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Bruce W. Lites High Altitude Observatory National Center for Atmospheric Research

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. Expanding Usage of Inversion codes.

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Bruce W. Lites High Altitude Observatory National Center for Atmospheric Research

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  1. 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

  2. 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

  3. 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

  4. 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 16:33 UT Courtesy of A. Lopez Ariste & R. Casini

  5. 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)

  6. 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/research/cic/index.html • Need for dedicated, full-time programming support in order to realize this as a community resource

  7. 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

  8. 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.

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