ACE Weekly 09/27/2011 - 10/03/2011

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

	Type        Attitude
	Date        09/21/2011
	DOY         264 2011
	Thrusters   2R 4R+ 4R-
	Duration    15:38 min
	Start       13:45:14z
	Stop        14:00:52z
	HGAStart    -7.79deg
	HGAStop     +7.61deg
	SunStart    17.81deg
	SunStop      5.64deg
	SpinStart   5.0146rpm
	SpinStop    5.0186rpm
	Nutation     0.20deg
	Firing      79 pulses
	FuelUsed      0.2492lbs
	FuelRemain  126.7820lbs
	FinalSCMass 1361.042lbs

The next attitude maneuver is scheduled for Friday 10/07/2011.

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OCRs:

DOY 271 (09/15/2011)  1417-1504z  SWICS MOCR 338
Continue investigation of correct Energy trigger.

DOY 272 (09/16/2011)  2121z  SWICS MOCR 338
Correct Energy trigger set (SBCSETATRIG ADC_TRIGGER=8).
ADC=Analog-to-Digital Conversion

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Activities:

Data Capture:  99.99%  DOY 268-275 2011
271-03:06:07 -- 1 second lost due to the redump stopping and starting at
a slice boundary as opposed to starting at the previous slice to capture
the frame that crossed the slice boundary.

There was no ACE pass on Monday 10/03/2011 (DOY 276).  No data loss is
expected, but data capture will be behind by 5-10 hours until Saturday
10/08/2011 when GRAIL is not using as much antenna time.

The Authorization To Connect (ATC) the NASA IONet to the Air Force
Satellite Control Network (AFSCN) expired Tuesday 09/27/2011.  Code 700
has been working on the request package.  When Code 700 is finished, it
will be submitted to the AFSCN Designated Approval Authority (DAA) which
only accepts requests on Fridays.  The antennas that NOAA Space Weather
Prediction Center (SWPC) uses are currently working and AFSCN backup is
not currently needed.  But that can change.

During last week's solar activity, the ULEIS shutter autonomously
closed.  The ULEIS shutter can also close down to 1% if there is enough
solar activity.
	Mon Sep 26 2011, DOY 269 09:57:42z closed to 25%
	Mon Sep 26 2011, DOY 269 12:22:46z closed to 6%
	Tue Sep 27 2011, DOY 270 01:06:30z open   to 25%
	Tue Sep 27 2011, DOY 270 23:58:14z open   to 100%

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Anomalies:

DOY 270  09/27/2011  S-ACE-0523  S10-0007  Increase in SBE_CT_B
SSR B Single Bit Error Count (SBE_CT_B) increased from 9888 to 10662
since last checked on DOY 255 (09/12/2011).  SBE_CT is tracked as a
measure of SSR health.
IMPACT:  Minimal.  Single Bit Errors are automatically corrected by the
SSR.  No non-correctable errors (Hard Single Bit Errors & Double Bit
Errors) have occurred throughout the mission.

	       SBE_CT_A  SBE_CT_B
	1999   15
	2000
	2001
	2002
	2003   270       286
	2004             858
	2005
	2006             2118
	2007   510       3238
	2008             4533
	2009   525       6839
	2010   780       7339
	2011             10662