Short-period geomagnetic, atmospheric and earth-rotation variations

Details Short-period geomagnetic, atmospheric and earth-rotation variations Short-period geomagnetic, atmospheric and earth-rotation variations

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...118...26d&link_type=abstract

Astronomy and Astrophysics, vol. 118, no. 1, Feb. 1983, p. 26-28.

Astronomy and Astrophysics

Astrophysics

10

Earth Atmosphere, Earth Rotation, Geomagnetism, Periodic Variations, Solar Activity Effects, Solar Terrestrial Interactions, Angular Momentum, Angular Velocity, Indexes (Ratios), Synoptic Measurement, Time Dependence, Universal Time

Scientific paper

Cyclic variations of 3 and 4-months in UT2-TAI, geomagnetic index Ap and the zonal component of the global atmospheric angular momentum (AM) have been identified. The existence of the common 3 and 4-month variation represents an argument in favor of the hypothesis that solar activity contributes to the angular velocity of the Earth's rotation (ω) variations. The 55-d variation of AM and UT2-TAI is confirmed. It is estimated that 90-95% of the observed amplitude of the three mentioned variations are explicable by the AM variation. Between the irregular changes of Ap and the corresponding dω/ω a statistical dependence is not identified.

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