Community Inversion Codes (CIC) for Inference of Vector Magnetic Fields from Spectro-Polarimetric Data

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Community Inversion Codes (CIC) for Inference of
Vector Magnetic Fields from Spectro-Polarimetric
Data

• Bruce W. Lites
• High Altitude Observatory
• National Center for Atmospheric Research
• HMI Team Meeting, Palo Alto, 1-2 May 2003

1 May 2003
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Expanding Usage of Inversion codes

• New Instrumentation
• Space SDO, Solar-B, Sunrise, (Solar Orbiter?)
• Ground-Based ASP, DLSP, SOLIS, POLIS, SST
  (LPSP), TIP, THEMIS, .
• New applications
• More physics multi-component, MISMA, LOS
  gradients, non-LTE, MHD models, hyperfine
  structure
• New regimes chromosphere, prominences, weak
  fields

Outlook substantial and expanding community
needing access to polarimetric inversion software
Bruce Lites, HMI Team Mtg., 2 May 2003
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New Inversion Techniques
Pattern recognition techniques (Fast!)

• Principal Components Analysis
• Neural Networks DIANNE
• Support Vector Machines

More Physics

• Chromospheric Non-LTE inversions NICOLE
• Line-of-Sight Gradients of Field, Atm LILIA
• Sub-resolution structure multi-component MISMA
• Hyperfine atomic structure

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New Regimes
Example Inversion of Prominence HeI D3
Measurements

• Analysis of full spectral profile of HeI D3
  multiplet
• Embraces full QED treatment of atom,
  simultaneously embracing Hanle, Zeeman, and Kemp
  polarization effects

25 May 02 1633 UT Courtesy of A. Lopez Ariste
R. Casini
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CIC A Proposed Repository for Standardized
Inversion Methods. GOALS

• User support
• Portable codes platform- and UNIX-like
  OS-compatable
• Efficiency I.e. optimization for parallel
  architecture
• User-friendly documentation
• Modular design to allow easy modification by
  users
• Frequent updates to incorporate new physics
• Visualization of results (e.g. AZAM)
• Uniformity of presentation (I.e., like SOLARSOFT)

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Status of CIC

• Initially envisioned as part of the
  still-unfunded NSF community program, Solar
  Magnetism Initiative
• Hector Socas-Navarro maintains some of his codes
  at CIC website http//www.hao.ucar.edu/public/res
  earch/cic/index.html
• Need for dedicated, full-time programming support
  in order to realize this as a community resource

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Benefits of CIC to HMI

• Standardization of inversion software across
  varied inversion techniques
• Integrated data visualization, analysis (I.e.
  azimuth ambiguity resolution)
• Community support for ancillary, coordinated
  vector field data (I.e. chromospheric field
  measurements)
• Explicit presentation of assumptions,
  approximations, validity leading to inversion
  results

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In Summary ..
This is a blatant solicitation to the HMI
community for advocacy of an NCAR proposal to
support CIC within the framework of the Living
With a Star program.