Quasi-1500-year-cycle signal in length-of-day change

• Autorzy: Ma Lihua

Identyfikatory

DOI

10.2478/arsa-2021-0002

• Języki publikacji: EN

Abstrakty

EN

Length-of-day (LOD) change, i.e., variations in Earth’s rotation rate, includes the long-term slowdown trend, as well as periodic and irregular fluctuations. The current continuous sequence of the LOD change covers a time span of <400 years. Using astronomical records in ancient historical documents, combined with a modern astronomical ephemeris, it is possible to obtain ancient LOD change. Some scholars have given a discontinuous LOD data series for the past 4000 years. In this paper, the author uses the Lomb–Scargle periodogram to study the LOD series and finds a significant quasi-1500-yearcycle signal. Furthermore, with weighted wavelet Z-transform, time-varying characteristics of the cycle in the LOD change are obtained.

Słowa kluczowe

EN

length-of-day change; Lomb-Scargle periodogram; weighted wavelet Z-transform

• Wydawca: Centrum Badań Kosmicznych PAN ; De Gruyter
• Czasopismo: Artificial Satellites : Journal of Planetary Geodesy
• Rocznik: 2021
• Tom: Vol. 56, No. 2
• Strony: 10--17
• Opis fizyczny: Bibliogr. 20 poz., rys.

Twórcy

autor

Ma Lihua

• National Astronomical Observatories, Chinese Academy of Sciences, Beijing, P.R. China

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).