TY  - JOUR
VL  - 80
Y1  - 2009///
IS  - 1
JF  - Memorie della Società Astronomica Italiana
PB  - Società Astronomica Italiana
A1  - Taricco, Carla
A1  - Bhandari, Narendra
A1  - Colombetti, Paolo
A1  - Romero, Alberto
A1  - Verma, Neeharika
A1  - Vivaldo, Gianna
SP  - 284
ID  - eprints2355
EP  - 286
KW  - Sun: activity ? Meteoroids ? Cosmic rays ? Sun: magnetic fields ? Techniques: gamma spectroscopy ? Sunspots ? Interplanetary medium ? Solar-terrestrial relations
AV  - none
TI  - Reconstruction of solar activity variations in the past by measurement of cosmogenic radioisotopes in meteorites
UR  - http://eprints.imtlucca.it/2355/
SN  - 1824-016X
N2  - 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.
ER  -