Periodicity Analysis of Galactic Cosmic Rays Using Fourier, Hilbert, and Higher-Order Spectral Methods

First published: 2016

Brief summary

Fourier, Hilbert and bispectral analysis of ~50 years of cosmic-ray neutron monitor data finds periodicities from 9 days to 22 years, with nonlinear coupling between harmonics.

Article

Periodicity Analysis of Galactic Cosmic Rays Using Fourier, Hilbert, and Higher-Order Spectral Methods is a peer-reviewed journal article published by Astrophysics and Space Science (Springer) in 2016. It focuses on fourier, Hilbert and bispectral analysis of ~50 years of cosmic-ray neutron monitor data finds periodicities from 9 days to 22 years, with nonlinear coupling between harmonics.

Period range: 9 days to 22 years. The data source is worldwide neutron monitor network, ~50 years of data. It also considers bispectral analysis. This gives the cycle claim a specific numerical and evidential setting rather than presenting periodicity only as a visual impression.

The article reports the following result: Galactic cosmic rays exhibit a number of short- and long-term periodicities that vary between 9 days and 22 years, with bispectral analysis showing nonlinear coupling and complex phase relationships between harmonics. The interpretation is strongest when it survives red-noise modelling, uneven sampling, spectral-window effects and correction for the number of frequencies searched.

For cycles researchers, the article brings together galactic cosmic rays, periodicity analysis, fourier analysis, bispectral coupling. It is relevant to the detection and interpretation of periodic signals in astronomical observations, where sampling, red noise and instrumental effects can imitate or obscure genuine cycles.

Because it is a peer-reviewed journal article, the article is a strong starting point for discussion in the Cosmology & Astronomy forum, although its conclusions should still be compared with later replications and updated datasets.

Source details and credits

• Source / publisher: Astrophysics and Space Science (Springer)
• Source type: Peer-reviewed journal article
• URL type: WWW
• Credits: Astrophysics and Space Science (Springer)
• URL: https://link.springer.com/article/10.1007/s10509-016-2719-y