Long-term heliomagnetic field variation based on cosmogenic 44Ti in meteorites

Mancuso, S. and Taricco, C. and Colombetti, P. and Rubinetti, S. and Sinha, N. and Bhandari, N. and Barghini, D. and Gardiol, D. (2019) Long-term heliomagnetic field variation based on cosmogenic 44Ti in meteorites. Il nuovo cimento C, 42 (1). pp. 1-4. ISSN 1826-9885

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Reconstructions of the heliospheric magnetic field (HMF) in the past centuries are mainly based on the analysis of sunspot activity, geomagnetic data or on measurement of cosmogenic radioisotopes stored in terrestrial reservoirs (tree rings and ice cores). There are, however, significant discrepancies among the results obtained by various techniques using different proxies of solar magnetic activity. In this work, new results obtained from a unique approach based on the measurement of the cosmogenic 44Ti activity detected in meteorites are presented and compared with the most recent reconstructions of the near-Earth HMF strength. The very low level of 44Ti activity in several meteorites fallen in the last 250 years was determined by using gamma-ray spectrometers (HPGe+NaI) located in the underground laboratory of Monte dei Cappuccini (INAF-OATo) in Torino, Italy. This approach, specifically designed to overcome the main problems affecting other methods, yields a powerful independent tool to reconstruct the long-term evolution of the HMF through the last two and a half centuries.

Item Type: Article
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 27 Nov 2020 14:20
Last Modified: 27 Nov 2020 14:20
URI: http://eprints.bice.rm.cnr.it/id/eprint/20411

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