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 ============================================================================ 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 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~