Atmospheric Effects on the Earth’s Rotation

  • H. Volland

Abstract

The atmosphere as the outer volatile region of the Earth is directly exposed to solar radiation. It is also connected to the solar wind via interaction with the geomagnetic field and the magnetospheric plasma. The atmospheric wind blowing over the rough surface can exchange angular momentum with the solid Earth. On a short-term scale (days to years), fluctuations of the angular momentum vector give rise to variations in the length of the day (LOD) and changes in the polar motion. Secular variations of the LOD may be partly due to a solar gravitational torque acting on the thermally excited semidiurnal density bulge on the ground. The frictional force between the magnetopause and the solar wind may be capable of braking the Earth’s rotation. In this paper, I estimate the various effects of atmospheric motions which may induce short-term and long-term changes in the Earth’s rotation.

Keywords

Convection Torque Hines 

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Copyright information

© Springer-Verlag Berlin Heidelberg 1990

Authors and Affiliations

  • H. Volland
    • 1
  1. 1.Radioastronomisches InstitutUniversität BonnBonn 1Germany

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