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HMI Vector Magnetic Field Products

For the most up-to-date information on all the vector data products, including current release information, see the wiki.

The vector magnetic field is derived from full-disk filtergrams collected in a 135-second sequence. The observations are obtained in polarized light at several wavelengths across a spectral line. The filtergrams are calibrated and registered to account for solar rotation before being combined to provide Stokes polarization parameters. The parameters are used to determine the magnetic and other plasma parameters using VFISV, a Milne-Eddington inversion code. The final step is to disambiguate the data, that is infer the azimuthal direction of the transverse field.

Vector Field Quantities Described in More Detail Below

SHARP Data - Tracked Space-weather HMI Active Region Patches. Available Fall, 2012.

Vector magnetic field in HMI Active Region Patches tracked during their disk transit will become available in fall 2012. These data have been available for near real time applications in a non-science quality version since mid September. The disambiguated vector data will be provided in native CCD coordinates every 12 minutes and also in standard Cartesian projected CEA (Cylindrical Equal Area) coordinates centered on the tracked region. The SHARP data series provide several maps of other HMI observables and derived space weather indices for each HARP at each time step.

For a more complete description of SHARPs, look here. See HARPS for a description of HMI Active Region Patches. Go to the VectorMagneticField Wiki entry for more details. For release of early Science-quality active region data, see ReleaseNotes2.

ME Data - Milne-Eddington Inversions:

Currently our most complete definitive vector field product is the ME inversion data processed using the Very Fast Inversion of the Stokes Vector (VFISV) scheme. VFISV provides the primary data segments of field strength, inclination and azimuth. No disambiguation of the azimuth has been performed in the ME data product, so azimuths are in the range 0-180, not 0-360.

Stokes Profile Data:

Coverage Maps:

Our JSOC Wiki provides an overview of the HMI Magnetic Field Products and links to more detailed information.

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