ACE Weekly 08/04/2010 - 08/10/2010

All ACE spacecraft subsystems are performing nominally.

========================================================================
Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver and
station-keeping maneuver #55 are scheduled for Tuesday 08/17/2010.

=======================================================================
OCRs:

None

========================================================================
Activities:

Data Capture:  100%  DOY 213-220 2010
DOY 220 2010 - 249 days of complete playback data capture and counting

During last week's solar activity, the ULEIS shutter autonomously
closed.  The ULEIS shutter can also close down to 6% and 1% if there is
enough solar activity.
	Tue Aug 3 2010, DOY 215 15:18:50z closed to 25%
	Wed Aug 4 2010, DOY 216 10:13:46z open to 100%


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

None

Update on Anomaly S10-0006 (S-ACE-0515) SEPICA Line Pressure
At the end of April (DOY 116 04/26/2010 23:45:00z), the SEPICA isobutane
line pressure (SSSLINEP) started fluctuating from 2-6psi.  The isobutane
lines had been very stable at 4.2psi until February (DOY 034
02/03/2010).  From Thursday 08/05/2010 (DOY 217 23:00z) to Saturday
08/07/2010 (DOY 219 01:54z), the pressure reading dropped to zero and
has stopped fluctuating.  (See attached plot)

The fluctuations and eventual drop to zero could be due to either a
faulty regulator or a faulty pressure gauge.

Background Information
The isobutane is for 3 Proportional Counters that act as triggers for
particle detection.  The 3 valves that send gas to the Proportional
Counters have all failed during the mission, but have occasionally
opened spontaneously.  The valves have remained closed as follows
	PC1 valve closed since 02/13/1998
	PC2 valve closed since 11/24/2001
	PC3 valve closed since 02/04/2005
The Proportional Counter pressures have remained at zero since the
valves last closed.

The line pressure is measured between the isobutane tank and the closed
valves.  The isobutane tank does not have a pressure gauge, but the tank
temperature has remained stable.


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