ACE Weekly 08/28/2012 - 09/03/2012

All ACE spacecraft subsystems are performing as expected.

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Orbit/Attitude:

No maneuvers were completed this week.  The next attitude maneuver is
scheduled for Thursday 09/06/2012.

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OCRs:

None


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Activities:

Data Capture:  100%  DOY 239-246 2012

The SWEPAM team has proposed increasing the minimum sun angle
constraint.  The SWEPAM-Ion instrument has a series of channel electron
multipliers (CEMs).  Keeping the spacecraft at larger sun angles would
direct the solar wind to more responsive CEMs.  A presentation on the
attitude maneuver costs of higher sun angles will be given on Thursday
September 6.

The SSMO review for ACE using the WS1 ground antenna has been scheduled
for Monday September 10.

During the Labor Day solar activity, the ULEIS shutter autonomously
closed, the reopening will be reported in next week's report
	Mon Sep 3 2012, DOY 247 10:35:18z closed to 25%
	Mon Sep 3 2012, DOY 247 12:41:10z closed to 6%

The NOAA SIS data shows slightly more noise when NOAA is processing data
from the MMOC.  Two configuration changes were tested on Thursday
8/30/2012 to see if they would fix the NOAA processing of SIS data.  1)
Data from DSN is bunched together, e.g. 5 frames within 1 second then a
4 second gap.  The data from the MMOC was buffered and sent to NOAA more
evenly spaced.  2) The connection to NOAA was reset after transitioning
from low-rate data (RTSW) to high-rate data (ADC/Science).  Neither of
these two actions resolved the slight increase in noise.  This is a
minimal issue that was discussed during last week's Science Working Team
meeting.  The test was done to see if there was an easy solution to the
problem.  The test results have been provided to the instrument team and
no additional actions are planned at this time.

Note, the major errors in NOAA processing of SIS data from the MMOC have
not re-appeared since June 2012.  The MMOC software was updated to avoid
multiple connections to NOAA's server (DSN->NOAA SWPC and AFSCN->NOAA
SWPC) which we believe resolved the problem.

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Anomalies:

DOY 244  08/31/2012  S-ACE-0647  G12-0009  DSN TLM SLE Provider
The MMOC SLE Software (MUS) was unable to connect to DSN TLM SLE
Provider (ECONNREFUSED).  ECONNREFUSED usually indicates that JPL needs
to restart the SLE process.  The problem resolved itself and DSN
reported that no actions were taken on their part.  This problem last
occurred on 8/10/2012 (DR# N108304).
IMPACT:  Activities delayed 12 minutes.  No impact to NOAA SWPC since
the spacecraft was in RTSW during the 40 minutes.


DOY 247  09/03/2012  S-ACE-0647  G12-0009  DSN TLM SLE Provider
The MMOC SLE Software (MUS) was unable to connect to DSN TLM SLE
Provider (ECONNREFUSED).  The FOT requested that JPL restart their SLE
process which fixed the problem.  This problem last occurred on
8/31/2012.  (DR# N108361)
IMPACT:  Activities delayed 12 minutes.  No impact to NOAA SWPC since
the spacecraft was in RTSW during the 40 minutes.