Browsing by Subject "sunspots"
Now showing items 1-3 of 3
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Linear acoustic waves in a nonisothermal atmosphere. II. photospheric resonator model of three-minute umbral oscillations
(IOP Publishing LTD, 2019)The velocity oscillations observed in the chromosphere of sunspot umbrae resemble a resonance in that their power spectra are sharply peaked around a period of about three minutes. In order to describe the resonance that ... -
Modeling sunspot and starspot decay by turbulent erosion
(The American Astronomical Society, 2015-02-20)Disintegration of sunspots (and starspots) by fluxtube erosion, originally proposed by Simon and Leighton, is considered. A moving boundary problem is formulated for a nonlinear diffusion equation that describes the sunspot ... -
Sunspot and Starspot lifetimes in a turbulent erosion model
(2017)Quantitative models of sunspot and starspot decay predict the timescale of magnetic diffusion and may yield important constraints in stellar dynamo models. Motivated by recent measurements of starspot lifetimes, we investigate ...
