Computer Science – Sound
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....62..311m&link_type=abstract
Astronomy and Astrophysics, vol. 62, no. 3, Jan. 1978, p. 311-316. Research supported by the Deutsche Forschungsgemeinschaft an
Computer Science
Sound
60
Astronomical Photography, Balloon Sounding, Radiative Lifetime, Solar Granulation, Astronomical Photometry, Balloon-Borne Instruments, Data Reduction, Solar Physics, Telescopes, Time Series Analysis
Scientific paper
Phenomenological aspects of the temporal evolution of photospheric granulation are reported as derived from time series of granulation photographs obtained during a flight of a balloon-borne telescope. The distribution of granule lifetime probabilities is determined, and it is found that the data can be represented by an exponential decrease with a 'decay constant' of 5.9 min. The general properties of granular evolution are described along with the way individual granules evolve with time. The most common type of granule is shown to be a medium-sized or small fragment, and it is suggested that all granules are produced by fragmentation of preexisting granules. The relative frequencies of granule destruction by fragmentation, fading, and merging are determined to be 51%, 21%, and 28%, respectively. An average radial velocity of 0.8 km/s is computed for conglomerates with an average diameter of 2.25 arcsec.
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