Early 18th century cosmic ray flux inferred from 44Ti in Agen meteorite

被引：0

作者：

C. Taricco

N. Sinha

N. Bhandari

P. Colombetti

S. Mancuso

S. Rubinetti

D. Barghini

机构：

[1] Università di Torino,Dipartimento di Fisica

[2] Osservatorio Astrofisico di Torino,Istituto Nazionale di Astrofisica

[3] Wentworth Institute of Technology,Physical Research Laboratory

[4] Basic Sciences Research Institute,undefined

来源：

Astrophysics and Space Science | 2016年 / 361卷

关键词：

Meteorites; Cosmogenic radionuclides; Solar activity—methods: gamma-ray spectrometry;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

We report the measurement of radioactivity of cosmogenic 44Ti in Agen meteorite, a H5 chondrite that fell in 1814. The 44Ti activity in meteorites is related to centennial-scale changes in cosmic ray intensity caused by heliospheric magnetic field modulation in the interplanetary space between heliocentric distances of 1 and 3 AU. The measured low 44Ti activity in Agen suggests a strong modulation of galactic cosmic rays at the turn of the 18th century, resulting in a low cosmic ray flux and is consistent with the linearly decreasing trend of GCR flux, modulated by the Gleissberg solar cycle during the past 250 years, as previously suggested by us.

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