Hilbert transform analysis of the Elatina varve record of solar activity

Details Hilbert transform analysis of the Elatina varve record of solar activity Hilbert transform analysis of the Elatina varve record of solar activity

Publishing date

Dec 1986

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..457b&link_type=abstract

Journals

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 1, 1986, p. 457-468. CSIRO-NSF-supported rese

Science

Astronomy and Astrophysics

Field

Astronomy

Additional info 2

9

Additional info 3

Hilbert Transformation, Sedimentary Rocks, Solar Activity, Solar Terrestrial Interactions, Frequency Stability, Modulation, Nonlinearity, Solar Cycles, Sunspots, Time Series Analysis

Type

Scientific paper

Abstract

A sequence of 1337 annual laminae, or varves, from the late-Precambrian Elatina Formation in South Australia has been subjected to spectral analysis by a simplifying technique of Hilbert transformation previously used successfully on the sunspot number series. In the depth interval between one thin varve and the next, which will be referred to as a varve cycle, there are 12±4 varves of regularly increasing and then diminishing thickness. Also conspicuous is a 'zig-zag' effect, an inequality of the thickness of consecutive varve cycles. The analysis confirms the presence of (1) an additive undulation with period of TU = 350 varve yr associated with the zig-zag effect and (2) non-sinusoidal amplitude modulation with a period of TE = 314 varve yr known as the Elatina Cycle.

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