GONG MUG

1
Magnetogram Users Group

• Role of the MUG
• Charge
• Functioning
• Agenda
• Scientific Objectives Functional Requirements
• One person's noise is anothers signal
• GONG 101
• What it is now how we got here

2
MUG Charge
The GONG Magnetogram Users Group MUG provides
a forum for the users of the GONG magnetograms to
give feedback and advice to the GONG Program on
the functionality, priorities, data processing
specifications, etc. for the production of
scientifically useful GONG magnetograms Members
are appointed by the GONG Director to represent
all of the scientific uses of the
magnetograms. The MUG will meet at least once a
year and prepare a meeting report, which will be
publicly available.
3
Structure of the Meetings

• Executive Sessions
• Exit Interview
• Written Report
• Chair provide an external focal point, develop
  agenda, coordinate report
• Tel/Video/Online Confs as needed
• Other activities e.g. Hare Hounds

4
NSO Mission Statement

• The mission of the National Solar Observatory is
  to advance knowledge of the Sun, both as an
  astronomical object and as the dominant external
  influence on Earth, by providing forefront
  observational opportunities to the research
  community. The mission includes the operation of
  cutting edge facilities, the continued
  development of advanced instrumentation both
  in-house and through partnerships, conducting
  solar research, and educational and public
  outreach.
•  
• NSO accomplishes this mission by
• providing leadership for the development of new
  ground-based facilities that support the
  scientific objectives of the solar and
  solar-terrestrial physics community
• advancing solar instrumentation in collaboration
  with university researchers, industry, and other
  government laboratories
• providing background synoptic observations that
  permit solar investigations from the ground and
  space to be placed in the context of the variable
  Sun
• providing research opportunities for both
  undergraduate and graduate students, helping
  develop classroom activities, working with
  teachers, and mentoring high school students
• innovative staff research.
•  

5
GONG Mission Statement

• The mission of GONG is to conduct a detailed
  study of the internal structure and dynamics of
  the Sun - as the prototypical star and as the
  source of the variable solar input to the Earth.
• GONG accomplishes this mission by
• Obtaining, and providing unfettered access to the
  scientific community of, the best possible imaged
  ground-based helioseismic data
• Conducting this program through at least a solar
  cycle
• Supporting both global and local helioseismology
  with significant analysis of the data.
• Obtaining magnetic field measurements for their
  correlative, as well as intrinsic, value
• Innovative staff research

6
Scientific Advisory Committee
Overall scientific guidance to the program

• Sarbani Basu (Yale)
• Peter Gilman (HAO)
• Janet Luhmann (U. California-Berkeley)
• Robert Noyes (Harvard-Smithsonian CfA)
• Philip Scherrer (Stanford)
• Mike Thompson (Sheffield U.)
• Alan Title (Lockheed-Martin)
• Juri Toomre (U. Colorado/Chair)
• Roger Ulrich (UCLA)
• Charter Member

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Data Users Committee DUC

• Thierry Appourchaux ( Institut dAstrophysique
  Spatiale )
• Sarbani Basu ( Yale )
• Doug Braun ( Northwest Research Associates )
• Thierry Corbard ( Obs de la Côte dAzur )
• Sylvain Korzennik ( Harvard-Smithsonian CfA )
• Ed Rhodes ( USC )
• Jesper Schou ( Stanford/Chair )
• Philip Stark ( U. California-Berkeley )

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Magnetogram Objectives, Characteristics, Science

• Original
• Provide a mask to remove effect of magnetic field
  on the oscillations ? Once per hour
• GONG
• Remove gap in time series ? Continuous
• What science can the GONG mags uniquely enable?

9
The Network
10
GONG Classic

• 256 ? 256 pixels ? ? 180, rectangular pixels ?
  8
• 60 s cadence
• Magnetograms once per hour at each site shifted
  by 20 minutes between adjacent sites
• Mid-1996 through mid-2001

11
GONG 101

• 1024 ? 1024 pixels square, diameter ? 800, ?
  2.5
• 60 s cadence 30s 16s available
• 90 duty cycle
• Optimized for intermediate scale velocity
• Fourier Tachometer Amplitude, Phase, Mean
  of sine wave with ?/4 ? line width
• Magnetogram ? Difference of velocity in opposite
  circular polarizations

12

• Project ? Program
• Magnetograms a full-fledged component
• What science can GONG magnetograms contribute to
  most effectively?
• What are the requirements to achieve that
  science?