ACE Weekly 08/30/02 - 09/05/02

All ACE spacecraft subsystems are performing nominally. An attitude 
maneuver was executed this week with no problems to report. The next 
attitude maneuver is scheduled for 09/06/02.

============================================================================
OCRs Executed:

09/04/02  SEP-103 => Switch SEPICA SSD gain from high to low.

The SEPICA SSD gain setting optimizes measurements for either high energy 
elemental fluxes or charge states.  Since June 5, 2002, the gain setting 
has been high, which optimizes charge state measurements.  Now the gain 
will be set low for a period of time to optimize high energy elemental flux 
measurements

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Ongoing Activity:

The engineering test to determine the new HGA constraint is continuing. The 
current constraint is 6.0 deg., with current tests reaching 6.5 degrees.
The FOT has been monitoring the Signal Strength, the MFR AGC levels, and 
the Signal-to-Noise Ratios(SNR). The drop in RF levels from an HGA angle of 
0 deg to 6 deg has been approximately 3dB. There has been no loss of 
telemetry due to the increased HGA angles. Analysis is ongoing to determine 
new HGA angle constraint.

The following HGA angles and range values are from FDF.

Man Date    Pre Man     Post Man    Earth-ACE Range
03/28/02     -4.58 deg   +4.38       1408287 km
04/04/02     -4.35       +4.50       1414808
04/11/01     -5.09       +3.79       1428491
04/18/02     -5.16       +3.85       1440512
04/26/02     -5.77       +5.56       1455949
05/06/02     -5.72       +5.43       1493008
05/17/02     -5.81       +5.31       1527979
05/28/02     -4.34       +4.88       1550263
06/06/02     -2.38       +5.96       1576064
06/20/02     -6.57       -3.66       1590405
06/26/02     -6.43       +5.94       1592458
07/12/02     -6.5        +6.5        1598879
07/30/02     -6.5        +6.5        1567441
08/13/02     -5.34       +6.43       1532343
08/23/02     -3.28       +4.64       1493746
08/30/02     -4.12       +6.36       1475423

============================================================================
TPOCC Release 5.2 String 1 Status

TPOCC Release 5.2 was installed on String 1 on 9/5/02. Realtime operations 
have been transferred to String 2 (with String 3 as backup).  String 1 
testing will begin following TSM checkout.

============================================================================
Anomalies:

NONE







~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Glen A. Miller
Honeywell Technology Solutions Inc.

ACE Flight Operations Team
Goddard Space Flight Center
Building 14, Room W10A
Mail Stop 428.2
Greenbelt, MD 20771

Office: 301-286-7071
Fax:    301-286-1729
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~