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

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

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 corr...

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Veröffentlicht in:Geophysical research letters 2010-08, Vol.37 (15), p.n/a
Hauptverfasser: Le Mouël, Jean-Louis, Blanter, Elena, Shnirman, Mikhail, Courtillot, Vincent
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Sprache:eng
Schlagworte:
Annual variations
Climate change
Cosmic rays
Cryosphere
Earth
Geodetics
length of day
Ocean-atmosphere interaction
Sciences of the Universe
semi-annual line
Solar activity
solar forcing
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creator Le Mouël, Jean-Louis
Blanter, Elena
Shnirman, Mikhail
Courtillot, Vincent
description 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.
doi_str_mv 10.1029/2010GL043185
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subjects Annual variations
Climate change
Cosmic rays
Cryosphere
Earth
Geodetics
length of day
Ocean-atmosphere interaction
Sciences of the Universe
semi-annual line
Solar activity
solar forcing
title Solar forcing of the semi-annual variation of length-of-day
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