Time variations of the angular momentum of the sun

Details Time variations of the angular momentum of the sun Time variations of the angular momentum of the sun

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...216..650s&link_type=abstract

Astrophysical Journal, Part 1, vol. 216, Sept. 1, 1977, p. 650-653. NSF-supported research.

Astronomy and Astrophysics

Astrophysics

2

Angular Momentum, Astronomical Models, Solar Rotation, Time Dependence, Angular Velocity, Density Distribution, Solar Oblateness, Stellar Models

Scientific paper

Time variations of density models of the sun are investigated. This is an attempt to estimate the changing moment of inertia of the sun in order to calculate the internal solar angular velocity based upon Newton's equation of motion. Previous estimates of dI/dt disagree with those based upon central densities in a homologously contracting model. It is shown that the homologously contracting model leads to large errors in dI/dt. Based upon an integration of Sears's (1964) solar model, dI/dt is determined as -5.5 by 10 to the 34th power gm-sq cm/sec. This suggests a core angular velocity of about 0.00015 per sec, corresponding to a period of 0.5 + or - 0.1 day, assuming a constant angular velocity with time.

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