Power spectra of solar convection

Details Power spectra of solar convection Power spectra of solar convection

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..314c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 1, 1991, p. 314-320. Sponsorship: National Science Council of the

Other

38

Convection Cells, Power Spectra, Solar Granulation, Solar Magnetic Field, Solar Oscillations, Doppler Effect, Fourier Transformation, Photosphere, Solar Atmosphere

Scientific paper

The properties of convective motions on the sun are studied using Kitt Peak Doppler images and power spectra of convection. The power peaks at a scale of about 29,000 km and drops off smoothly with wavenumber. There is no evidence of apparent energy excess at the scale of the mesogranulation proposed by other authors. The vertical and horizontal power for each wavenumber are obtained and used to calculate the vertical and horizontal velocities of the supergranulation. The amplitude of vertical and horizontal velocities of the supergranulation are 0.034 (+ or - 0.002) km/s and 0.38 (+ or - 0.01) km/s, respectively. The corresponding rms values are 0.024 (+ or - 0.002) km/s and 0.27 (+ or - 0.01) km/s.

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