%A Carla Taricco
%A Narendra Bhandari
%A Paolo Colombetti
%A Alberto Romero
%A Neeharika Verma
%A Gianna Vivaldo
%K Sun: activity ? Meteoroids ? Cosmic rays ? Sun: magnetic fields ? Techniques: gamma spectroscopy ? Sunspots ? Interplanetary medium ? Solar-terrestrial relations
%D 2009
%L eprints2355
%X Many reconstructions of solar activity variations in the past are based on the measurement of cosmogenic isotopes (such as 14C and 10Be) stored in terrestrial archives. The concentration of these isotopes is however influenced by terrestrial phenomena. In order to avoid this problem our group is studying cosmogenic radioisotopes in meteorites at the underground laboratory of Monte dei Cappuccini in Torino (Italy). Measurement of 44Ti decay activity in 21 meteorites has revealed a centennial oscillation superimposed on a decreasing trend of the cosmic ray flux in the last 235 years. The decreasing trend is consistent with some models based on solar open magnetic field variations. We show some preliminary results obtained using a new acquisition system we have recently developed and set up in order to enhance selectivity of 44Ti detection.
%N 1
%J Memorie della Societ? Astronomica Italiana
%P 284-286
%T Reconstruction of solar activity variations in the past by measurement of cosmogenic radioisotopes in meteorites
%I Societ? Astronomica Italiana
%V 80