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    * Back to ["HMIModuleTable"]     * Back to [[HMIModuleTable]]

HMI Pipeline Module - Stokes Inversion

This HMI vector field pipeline module performs an inversion on an input DRMS data set containing I,Q,U,and V to determine the vector magnetic field parameters. The outputs are Total Magnetic Field Strength, Filling Factor, Inclination of the field to the line of sight, Azimuth (not disambiguated, so 0 - 180 degrees) relative to the top of the CCD camera, and uncertainties on each quantity.

Module Inputs
  • DRMS data set containing averaged I,Q,U,and V derived from HMI level 1.0 corrected filtergrams

Module Outputs
  • Vector magnetic field quantities
    • B Total - total magnetic field strength in pixel
    • Filling Factor - fraction of pixel with magnetic field
    • Inclination - angle in degrees the vector field makes to the line of sight to the pixel; 0 degrees toward observer
    • Azimuth - angle in degrees the tangential field makes to nominal instrument "north" (TBR) counter clock-wise
    • Uncertainties - quantitative estimates of uncertainties of the above quantities

Cadence
  • Module will nominally run every 12 minutes on Active Region Patches and less frequently on the entire Sun.

  • Can be run on longer or shorter cadence in on demand mode, could be run with as little 90 seconds of HMI filtergrams.

Archive
  • These products are archived

Overall Status of Module
  • 98% complete; addressing DRMS interface issues

Status of Code
  • 99% complete
  • Current version of code runs successfully; still deciding on output details
  • Code will require adjustment during commissioning as experience is gained with HMI instrument characteristics.
  • Algorithms continue to be adjusted for speed and performance.

Status of DRMS module
  • 98% - earlier version functioned nominally, working on DRMS interface issues

Issues needing resolution
  • How to handle weak field regions
  • How to indicate lack of convergence of fit

Responsible scientist
  • Yang Liu, Rebecca Centeno Elliott, Steve Tomczyk, Rick Bogart, Juan Borreros

Remarks
  • Algorithm described in paper: TBD

JsocWiki: StokesInversion (last edited 2013-05-01 04:35:26 by localhost)