Intensity contrast and distribution on the solar surface: old wisdom with a surprising twist.
Affiliation
Kiepenheuer-Institut für Sonnenphysik, Freiburg & Istituto Ricerche Solari Locarno
Main category
Natural Sciences (Astrophysics and Astrononmy)
Abstract
The rms of the relative fluctuation of the continuum intensity over the solar surface is sometimes taken as a measure for the quality of seeing and the telescope optics. Given space conditions, it increases with increasing telescope aperture, hence with increasing spatial resolution. Not so for the simulations, which show a fairly constant high contrast, independent of spatial resolution. This apparent paradox is also reflected in the intensity histogram. Instead of the bimodal histograms known from observations and simulations with two peaks corresponding to the granular and the intergranular intensities, we predict the disappearance of this bimodality at high spatial resolution.
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