Heliospheric modulation over the past 10,000 years as derived from cosmogenic nuclides

Neutron monitors have recorded variations in cosmic rays with high pre-cision and high temporal resolution for the past 50 years. However, sunspots and other solar proxies indicate that larger changes in heliospheric modulation are to be expected over longer time scales. Cosmogenic radionuclides pro...

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Bibliographic Details
Main Authors: J. Beer, M. V. Vonmoos, R. Muscheler, K. G. Mccracken, W. Mende
Other Authors: The Pennsylvania State University CiteSeerX Archives
Format: Text
Language:English
Published: Press 2003
Subjects:
ice core
Online Access:http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.550.1306
http://www-rccn.icrr.u-tokyo.ac.jp/icrc2003/PROCEEDINGS/PDF/1014.pdf
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Summary:Neutron monitors have recorded variations in cosmic rays with high pre-cision and high temporal resolution for the past 50 years. However, sunspots and other solar proxies indicate that larger changes in heliospheric modulation are to be expected over longer time scales. Cosmogenic radionuclides provide a tool to extend the neutron monitor records to at least 10,000 years, but with a much coarser temporal resolution (>1 y) and a lower signal to noise ratio. Using the 10Be record from the GISP2 ice core it is shown how the geomagnetic modulation component is removed, and the remaining 10Be signal interpreted in terms of the heliospheric modulation parameter Φ. 1.

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