Study of the cosmogenic factors influence on temporal variation of Be-7 air concentration during the 23rd solar cycle in Malaga (South Spain)

摘要

Atmospheric Be-7 activity concentrations were measured in Malaga (South Spain) during the period 1997-2007. Monthly concentrations of Be-7 ranged between 2.47 and 8.12 mBq m(-3) showing seasonal trend with maxima in spring-summer time. Influence of solar activity, cosmic rays and aerosol optical depth on airborne Be-7 was analyzed. Weak negative correlation between sunspot number and Be-7 is found. Instead, both solar energetic protons > 100 MeV and cosmic rays show positive weak significant correlation with this radionuclide. Meteorology may contribute to the low correlation coefficients found. Aerosol optical depth exhibits significant correlation with Be-7, confirming that this radionuclide attaches to atmospheric particles.