ACE Weekly 07/12/2011 - 07/18/2011

All ACE spacecraft subsystems are performing nominally.

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Orbit/Attitude:

	Type        Attitude
	Date        07/15/2011
	DOY         196 2011
	Thrusters   2R 4R+ 4R-
	Duration    14:08 min
	Start       15:56:54z
	Stop        16:11:02z
	HGAStart    -6.92deg
	HGAStop     +7.64deg
	SunStart     6.50deg
	SunStop     17.40deg
	SpinStart   5.0024rpm
	SpinStop    5.0055rpm
	Nutation     0.17deg
	Firing      71 pulses
	FuelUsed      0.2266lbs
	FuelRemain  127.6672lbs
	FinalSCMass 1361.927lbs

The next attitude maneuver is scheduled for Wednesday 08/03/2011.

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OCRs:

None


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Activities:

Data Capture:  100%  DOY 191-198 2011

NOAA Space Weather Prediction Center (SWPC) upgraded their server that
receives real-time data from the MMOC on Tuesday 7/12/2011.  NOAA SWPC
was unable to process the high-rate real-time data (1 frame per second)
on the new server.  NOAA SWPC switched back to their old server on
Thursday 07/14/2011 and was able to receive high-rate real-time data (1
frame per second).

Testing of the new network from the Air Force Satellite Control Network
(AFSCN) to the NOAA Space Weather Prediction Center (SWPC) started on
Friday 07/15/2011.  ACE data was not reaching the new Small Conversion
Device (SCD).  The problem is being investigated by NASA Integrated
Services Network (NISN).  The old network from AFSCN to NOAA SWPC was
disconnected on September 1, 2010with the closing of the Onizuka Air
Force Base.

The GRAIL mission is expected to launch 09/08/2011.  ACE has reduced DSN
antenna time during September.  The current schedule has ACE losing ~15%
data over 3 weeks in September.  The data loss will be greater if there
are problems with any of the passes.

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Anomalies:

DOY 194  07/13/2011  S-ACE-0523  S10-0007  Increase in SBE_CT_B
SSR B Single Bit Error Count (SBE_CT_B) increased from 8447 to 9888
since last checked on DOY 186 (07/05/2011).  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             9888

This is the third time that SSR B has saved the memory location of the
Single Bit Error:
	05/02/2008	1faafd5 = slice 253.3434219
	07/31/2009	1faaf64 = slice 253.3425598
	07/13/2011	1faafdb = slice 253.3434677