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Spectral characteristic of mid-term quasi-periodicities in sunspots data View all abstracts by submitter

Valery Pipin   Submitted: 2019-11-21 00:26

Numerous analyses suggest the existence of various quasi-periodicities in solar activity. The power spectrum of solar activity recorded in sunspot data is dominated by the ∼11-year quasi-periodicity, known as the Schwabe cycle. In the mid-term range (1 month - 11 years) a pronounced variability known as a quasi-biennial oscillation (QBO) is widely discussed. In the shorter time scale a pronounced peak, corresponding to the synodic solar rotation period (∼ 27 days) is observed. Here we revisited the mid-term solar variability in terms of statistical dynamic of fully turbulent systems, where solid arguments are required to accept an isolated dominant frequency in a continuous (smooth) spectrum. For that, we first undertook an unbiased analysis of the standard solar data, sunspot numbers and the F10.7 solar radioflux index, by applying a wavelet tool, which allows one to perform a frequency-time analysis of the signal. Considering the spectral dynamics of solar activity cycle by cycle, we showed that no single periodicity can be separated, in a statistically significant manner, in the specified range of periods. We examine whether a model of solar dynamo can reproduce the mid-term oscillation pattern observed in solar data. We found that a realistically observed spectrum can be explained if small spatial (but not temporal) scales are effectively smoothed. This result is important because solar activity is a it global feature, although monitored via small-scale tracers like sunspots.

Authors: P. Frick, D. Sokoloff, R. Stepanov, V. Pipin, I. Usoskin
Projects: Other

Publication Status: accepted in MNRAS
Last Modified: 2019-11-21 14:53
Go to main E-Print page  Measuring relative abundances in the solar corona with optimised linear combinations of spectral lines  On the Origin of Solar Torsional Oscillations and Extended Solar Cycle  Edit Entry  Download Preprint  Delete Entry 

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