The Photospheric Velocity Field of Active Regions Derived from SDO/HMI Vector Magnetograms

Details The Photospheric Velocity Field of Active Regions Derived from SDO/HMI Vector Magnetograms The Photospheric Velocity Field of Active Regions Derived from SDO/HMI Vector Magnetograms

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011spd....42.2112m&link_type=abstract

American Astronomical Society, SPD meeting #42, #21.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a first analysis of solar active regions observed with the Helioseismic and Magnetic Imager (HMI) on the Solar Dynamics Observatory (SDO). Since HMI continuously observes the complete solar disk at a good spatial resolution we are able to follow active regions over several days, providing the opportunity to study the evolution of the flow field during the various stages of development of the active regions. HMI measures the photospheric vector magnetic field at a cadence of 12 min. To determine the velocity field we use the optical flow technique DAVE4VM (differential affine velocity estimator for vector magnetograms) and apply it to the vector magnetic field data from SDO/HMI.

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