Discrete cellular scales of solar convection

Details Discrete cellular scales of solar convection Discrete cellular scales of solar convection

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..145..227a&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 145, no. 2, p. 227-239.

Astronomy and Astrophysics

Astronomy

4

Photosphere, Power Spectra, Solar Convection (Astronomy), Solar Granulation, Mixing Length Flow Theory, Solar Flux, Stellar Models, Velocity Distribution

Scientific paper

The theoretical power spectrum of velocity fields and flux fluctuations at the solar photosphere is calculated using a quasi-nonlinear framework of superposition of unstable convective eigenmodes excited in the solar convection zone. It is demonstrated that this power spectrum exhibits at least three distinct peaks corresponding to granulation, mesogranulation and supergranulation. The vertical velocity and the brightness fluctuation at the solar surface are found to be correlated. The theoretical framework can be adopted for application to other types of stars in order to predict the dominant length scales in the power spectrum of convection in these stars.

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