Manifestation of Solar-Activity Cycles in the Rhythms of the Lacustrine Banded Clay of the Late Pleistocene and the Modern Era

Autor: V. A. Dergachev, Marta Tyasto, P. B. Dmitriev
Rok vydání: 2020
Předmět:
Zdroj: Geomagnetism and Aeronomy. 60:1146-1151
ISSN: 1555-645X
0016-7932
DOI: 10.1134/s001679322008006x
Popis: The paper considers the ratio between the spectral and time structures of solar activity, which consists of five main cycles (Schwabe, Hale, Brueckner, Gleissberg, and Suess-deVries) and the rhythms of banded clays in thirteen samples from the National Oceanic and Atmospheric Administration database, which date back to the Late Pleistocene (~15 000 years ago) and the modern era (from 3000 BC to the present). It is shown that there is no systematic shift in the values of the solar-activity cycles relative to the corresponding periods of the cyclic components in the banded clays, and there is only a partial coincidence (from 33% to 78%) of the former with the latter, depending on the value of their periods. Moreover, 5- to 7-year cycles are observed in ten samples of banded clays, which lately has been attributed to the El Nino phenomenon.
Databáze: OpenAIRE
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