1. Faraday Rotation David Le Vine Aquarius Algorithm Workshop March 9-11, 2010

2. Approach Rotation Angle Retrieved from 3 rd Stokes Parameter*: Ω F = 0.5 Atan[ T3 / (Tv – Th) ] * S. Yueh, “Estimation of Faraday Rotation with Passive Microwave Polarimetry for Microwave Remote Sensing of Earth Surfaces”, TGARS, Vol 38 (#5), pp. 2434, Sept. 2000.

3. Example: Aquarius Simulator Antenna temperature for vertical polarization (top), horizontal polarization (middle) and third Stokes parameter (bottom) for the Aquarius middle beam.

4. Retrieved Faraday Rotation Angle (Top) Faraday rotation angle at boresight of the middle radiometer beam. (Bottom) Third Stokes parameter for the same antenna.

5. Plan Test – SMOS “full-pol” data Remove spurious signals – Filter at land/water boundaries – Match to theoretical profile Magnetic field + estimate of TEC Remove bias – Match ground truth (sounder) at selected locations Backup Plan – Use model (data assimilation) – Correct for altitude (SMOS algorithm)

6. Retrieved Faraday Rotation Angle (Top) Faraday rotation angle at boresight of the middle radiometer beam. (Bottom) Third Stokes parameter for the same antenna. Rotation Angle Retrieved from 3 rd Stokes Parameter*: Ω F = 0.5 Atan[ T3 / (Tv – Th) ] * S. Yueh, “Estimation of Faraday Rotation with Passive Microwave Polarimetry for Microwave Remote Sensing of Earth Surfaces”, TGARS, Vol 38 (#5), pp. 2434, Sept. 2000.