Manifestations of solar activity and short-period variations of the duration of the earth day

Details Manifestations of solar activity and short-period variations of the duration of the earth day Manifestations of solar activity and short-period variations of the duration of the earth day

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992azh....69.1303l&link_type=abstract

Astronomicheskij Zhurnal (ISSN 0004-6299), vol. 69, no. 6, p. 1303-1312.

Astronomy and Astrophysics

Astronomy

Angular Momentum, Earth Atmosphere, Earth Movements, Periodic Variations, Solar Activity Effects, Solar Radio Emission, Diurnal Variations, Fast Fourier Transformations, Ultraviolet Radiation

Scientific paper

The effect of solar activity on velocity fluctuations of the earth's diurnal motion and angular (kinetic) momentum of the earth atmosphere is investigated. The FFT method is used to calculate the power spectrum for the variations in the length of day (LOD), atmospheric angular momentum (AAM), and for some indices of solar activity on a 20-200-d time scale. The obtained results argue in favor of the wave hypothesis as the source of the influence of solar activity on the AAM and LOD (e.g., through UV radiation and ozone), rather than the corpuscular one, when the solar wind is assumed to be the main cause.

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