New evidence of space weather impact on weather and climate in southern hemisphere

Details New evidence of space weather impact on weather and climate in southern hemisphere New evidence of space weather impact on weather and climate in southern hemisphere

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4153p&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

Data on liquid precipitation in Brazil for three meteorological stations in Pelotas, Campinas, and Fortaleza from 1849 up to 2000 were considered in this study. These stations span practically the entire latitude range of Brazil. Periodic analysis of the annual rainfall level in Pelotas and in Fortaleza shows a pronounced bidecadal periodicity that extended for about 100-150 years with great variation amplitude of about 90%. Assuming a phase change hypothesis, correlation/anti-correlation with the 22-year solar magnetic field cycle was revealed in the rainfall data from both Fortaleza and Pelotas stations (Figures 1,2). Correlation of rainfall variations with 24-year periodicity characteristic for ocean-atmospheric coupling process independent directly on solar cycle is +54.6% in Fortaleza during 18492000. Short term correlation of Brazilian rainfall level with magnetic sector boundary of interplanetary magnetic field crossing by Earth, with solar flare energetic charged particle events, with Forbush decreases in cosmic rays during ~50 years of observations were searched for. The results appear to have bearing both as a scientific instrument for the solution of the sun-weather connection problem and possibly for long term practical forecasting in the South American region and elsewhere.

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