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MMS Science Operations and Data Analysis Working Group News:

Quiet week for SITL but 15 Aug pass deserves full court press

Post-Launch Assessment Review in parallel with this teleconference

Online data analysis workshops: alternating Tuesdays continuing 1 Sep., 11:00 Eastern

0.0 15Aug2015 –  VxB_comparison_20150815  – DensityComparison_20150815Plot 2


1. 0 Travel Notes

  • Chapman Conference and AGU registration and housing is open

2.0 MMS Flight Dynamics and Ephemeris/Attitude

  • Formation maintenance maneuver scheduled for August 31/September 1 to keep at 160 km.
  • First formation resize maneuver scheduled for September 16/17 for 60 km.
  • Phase 1A Sliding Science ROI: 
    • Recall our previous discussion RE orienting the entry/exit of ROI to optimize orientation with predicted magnetopause. This "sliding science ROI" will be implemented as soon as possible; Steve Petrinec is running an updated plan.  See Steven's previous presentation for an example.
    • ROI is determined based on average magnetopause conditions (based on OMNI or ACE at this time in the previous solar cycle?).  The instrument commanding is done at least 3 weeks in advance, so this ROI will not be based on "current conditions". 

3.0 MMS Burst Memory Management

  • Thanks to Jim Burch for his service during the first official MMS SITL cycle.
  • Tom Moore is the current SITL, with Roy Torbert being the SITL on Deck for next week.
  • Recall SITL email list for updates
  • Recall SITL Operations list for schedules and the SITL Reports Page for outcomes
  • Mitsuo Oka made the following plot summarizing MMS burst memory management over time.  The thin black curve shows the total number of buffers HELD for more than 3 days. If the thin black curve approaches the grey-shaded region, we are in danger of loosing segments. The table shows the number of currently pending segments.  Definition of Category 0, 1, 2, etc, is here.


  • If there are updates to the SITL CDF data product structure, content, or delivery schedules; please notify the Supervisory SITLs before deployment.   We have had a few disruptions to the SITL process when new files were not compatible with the SITL software.  Similarly, you should notify this forum for broader changes so that the broader range of codes can be smoothly updated as well.
  • FPI plans to release updated versions of the SITL CDF files this week (as soon as the release notes are ready).  These files, with version v0.1.0, should not disrupt current display/analysis codes.  The update does provide updated/corrected moments, which should be very welcome.
  • MMS inclusion into SPEDAS is progressing.  There are crib sheets in the MMS Project folder that are of use now.  As these progress and data products become available these will be expanded and inclusion in the GUI will continue to expand. 

5.0  NO UPDATE FOR NOW – Tetrahedron Management:

Following is a plot with the definitive quality factor for Rev 143.  


  • STP-MMS-P40: Spacecraft Constellation Formation Quality.  A Quality Factor shall be developed that defines the usefulness of the tetrahedron formation of the four spacecraft that is the product of two functions. One function is a metric of the inner spacecraft separation, and the other is a metric of the tetrahedron shape.  This Quality Factor shall be greater than or equal to 0.7 for 80% of the time in the regions of science interest. The regions of science interest are defined as geocentric distances >9 RE for Phase 1, and >15 RE for Phase 2. There is no formation requirement or region of science interest defined during the transition from Phase 1 to Phase 2.





MMS Online Data Analysis Telecon
Tuesday, September 1, 2015
10:00 am  |  Central Daylight Time (Chicago, GMT-05:00)  |  2 hrs
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Meeting number:    809 629 067
Meeting password:    Smart1
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