The amplitude modulation of the 160min solar oscillations
Abstract
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 160min 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 27d period as is observed
 Publication:

Pisma v Astronomicheskii Zhurnal
 Pub Date:
 April 1980
 Bibcode:
 1980PAZh....6..251V
 Keywords:

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