Supergranule variability in Mt. Wilson Ca II K images

Details Supergranule variability in Mt. Wilson Ca II K images Supergranule variability in Mt. Wilson Ca II K images

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640107h&link_type=abstract

American Astronomical Society, AAS Meeting #216, #401.07; Bulletin of the American Astronomical Society, Vol. 41, p.858

Astronomy and Astrophysics

Astronomy

Scientific paper

We examined the Mt. Wilson Ca II K archive to quantify the long-term changes in the average size of supergranules over five solar cycles from 1930 to 1985. We determined that, although the Mt. Wilson Ca II K images are limited by atmospheric seeing, there is sufficient contrast in the images to identify supergranules. In general, we found that supergranule size increases during the rising phase of a solar cycle, reaching a peak at solar maximum. In the declining phase of a solar cycle, supergranule size has a larger second peak, becoming out of phase with the solar cycle for several years.

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