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        @    MTA Monitoring Report 9/01/00 - 9/07/00    @
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Archive of all weekly reports
http://asc.harvard.edu/mta/REPORTS/weekly.html

Archive of Monthly reports
http://asc.harvard.edu/mta/REPORTS/MONTHLY


             ************ Radiation *************

The was a small event on 9/6.  We exceeded the 1.0E+9 fluence trigger.
The 2 hour and Kp monitors did not trip.
Bill and Rob made the decision not to safe. The radiation levels
subsided.


             ************ CTI trend *************

CCD 5 (see Mn K-alpha), especially node 3 shows a DOWNWARD trend
started on 8/20 and bottomed on 9/5. A similar, but much weaker
trend is observed on CCD 6.

          *********** ACIS Focal Temperature ********

For this period, there were 3 peaks.

       Day (DOY)       Temp (C)        Width (DAY)

        244.4           -111.0          0.38
        247.0           -112.1          0.32
        249.7           -109.5          0.39

     ************** MTA Problem Tracking *****************

No new or reopened problem was reported in this period. Following
msids are still coming:

AOVAMPWR, AOFUNLST


             *************  Telemetry ***********

On 9/2, Acis Electronics A 1DP28AVO (DPA +28V INPUT A) spiked down to
26.91 (yellow low/high, red low/high limits: 27.0    34.0    26.0
35.0).
However, Robert Goeke (goeke@space.mit.edu) just recently announced
changes of
limits. The new limits for 1DP28AVO will be  26.0    34.0    26.0 35.0.
Therefore, this is not a violation with the new yellow lower limit.

Eclipse operations
On 9/5, Battery Usage msids, especially EOEB1DIC, showed huge spikes.
The spike of EOEB1DIC reached 24.69. (limits: -1.0    1.0     -1.0 1.0).
Other msids are: EOEB1CIC, EOEB2CIC, EOEB3CIC.


              ************ Trending *************

Around DOM 400, several msids showed new trends. Some of them seem
to have a periodicity.


IRU Temperature and Electronics
AIRU1G1L started upward trend around day 400.  AIRU1BT and AIRUG2L
reached lowest points.

Pcad Gyro Rates
TCM_PAN, TCM_PAN2 (and maybe others) show upward dispersion (a period of

about 200 days).

OBA Thermal
some of OOBTHR** dropped to the lowest point around day 400





             *********** Photon Page ************

MSID   DETECTOR        GRATING TARGET          ANALYSIS         ACA
-----------------------------------------------------------------------
929     ASIS-S          NONE    CL0024+17       OK              OK
919     ACIS-S          NONE    2A0335+096      OK              OK
530     ACIS-I          NONE    A586            OK              PROBLEM
516     ACIS-I          NONE    ZW CL 1358+6245 OK              OK
728     ACIS-S          NONE    3C 58           OK              OK
890     ACIS-S          NONE    A2052           OK              OK
1843    ACIS            NONE    G21.5-0.9       CCD7 PROBLEM?   OK
1842    ACIS            NONE    G21.5-0.9       CCD7 PROBLEM?   PROBLEM
533     ACIS-I          NONE    A773            OK              PROBLEM
415     ACIS-S          NONE    NGC 5273        OK              OK
935     ACIS-I          NONE    AXJ0223+4212    OK              OK
1841    ACIS            NONE    G21.5-0.9       OK              OK
1838    ACIS            NONE    G21.5-0.9       OK              ---
1840    ACIS            NONE    G21.5-0.9       OK              OK
1839    ACIS            NONE    G21.5-0.9       OK              OK
734     ACIS-I          NONE    CYGNUS LOOP SE  SHADOWED?       OK

155     HRC-S           NONE    G21.5-0.9, -Y MPC OK            OK
144     HRC-I           NONE    G21.5-0.9       OK              PROBLEM