Bulletin of the Russian Academy of Sciences: Physics

, Volume 71, Issue 7, pp 1014-1017

First online:

200-year variations in cosmic rays modulated by solar activity and their climatic response

  • O. M. RaspopovAffiliated withSt. Petersburg Filial of the Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences
  • , V. A. DergachevAffiliated withIoffe Physicotechnical Institute, Russian Academy of Sciences

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Manifestation of the 200-year solar cycle (de Vries cycle) in climatic changes (summer temperatures) has been investigated by analyzing the radial growth of long-lived (800–1200 yr) Juniperus turkestanica trees in Central Asia. Quasi-two-hundred-year variations in the radial growth of trees have been revealed, which correlate well (correlation coefficient reaches 0.94) with similar solar activity variations (Δ14C).