• VectorPaper

Measuring the Vector Magnetic Field of AR 11158 with HMI

• by the VectorFieldTeam

• 1 Intro – Vector magnetic fields (Todd et al.)
  • 1.1 HMI Vector Field Overview
  • 1.2 AR 11158 – X-class Flare

• 2 Instrument and Data Processing (Sebastien & Jesper)

  • 2.1 HMI instrument
  • 2.2 Framelist for vector field
  • 2.3 Relevant calibration of HMI instrument
  • 2.4 Specifics of vector data camera, filtergrams
  • 2.5 Processing of filtergrams – dark, flat, cosmic rays, gap filling, distortion
  • 2.6 Pipeline and special HMI processing
• 3 IQUV calculation (Sebastien)
  • 3.1 Computation of IQUV
  • 3.2 720 calculation – interpolation in time and space, averaging
  • 3.3 Other 720s quantities (very briefly)
• 4 VFISV inversion (Rebecca)
  • 4.1 ME method and VFISV summary
  • 4.2 Specifics of implemented VFISV for this data series
    • 4.2.1 Weighting
    • 4.2.2 The Hack
    • 4.2.3 Convergence Criteria, multiple minima
  • 4.3 Formal Error estimation

• 5 Disambiguation (Graham & KD)

  • 5.1 General method, issues, and uncertainties; planar and spherical
  • 5.2 HMI specifics, thresholds, mapping, annealing
  • 5.3 Bitmap and confidence index
• 6 HMI.B Data series and access (Todd)
  • 6.1 Organization of data series
  • 6.2 Details of HMI.B contents (Rebecca)
  • 6.3 Description of HARPs
  • 6.4 Export – general

• 7 Projections (Xudong & Yang)

  • 7.1 Native format – CCD coordinates etc.
  • 7.2 Coordinate Transformation and Vector Components on Export
    • 7.2.1 Mapping of pixels to regular coordinate system
    • 7.2.2 Vector field components/directions
    • 7.2.3 Handling of computed error quantities
• 8 Known and unresolved issues with HMI data and processing (Yang, et al.)
  • 8.1 Periodic Errors
  • 8.2 Residual Cross-talk
  • 8.3 Disambiguation issues
  • 8.4 Other systematic and instrumental issues that affect data
• 9 Discussion of HMI measurements of AR 11158 - Validation (KD et al.)
  • 9.1 General comments on determination of vector magnetic field
  • 9.2 Time Evolution of AR 11158 – features both real and otherwise
  • 9.3 Validation and limitations of HMI processing and data
  • 9.4 Qualitative comparison with B_LoS, Hinode, and other field measures
• 10 Summary (Todd et al.)
  • 10.1 Remaining work for pipeline modules
  • 10.2 Uses of data – NLFFF, DAVE4VM, other

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