ACE Weekly Report:  02-07-01

All ACE spacecraft subsystems are performing nominally.  Maneuver
operations were performed on days 037/2001 and 038/2001.  An Attitude
maneuver, two Z-axis Control maneuvers and a Spin Correction burn
were successfully executed on 02-06-01.  The third and final Z-axis
Control burn was performed on 02-07-01.  An attitude maneuver and a
StationKeeping maneuver were also performed.

In preparation for the upcoming Z-axis Control burns on 02-06-01,
several instruments ramped down their high voltage power supplies.
SWICS, SWIMS, SWEPAM-E, and   SWEPAM-I were ramped down on 02-05-01.

On 02-06-01 the S/C was reconfigured from the HGA to the -Z Broadbeam
antenna.  Four maneuvers were performed during the ~9 hour support: 1
Attitude Reorientation, 2 Lissajous Z-axis Control burns and 1 Spin
Rate Correction.  Due to its attitude, the S/C was left in RTSW on
the -Z Broadbeam until the next support on day 038.  The nominal SSR
daily dump was not completed due to insufficient time on the HGA.

On 02-07-01 the remaining Z-axis Control activities were completed
during the ~11 hour support. The majority of the SSR data was
recovered during the support: 552 slices of SSR A and 401 slices of
SSR B.  Local RFI at Station 16 prevented the completion of the dump
during the support.  The remaining SSR A data will be dumped during
the support on day 039.  The final segment of the Z-axis Control
burns was performed as well as both an Attitude Maneuver and
StationKeeping Maneuver.  The Active RF was reconfigured from the -Z
Broadbeam to the HGA following the successful execution of the
attitude maneuver.  SWICS and SWIMS began their high voltage ramp up
activities and will complete their activities on 02-08-01.  SWEPAM-E
and SWEPAM-I will also begin and complete their ramp up activities on
02-08-01.

Anomalies:
G01-0011:  Following the successful completion of the attitude
maneuver on 02-06-01, the GMT clock on the MOR string began to
randomly change from 037 to 062, 254, 110, 051, 140, etc.  Yet
telemetry continued to be received in the MOC with valid s/c time.
The MAR, which was up as a backup, was not experiencing the same
problem with the GMT clock.  While troubleshooting with the TSM the
MOR frontend locked up.  Realtime operations were transitioned to the
MAR and the GAS string was brought up as a backup.  The entire MOR
string was rebooted by the TSM;  no further problems were experienced
with the MOR.  The cause of the corrupted GMT clock/frontend lock up
remains unknown.

G01-0012:  At the beginning of the support the FOT observed the AGC
level was decreasing at a rate of ~ .39dB/minute.  After
troubleshooting the problem for ~20 minutes, the station reported
that the test signal had been inadvertently been left on from Precal.
Once disabled AGC values returned to their nominal values.  No
further problems experienced during the support.

G01-0013:  The MOC experienced ~2.7 hours of degraded telemetry due
to local RFI at Station 16.  Numerous redumps were necessary to
recover the data from the affected slices.  SSR activities were
unable to return to their nominal state as a result.  The remaining
slices will be recovered and activities returned to their nominal
state during the next support on day 039.