Spectral Analysis of Solar and Geomagnetic Parameters in Relation to Cosmic-ray Intensity (1965-2018)
First published: 2019
Brief summary
Fourier and wavelet analysis of solar, geomagnetic and cosmic-ray data over five solar cycles identifies periodicities from days to years, including the 11-year solar cycle and 27-day solar rotation.
Article
Spectral Analysis of Solar and Geomagnetic Parameters in Relation to Cosmic-ray Intensity (1965-2018) is a peer-reviewed journal article published by Solar Physics (Springer) in 2019. It uses Fourier and wavelet analysis of solar, geomagnetic and cosmic-ray data over five solar cycles to identify periodicities from days to years, including the 11-year solar cycle and 27-day solar rotation.
The analysis focuses on 27 days, 6, 9, 13.9 days, 5.5 years, 1.3 & 1.7 years, 11 years. It also considers FFT and wavelet analysis on 1965-2018 data across 5 solar cycles. 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: Spectral analysis of solar and geomagnetic parameters as well as cosmic-ray intensity was performed using fast Fourier transformation and wavelet analysis, identifying the well-known 11-year and 27-day periods along with several shorter 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 solar activity cycles, geomagnetic parameters, cosmic-ray intensity, fourier and wavelet analysis. 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: Solar Physics (Springer)
- Source type: Peer-reviewed journal article
- URL type: WWW
- Credits: Solar Physics (Springer)
- URL: https://link.springer.com/article/10.1007/s11207-019-1403-0