LONGTERM CHANGES OF SOLAR ACTIVITY ASYMMETRY

Journal Title: Odessa Astronomical Publications - Year 2015, Vol 28, Issue 2

Abstract

We report results of analysis of the northsouth asymmetry of solar activity, solar magnetic fields. The analysis is based on the sunspot data, 1875–2015 (http://solarscience.msfc.nasa.gov/greenwch.shtml), largescale solar magnetic field (solar mean magnetic field, SMMF) and solar polar magnetic field time series, 1975– 2015 (http://wso.stanford.edu). To study long-term changes of solar activity asymmetry we applied analysis of cumulative sum. Cumulative sum averages shortperiodic changes and identifies long-term periodicity. Minimum of cumulative sum of sunspot area mean monthly values time series occurs in ~1910, maximum – in ~1980. Perhaps this is branch growth of long-term (~140-years) cycle of solar activity asymmetry. Cumulative sums of polar magnetic field of different pole have ~22-years periodicity. Change of cumulative sum of SMMF time series has different character. But long-run trend with intervals of positive and (or) negative polarity of ~22 years is observed.

Authors and Affiliations

U. M. Leiko

Keywords

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  • EP ID EP603175
  • DOI -
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How To Cite

U. M. Leiko (2015). LONGTERM CHANGES OF SOLAR ACTIVITY ASYMMETRY. Odessa Astronomical Publications, 28(2), 264-267. https://europub.co.uk./articles/-A-603175