On the decade fluctuation of the acceleration of the Earth's rotation.

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  • 地球自転速度のdecade fluctuationについて
  • 地球自転加速度のdecade fluctuationについて〔英文〕
  • チキュウ ジテン カソクド ノ decade fluctuation ニ ツイ

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The decade fluctuation of the acceleration of the Earth's rotation is repeated almost periodically with period about 25 years. Its semi-amplitude is about 0.1 s⋅yr-2. The power spectrum of its variation has low values for the frequencies between (3 yr)-1=0.33 yr-1 and (12.5 yr)-1=0.08 yr-1. Therefore, we can imagine that the causes of the fluctuation are divided into two parts by this frequency interval.

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