Variations in Solar Luminosity from Timescales of Minutes to Months | Zendy

Jon D. Pelletier | Zendy

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Variations in Solar Luminosity from Timescales of Minutes to Months

Author(s) -

Jon D. Pelletier

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/310049

Subject(s) - radiometer , irradiance , boundary layer , radiative transfer , convection , physics , convection zone , homogeneous , thermal , astrophysics , spectral line , mechanics , optics , computational physics , thermodynamics , astronomy

We present the power spectrum of solar irradiance during 1985 and 1987obtained from the ACRIM project from time scales of minutes to months. At lowfrequency the spectra are Lorentzian. At higher frequencies they areproportional to $f^{-{1/2}}$. A linear, stochastic model of the turbulent heattransfer between the granulation layer (modeled as a homogeneous thin layerwith a radiative boundary condition) and the rest of the convection zone(modeled as a homogeneous thick layer with thermal and diffusion constantsappropriate the lower convection zone) predicts the observed spectrum.Comment: latex file, 1 figur

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