Temporal variation of cosmogenic nuclide Be-7 concentrations in atmosphere past 9-years from 2000

Abstract

In order to investigate relationships between cosmogenic nuclides and solar activities, we have been continuously observing the daily Be-7 concentrations in surface air using a high-volume air sampler. We have obtained the daily data set by the observation from 2000 to 2008, during which time the solar activities changing from the maximum of the 23rd solar cycle to the minimum of the next cycle. We report the result of the Be-7 variation in the 9 years compared with a simulation of production by cosmic rays.