Are granules good tracers of solar surface velocity fields?

Details Are granules good tracers of solar surface velocity fields? Are granules good tracers of solar surface velocity fields?

2001-08-17

arxiv.org/abs/astro-ph/0108284v1

Astronomy and Astrophysics

Astrophysics

4 pages - accepted in Astronomy and Astrophysics

Scientific paper

10.1051/0004-6361:20011160

Using a numerical simulation of compressible convection with radiative transfer mimicking the solar photosphere, we compare the velocity field derived from granule motions to the actual velocity field of the plasma. We thus test the idea that granules may be used to trace large-scale velocity fields at the sun's surface. Our results show that this is indeed the case provided the scale separation is sufficient. We thus estimate that neither velocity fields at scales less than 2500 km nor time evolution at scales shorter than 0.5 hr can be faithfully described by granules. At larger scales the granular motions correlate linearly with the underlying fluid motions with a slope of ~< 2 reaching correlation coefficients up to ~0.9.

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