Statistics – Computation
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..110..129c&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 110, no. 1, 1987, p. 129-138.
Statistics
Computation
10
Angular Momentum, Astronomical Photometry, Perturbation Theory, Solar Magnetic Field, Velocity Distribution, Cartesian Coordinates, Cells, Computational Astrophysics, Solar Cycles
Scientific paper
The authors limit the photometric contrast of solar giant convection cells using λ525.6 nm continuum images obtained on 15 days in May 1985. The r.m.s. of the giant cell intensity pattern must be less than or equal to the observed r.m.s. on spatial scales 80 to 240 Mm which is 0.023% or, equivalently, 0.33K. However, the spatial scale and time-scale dependence of the variance demonstrate that giant cells are not the source of the observed variance. Consequently, a tighter constraint on the r.m.s. of the giant cell pattern may be placed, namely 0.016% or 0.23K. This limit is consistent with temperature perturbations estimated from recent nonlinear simulations of global-scale solar convection. The authors use this limit on the r.m.s. of the giant cell pattern to estimate that the contribution of giant cells to the fluctuation of the solar irradiance on a one-month time-scale is less than 3×10-5s.
Chiang Wei-Hwan
Foukal Peter V.
Petro Larry D.
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