A Wavelet-Based Approach to Solar-Terrestrial Coupling
First published: 2016
Brief summary
Uses continuous wavelet transform and cross-wavelet spectra to identify shared periodicities between solar wind drivers (coronal mass ejections, co-rotating interaction regions) and geomagnetic disturbance indices, spanning periods from 27 days to the 11/22-year solar cycle.
Article
A Wavelet-Based Approach to Solar-Terrestrial Coupling is a preprint published by arXiv in 2016. It uses continuous wavelet transform and cross-wavelet spectra to identify shared periodicities between solar wind drivers (coronal mass ejections, co-rotating interaction regions) and geomagnetic disturbance indices, spanning periods from 27 days to the 11/22-year solar cycle.
The analysis focuses on ~27 days (solar rotation), 13.5, 9.1, 6.8 days (rotation harmonics), 187/273/364 days, 11/22 years (solar cycle). It also considers cross-wavelet transform and wavelet coherence methodology bridging solar physics and geomagnetism. 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: The solar-geomagnetic coupling, when studied in the frequency plane, manifests itself with periodic terms having the same periodicity in the solar drivers and the geomagnetic indices time series, with the basic periodicity being the 11/22 year solar cycle. The interpretation is strongest when the same cycle definition and statistical standard can be applied consistently across the different fields being compared.
For cycles researchers, the article brings together solar-terrestrial coupling, wavelet coherence, solar wind, geomagnetic activity. It is relevant to comparative cycles research because it links periodic behaviour across disciplines and encourages common methods for testing recurrence, phase and causation.
Because it is a preprint, the work should be read alongside later peer-reviewed publications and independent replications. It remains useful because the proposed cycle, dataset and analytical approach are stated clearly enough to be scrutinised.
Source details and credits
- Source / publisher: arXiv
- Source type: Preprint
- URL type: PDF
- Credits: arXiv
- URL: https://arxiv.org/pdf/1605.04005