Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...241..219b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 241, no. 1, Jan. 1991, p. 219-226. Research supported by DFG.
Astronomy and Astrophysics
Astrophysics
39
Brightness Temperature, Solar Activity Effects, Solar Flux Density, Solar Granulation, Ccd Star Tracker, Flow Distribution, Imaging Techniques, Spatial Resolution
Scientific paper
A 79 min series of CCD images of the solar granulation with subarcsec spatial resolution is analyzed. Local correlation techniques are applied to determine horizontal displacements of the granular intensity pattern in a 14.2 by 12.2 sq arcsec field of view. The divergence of the average horizontal flow field shows mean cell sizes of 5 to 7 arcsec. Granules are selected with respect to area, brightness, lifetime, and expansion rate. It is shown that small, faint, short-lived, and fast collapsing granules are located preferentially in the negative divergence (down-draft) regions of the mesogranular flow field, while bright, long-lived, and rapidly expanding granules populate preferentially the positive divergence (up-draft) regions. The differences in area coverage range between + or - 6 percent and + or - 9 percent.
Brandt Peter N.
Ferguson Sarah
Scharmer Goeran B.
Shine Richard A.
Tarbell Ted D.
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