Variability of the structure of the granulation over the solar activity cycle

Details Variability of the structure of the granulation over the solar activity cycle Variability of the structure of the granulation over the solar activity cycle

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.220...51m&link_type=abstract

In ESA The Hydromagnetics of the Sun p 51-54 (SEE N85-25091 14-92)

Astronomy and Astrophysics

Astronomy

4

Astronomical Photography, Solar Activity Effects, Solar Granulation, Image Processing, Solar Cycles, Solar Flux Density, Sun

Scientific paper

High resolution photographs of solar granulation were computer processed to study the structure of the granulation and its variation over the solar cycle. The number of granules increases continuously toward the smaller scale: solar granulation has no dominant scale. However, the flux distribution shows that granules of size of 1.4 in contribute most to the observed intensity; the contribution from small scale and large scale granules is vanishing. This might explain why solar granulation gives the impression of having a dominant scale, although the number of granules increases toward the smaller scales. The number of granules per surface unity at the center of the disk varies over the solar cycle, confirming counts made directly on photographs: granules are more numerous near solar maximum than near minimum. Nevertheless, this result has to be confirmed on additional very high and homogeneous granulation pictures, taken from now to the next solar minimum.

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