=== 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

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