7Be VARIATION IN MONTHLY ATMOSPHERIC PRECIPITATION IN 2002-2005 IN SAMARKAND

摘要

Be (r^ = 54 days, Ey = 478 keV, a., = 10.3% per decay) is produced in the upper layers of the Earth's atmosphere in reactions where cosmic rays split 16O and 14N nuclei. In addition, 7Be nuclei formed as a result of the fragmentation of heavy nuclei and in thermonuclear fusion reactions 3He + He = 7Be + y on the surface of the Sun and in other parts of the Universe penetrate into enter the Earth's atmosphere. Be ions stick to aerosols and are transported together with them into the lower layers of the atmosphere whence they fall with wet (rain, sleet, snow) and dry (dust, dew) precipitation onto the Earth' surface. Studies performed over many years in different regions of the Earth have established that the Be concentration in the air layer at the ground is correlated with solar activity and the local physical-geographic characteristics while for atmospheric precipitation there is a correlation with the amount of the wet precipitation [1-4]. Systematic studies of monthly atmospheric precipitation of 7Be in Samarkand began in 2002 [5-7].