The amplitude modulation of the 160-min solar oscillations

Details The amplitude modulation of the 160-min solar oscillations The amplitude modulation of the 160-min solar oscillations

Apr 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pazh....6..251v&link_type=abstract

(Pis'ma v Astronomicheskii Zhurnal, vol. 6, Apr. 1980, p. 251, 252.) Soviet Astronomy Letters, vol. 6, Mar.-Apr. 1980, p. 137, 1

Physics

1

Amplitude Modulation, Coriolis Effect, Periodic Variations, Solar Oscillations, Solar Rotation, Perturbation Theory, Solar Physics, Time Measurement, Traveling Waves

Scientific paper

The sinusoidal amplitude modulation of the solar oscillations with a period of 160 min is interpreted in terms of solar rotation. Perturbation theory to a first approximation is used to determine how Coriolis forces affect oscillation frequencies. It is found that the spatial pattern of a composite oscillation made up of an oscillation symmetric about the rotation axis and two traveling waves should display a precession about the solar rotation axis with an angular velocity dependent on solar rotation frequency, the type of oscillation and internal structure. For a quadrupole oscillation such as is proposed for the 160-min oscillation, a precession velocity of one half the solar rotation frequency is obtained which implies that the oscillation crests should cross the solar disk with a 27-d period as is observed

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