Determination of solenoidal horizontal velocities in solar active regions

Details Determination of solenoidal horizontal velocities in solar active regions Determination of solenoidal horizontal velocities in solar active regions

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...215..168b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 215, no. 1, May 1989, p. 168-176.

Astronomy and Astrophysics

Astrophysics

Magnetic Effects, Photosphere, Solar Activity Effects, Sunspots, Fourier Transformation, Line Of Sight, Solar Magnetic Field, Velocity Distribution

Scientific paper

A method is proposed and tested which makes it possible to determine completely the photospheric velocity field in active regions from measurements of the component along the line of sight through integration of the incompressibility condition. Its validity is first tested on a simple vortex, then applied to real data. As expected, vortexlike structures are well restored, whereas Evershed flows are not. The reasons for that are analyzed, and improvements are suggested.

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