Affiliation:
1. Faculty of Physics, Kim Il Sung University, DPR Korea
Abstract
Abstract
We show that while the Fourier transform can figure only an “intensity” of a periodic signal, there is an additional information embedded, which is a “coherence” of the signal. Supposing that the periodicity is reflected only on the “coherence,” we introduce a time stability as a measure of “coherence” excluding the “intensity,” i.e. amplitude of signal. In stead of classical strength-based significance, where strength implies the power or amplitude, we adopt a stability-based significance as criterion to choose cycles in a random signal. We inspect the time-stable solar periodicities and show that most periodicities discovered in exterior solar activities such as the solar wind inhere in interior solar activity such as the sunspot and that the time stability can be an effective tool in spectral analysis of stochastic solar activity.
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
1 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
1. A history of solar activity over millennia;Living Reviews in Solar Physics;2023-05-05