Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161...31n&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. 31-38. Navy-NSF-sponsored research.
Astronomy and Astrophysics
Astrophysics
10
Photosphere, Solar Granulation, Astronomical Photography, Astronomical Photometry, Convection, Stratoscope Telescopes
Scientific paper
Based on high-resolution granulation photographs obtained on the Stratoscope-I flight of August 17, 1959, a morphological study of the evolution of exploding granule expansion rate is found to increase linearly with size, with 1.7-3.2 km/s for granules with maximum attained diameters of 3-5.5 arcsec. Granules with the shortest axis of 2.2 arcsec are seen to develop the characteristic ring-like appearance with a round darkening in the center, and the exploding granules are found to occupy roughly 2.5 percent of the solar surface at any moment. In a study of the typical exploding granule, the size and intensity depression of the central darkening are shown to evolve with granule expansion in the rapidly growing phase, and the intensity drop is found to reach 25 percent of the granule brightness.
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