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

    
         The Mean (max) FPT: -119.08 C    std dev: 1.98
                 mean width:    0.34 days std dev: 0.26
  

  
  
  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.
  
  
  

  The following is a plot of focal plane temperature and sun angle, earth 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)
  

• Acis Count Rate Plot This monitors the ACIS count Rate vs. EPHIN count Rate.
  No sources or CTI observations are removed. For daily updates see: Ephin/Acis Info




• Science instrument background rates
  This page shows scientific instrument background data based on Acis observations. A source region file is generated using get_srcregions and then the input event file is filtered using the regions in that file to remove the sources.
  
  

  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

  
  
  
  
  

  The following three plots show trends of SIB from year 2000. CCDs shown here are CCD3, CCD5, and CCD7. Fitted lines are linear fit after eliminating extreme outliers. For >10 keV plots, 2 lines are fit. One is with a 13 keV filter, and another without.

  
  

TOP

HRC

DOSE of central 4K pore-pairs



• SEP HRC-I dose fits image

          IMAGE                NPIX      MEAN    STDDEV      MIN       MAX
  HRCI_09_2008.fits          16777216   0.032    0.189       0.0       10.0 
  

  
  
• SEP 1999 - SEP 2008 HRC-I dose fits image

          IMAGE                NPIX      MEAN    STDDEV      MIN       MAX
  HRCI_09_1999_08_2008.fits  16777216   2.660    3.594       0.0       290.0
  

  
  
• SEP HRC-S dose fits image

          IMAGE                NPIX      MEAN    STDDEV      MIN       MAX
  HRCS_09_2008.fits          16777216   0.235    0.595       0.0       20.0
  

  
  
• SEP 1999 - SEP 2008 HRC-S dose fits image

          IMAGE                NPIX     MEAN      STDDEV      MIN      MAX
  HRCS_09_1999_08_2008.fits  16777216  9.224      17.453      0.0      1551.0
  

  
  
• SEP HRC-I dose PNG image
  
• AUG 1999 - SEP 2008 HRC-I dose PNG image
  
• SEP HRC-S dose PNG image
  
• AUG 1999 - SEP 2008 HRC-S dose PNG image
  
  
  See Maximum Dose Trends
  

  We display a max dose trend plot corrected for events that "pile-up" in the center of the taps due to bad position information.

  
  
• Integrated Exposure Maps of Last 12 Months: HRCI
  

  Jun 2008	Mar 2008	Dec 2007	Sep 2007

  
  
• Integrated Exposure Maps of Last 12 Months: HRCS
  t>hhSep 2007

  Jun 2008	Mar 2008	Dec 2007

  
  TOP

• 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.
  
  
  

ACA Trending - Entire Period
ACA Trending - September 2008

ACIS-S and HRC Celestial Location 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).

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).



Sep 2008 Timing Plots       Entire Mission Timing Plots

Quarterly Trends

• HRC Temperature

  Previous Quarter
  MSID	MEAN	RMS	DELTA/YR	DELTA/YR/YR	UNITS	DESCRIPTION
  2CEAHVPT	298.65	2.70	2.841e+01	-3.431e+02	K	CEA RADIATOR TEMPERATURE AT CENTER
  2CHTRPZT	294.87	2.59	2.743e+01	-3.152e+02	K	CENTRAL ELECTRONICS BOX TEMP
  2CONDMXT	290.72	2.42	2.391e+01	-2.451e+02	K	CONDUIT -X FACE TEMPERATURE
  2DCENTRT	291.09	2.64	2.832e+01	-2.706e+02	K	DETECTOR HOUSING TEMP 2
  2DTSTATT	291.50	2.38	2.489e+01	-2.110e+02	K	DETECTOR HOUSING TEMP 1
  2FHTRMZT	293.24	2.30	2.252e+01	-1.708e+02	K	FRONT END ELECTRONICS BOX TEMPERATURE
  2FRADPYT	288.92	2.17	2.020e+01	-1.494e+02	K	FRONT END ASSEMBLY +Y AT RADIATOR CENTER TEMP
  2PMT1T	292.61	3.28	3.398e+01	-3.461e+02	K	PMT 1 TEMPERATURE
  2PMT2T	295.07	3.76	3.448e+01	-3.683e+02	K	PMT 2 TEMPERATURE
  2UVLSPXT	287.82	3.10	3.183e+01	-3.142e+02	K	UV LIGHT SHIELD NEXT TO SNOUT TEMP