Astronomy and Astrophysics – Astronomy
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009spd....40.0929h&link_type=abstract
American Astronomical Society, SPD meeting #40, #9.29; Bulletin of the American Astronomical Society, Vol. 41, p.822
Astronomy and Astrophysics
Astronomy
Scientific paper
Supergranulation is present everywhere in the photosphere except in sunspots and plays an important role in organizing the photospheric magnetic field. Recent observations also have shown that supergranule cell size is anti-correlated with magnetic activity. Understanding how supergranulation varies with solar cycle may explain the variability of the radiance of the quiet, non-active, Sun. This work will look at properties of supergranules using Ca II K images from the Precision Solar Photometric Telescope (PSPT) as a first step to examining the Mt. Wilson Ca II K archive spanning 6 solar cycles. First, we will determine the robustness of measurements by using several techniques and by smoothing images to mimic poorer seeing conditions. Second, we will look at properties of the supergranules as a function of solar activity. These will include moments of the cell area distribution (mean, standard deviation, and skewness) as well as differences between supergranules in the northern and southern hemispheres of the Sun.
Eparvier Francis G.
Hock Rachel
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