Variations in solar luminosity from timescales of minutes to months

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We present the power spectrum of solar irradiance during 1985 and 1987, obtained from the active cavity radiometer irradiance monitor project from timescales of minutes to months. At low frequency, the spectra are Lorentzian [proportional to 1/(f2 + f02)]. At higher frequencies, they are proportional to f-1/2. A linear, stochastic model of the turbulent heat transfer between the granulation layer (modeled as a homogeneous thin layer with a radiative boundary condition) and the rest of the convection zone (modeled as a homogeneous thick layer with thermal and diffusion constants appropriate the lower convection zone) explains the observed spectrum.

Original languageEnglish (US)
JournalAstrophysical Journal
Volume463
Issue number1 PART II
StatePublished - 1996
Externally publishedYes

Fingerprint

luminosity
timescale
irradiance
convection
turbulent heat transfer
radiometers
radiometer
heat transfer
power spectra
monitors
cavity
boundary condition
boundary conditions
low frequencies
cavities
project

Keywords

  • Convection
  • Diffusion
  • Sun: activity
  • Turbulence

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Variations in solar luminosity from timescales of minutes to months. / Pelletier, Jon.

In: Astrophysical Journal, Vol. 463, No. 1 PART II, 1996.

Research output: Contribution to journalArticle

@article{842eb30edeb64657adca3fcf29aa4525,
title = "Variations in solar luminosity from timescales of minutes to months",
abstract = "We present the power spectrum of solar irradiance during 1985 and 1987, obtained from the active cavity radiometer irradiance monitor project from timescales of minutes to months. At low frequency, the spectra are Lorentzian [proportional to 1/(f2 + f02)]. At higher frequencies, they are proportional to f-1/2. A linear, stochastic model of the turbulent heat transfer between the granulation layer (modeled as a homogeneous thin layer with a radiative boundary condition) and the rest of the convection zone (modeled as a homogeneous thick layer with thermal and diffusion constants appropriate the lower convection zone) explains the observed spectrum.",
keywords = "Convection, Diffusion, Sun: activity, Turbulence",
author = "Jon Pelletier",
year = "1996",
language = "English (US)",
volume = "463",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing Ltd.",
number = "1 PART II",

}

TY - JOUR

T1 - Variations in solar luminosity from timescales of minutes to months

AU - Pelletier, Jon

PY - 1996

Y1 - 1996

N2 - We present the power spectrum of solar irradiance during 1985 and 1987, obtained from the active cavity radiometer irradiance monitor project from timescales of minutes to months. At low frequency, the spectra are Lorentzian [proportional to 1/(f2 + f02)]. At higher frequencies, they are proportional to f-1/2. A linear, stochastic model of the turbulent heat transfer between the granulation layer (modeled as a homogeneous thin layer with a radiative boundary condition) and the rest of the convection zone (modeled as a homogeneous thick layer with thermal and diffusion constants appropriate the lower convection zone) explains the observed spectrum.

AB - We present the power spectrum of solar irradiance during 1985 and 1987, obtained from the active cavity radiometer irradiance monitor project from timescales of minutes to months. At low frequency, the spectra are Lorentzian [proportional to 1/(f2 + f02)]. At higher frequencies, they are proportional to f-1/2. A linear, stochastic model of the turbulent heat transfer between the granulation layer (modeled as a homogeneous thin layer with a radiative boundary condition) and the rest of the convection zone (modeled as a homogeneous thick layer with thermal and diffusion constants appropriate the lower convection zone) explains the observed spectrum.

KW - Convection

KW - Diffusion

KW - Sun: activity

KW - Turbulence

UR - http://www.scopus.com/inward/record.url?scp=15444363231&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=15444363231&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:15444363231

VL - 463

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 PART II

ER -