1. High Altitude Observatory (HAO) – National Center for Atmospheric Research (NCAR) The National Center for Atmospheric Research is operated by the University Corporation for Atmospheric Research under sponsorship of the National Science Foundation. An Equal Opportunity/Affirmative Action Employer. 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 Bruce Lites, HMI Team Mtg., 2 May 2003 Outlook: substantial and expanding community needing access to polarimetric inversion software

3. New Inversion Techniques Principal Components Analysis Neural Networks: “DIANNE” Support Vector Machines Pattern recognition techniques (Fast!) 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 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.