ACE Weekly 07/12/2011 - 07/18/2011 All ACE spacecraft subsystems are performing nominally. ======================================================================== 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. ======================================================================= OCRs: None ======================================================================== 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. ======================================================================== 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