Solar forcing of the semi-annual variation of length-of-day

Details Solar forcing of the semi-annual variation of length-of-day Solar forcing of the semi-annual variation of length-of-day

Aug 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3715307l&link_type=abstract

Geophysical Research Letters, Volume 37, Issue 15, CiteID L15307

Physics

2

Geodesy And Gravity: Earth Rotation Variations, Geodesy And Gravity: Ocean/Earth/Atmosphere/Hydrosphere/Cryosphere Interactions (0762, 1218, 3319, 4550), Geodesy And Gravity: Atmosphere Monitoring With Geodetic Techniques (6952), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Solar Variability (7537)

Scientific paper

We study the evolution of the amplitude A of the semi-annual variation of the length-of-day (lod) from 1962 to 2009. We show that A is strongly modulated (up to 30%) by the 11-yr cycle monitored by the sunspot number WN. A and WN are anticorrelated, WN leading A by 1-yr. A is therefore directly correlated with galactic cosmic ray intensity. The main part of the semi-annual variation in lod is due to the variation in mean zonal winds. We conclude that variations in mean zonal winds are modulated by the solar activity cycle through variations in irradiance, solar wind or cosmic ray intensity.

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