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 Flux, 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 flux in pixel
  • Filling Factor - fraction of pixel with magnetic field
  • Inclination - angle the vector field makes to the line of sight to the pixel
  • Azimuth - angle the tangential field makes to nominal instrument "north"
  • 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

• 95% complete.
• Earlier version of module ran on HMI test data sets, currently not functioning

Status of Code

• 90% complete
• Recent version of code was able to run successfully
• 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

• 95% - earlier version functioned nominally

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

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