Active picture of rotation

Details Active picture of rotation Active picture of rotation

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108....7a&link_type=abstract

Astronomy and Astrophysics, vol. 108, no. 1, Apr. 1982, p. 7-13.

Astronomy and Astrophysics

Astrophysics

16

Energy Transfer, Kelvin-Helmholtz Instability, Stellar Rotation, Wave Excitation, Wave Interaction, Angular Momentum, Convective Flow, Oscillating Flow, Reynolds Stress, Rotating Bodies, Thermodynamics

Scientific paper

The interaction between waves and rotation is examined, with an estimate made of the Reynolds stress. It is found that, in weakly differential rotation, waves (including oscillatory convection) excited by such thermal processes as a kappa mechanism can transfer their energy to rotational energy; this means that they can strengthen the differential rotation and that, in the case of strongly differential rotation, the rotation can release its energy to excite waves arising from the Kelvin-Helmholtz instability and thus cancel the differential rotation. Combining these two extreme cases in an active way, an active rotation cycle in the rotating system is proposed. This means that, in weakly differential rotation, waves excited by processes other than rotation can carry angular momentum to promote the differential rotation, in this way, the differential rotation gradually becomes strong in some parts.

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