Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...306..947s&link_type=abstract
Astronomy and Astrophysics, v.306, p.947
Astronomy and Astrophysics
Astrophysics
81
Sun: Magnetic Fields, Sun: Granulation, Sun: Faculae, Plages, Sunspots
Scientific paper
Horizontal dynamics in observations of NOAA AR 5617 are studied by tracking individual elements through the field of view. Small magnetic elements of both magnetic polarities occur everywhere in the active region, and define unipolar thread-like concentrations of magnetic field of up to 15Mm length. The horizontal granular flow field in the active region is divergent (e-time scale 2.1hours) and clockwise (time scale 32hours). Facular elements are tracers of (clumps of) fluxtubes. A hierarchy of movement of magnetic elements appears: Facular elements everywhere in the active region move obliquely toward the edges of the active region of the same polarity as their own, faster than those edges (as defined by strings of pores) move apart. The pores move along the edges toward the major sunspots of their own polarity, and the major sunspots of either polarity move apart. The separation velocity of both polarities of facular elements is about 0.84km/s, of pores about 0.73km/s, and that of the major sunspots is about 0.50km/s.
Scharmer Goran
Strous Louis H.
Tarbell Ted D.
Title Alan M.
Zwaan Cornelis
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