Multiperiodic irradiance changes caused by r-modes and g-modes

Details Multiperiodic irradiance changes caused by r-modes and g-modes Multiperiodic irradiance changes caused by r-modes and g-modes

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..109....1w&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 109, no. 1, 1987, p. 1-18.

Statistics

Computation

24

Nonlinear Systems, Solar Activity, Solar Oscillations, Solar Radiation, Solar Rotation, Computational Astrophysics, Hemispheres, Sounding Rockets, Stellar Mass

Scientific paper

More than 20 real periodicities ranging from 20 days to 2 years modulate the solar irradiance data accumulated since November 1987 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 (27.1d, synodic).

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