Solar Cycle Signal in Earth Rotation: Nonstationary Behavior

Details Solar Cycle Signal in Earth Rotation: Nonstationary Behavior Solar Cycle Signal in Earth Rotation: Nonstationary Behavior

Jan 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981sci...211..386c&link_type=abstract

Science, Volume 211, Issue 4480, pp. 386-389

Physics

25

Scientific paper

Following the discovery of the 11-year solar cycle signal in earth rotation, linear techniques were employed to investigate the amplitude and phase of the difference between ephemeris time and universal time (Δ T) as a function of time. The amplitude is nonstationary. This difference was related to Δ (LOD), the difference between the length of day and its nominal value. The 11-year term in Δ (LOD) was 0.8 millisecond at the close of the 18th century and decreased below noise level from 1840 to 1860. From 1875 to 1925, Δ (LOD) was about 0.16 millisecond, and it decreased to about 0.08 millisecond by the 1950's. Except for anomalous behavior from 1797 to 1838, Δ T lags sunspot numbers by 3.0 ± 0.4 years. Since Δ T lags Δ (LOD) by 2.7 years, the result is that Δ (LOD) is approximately in phase with sunspot numbers.

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