Solar surface velocity fields determined from small magnetic features

Details Solar surface velocity fields determined from small magnetic features Solar surface velocity fields determined from small magnetic features

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..130..295h&link_type=abstract

(Committee of European Radio Astronomers, SNSF, URSI, et al., Workshop on Particle Beams in the Solar Atmosphere, Braunwald, Swi

Physics

67

Magnetic Field Configurations, Solar Atmosphere, Solar Magnetic Field, Solar Rotation, Cross Correlation, Dynamo Theory, Raster Scanning, Solar Activity

Scientific paper

A method for the analysis of magnetic data taken daily at the Vacuum Telescope at Kitt Peak is presented. In this technique, accurate position differences of very small magnetic features on the solar surface outside active regions are determined from one day to the next by a cross-correlation analysis. In order to minimize systematic errors, a number of corrections are applied to the data for effects originating in the instrument and in the earth atmosphere. The resulting maps of solar latitude vs central meridian distance are cross-correlated from one day to the next to determine daily motions in longitude and latitude. Some examples of rotation and meridional motion results are presented.

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