Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..119..245z&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 119, no. 2, 1989, p. 245-255.
Physics
15
Penumbras, Porosity, Solar Granulation, Sunspots, Video Data, Brightness Distribution, Flow Velocity, Temporal Distribution
Scientific paper
The results of applying modern ground-based optical techniques using data obtained from high-resolution videotapes to the study of solar granulation are addressed. The average lifetime of granules is found to be 16 min, with larger granules having longer lifetimes. Two percent of granules explode, and the probability of a granule being hit by exploding granules at least once is 10 percent. A big exploding event covers about 10 granules. Many small pores change their size and darkness in less than a time scale of 60 min. The integrated darkness of one pore appears to be oscillating with a period of about 30 min. There are clear inflows of both bright and dark penumbra fibrils toward the umbra, from the outer edge of the penumbra. Outflow from the outer edge of penumbra is confirmed. This flow pattern may be related to the moving magnetic features and the moat structure surrounding the sunspots.
Wang Haimin
Zirin Harold
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