Properties of horizontal flows inside and outside a solar pore

Details Properties of horizontal flows inside and outside a solar pore Properties of horizontal flows inside and outside a solar pore

Nov 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...395..249r&link_type=abstract

Astronomy and Astrophysics, v.395, p.249-255 (2002)

Astronomy and Astrophysics

Astrophysics

7

Sun: Granulation, Sun: Photosphere, Sun: Sunspots

Scientific paper

Horizontal velocities and their temporal variations inside a large pore and in the surrounding granulation are studied from a 73 min sequence of white light frames, acquired at the Swedish Vacuum Solar Telescope (La Palma). The local correlation tracking technique with high spatial (0\farcs 31) and temporal (5 min) resolution was applied to binarized images, yielding 14 independent velocity maps. A ring of divergence centres around the pore was observed in all the maps. Motions directed into the pore, deposited by the divergence centres, continue also within the pore but with magnitudes smaller by factor of 2-3. A link between the variations of large velocity amplitudes around the pore and the brightness fluctuations of umbral dots is suggested. A phase delay between velocity and intensity changes at the periphery of the pore, probably related to the penetration of bright features inwards across the pore's border, was observed.

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