Abstract
More than 20 real periodicities ranging from 20 days to 2 years modulate the solar irradiance data accumulated since November 1978 by Nimbus 7. Many are quite strong during the first three years (solar maximum) and weak after that. There is a high correspondence between periods in irradiance and 28 periods predicted from the rotation and beating of global solar oscillations (r-modes and g-modes). Angular states ℓ = 1, 2, and 3 are detected as well as some unresolved r-mode power at higher ℓ. The prominence of beat periods implies a nonlinear system whose effective nonlinear power was measured to be about 2. This analysis constitutes a detection of r-modes in the Sun and determines from them a mean sidereal rotation rate for the convective envelope of 459 ± 4 nHz which converts to a period of 25.2 days (27.ld, synodic).
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Wolff, C.L., Hickey, J.R. Multiperiodic irradiance changes caused by r-modes and g-modes. Sol Phys 109, 1–18 (1987). https://doi.org/10.1007/BF00167395
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DOI: https://doi.org/10.1007/BF00167395