ACE Weekly 09/27/2011 - 10/03/2011 All ACE spacecraft subsystems are performing as expected. ======================================================================== 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. ======================================================================= 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 ======================================================================== 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% ======================================================================== 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