Small-scale flow field in a sunspot penumbra

Details Small-scale flow field in a sunspot penumbra Small-scale flow field in a sunspot penumbra

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...364..829s&link_type=abstract

Astronomy and Astrophysics, v.364, p.829-834 (2000)

Astronomy and Astrophysics

Astrophysics

27

Sun: Photosphere, Sun: Sunspots, Sun: Magnetic Fields

Scientific paper

We have measured velocity maps of a round sunspot near the center of the solar disk. We derive the small-scale velocity field of the penumbra in the deep photosphere. Superimposed on a radial outflow, we find up- and downflows, which are associated with bright and dark features: The flow in the dark component of the penumbra has a larger inclination angle with respect to the surface normal than the bright component, everywhere in the penumbra. The maximum inclination difference is 8°. In the inner and mid penumbra, bright features (penumbral grains) are associated with an upflow of about 0.6 km s-1. At the outer spot boundary, the flow is inclined downwards predominantly in the dark component (-7degr ).

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