The Cosmic Ray Increases at 35 and 60 Kyr BP
dc.contributor.author | Florinski, V. | |
dc.contributor.author | Axford, W. I. | |
dc.contributor.author | Zank, G. P. | |
dc.date.accessioned | 2021-02-11T21:46:23Z | |
dc.date.available | 2021-02-11T21:46:23Z | |
dc.date.issued | 2004-01-01 | |
dc.identifier.citation | Florinski, V., Axford, W. I., & Zank, G. P. (2004). The cosmic ray increases at 35 and 60 kyr BP. Radiocarbon, 46(2), 683-690. | |
dc.identifier.issn | 0033-8222 | |
dc.identifier.doi | 10.1017/S0033822200035736 | |
dc.identifier.uri | http://hdl.handle.net/10150/654969 | |
dc.description | From the 18th International Radiocarbon Conference held in Wellington, New Zealand, September 1-5, 2003. | |
dc.description.abstract | Concentrations of 10Be in ice cores and marine sediments exhibit 2 peaks with significant enhancements at 35,000 and 60,000 BP. This radioisotope is produced in the upper atmosphere by spallation of cosmic-ray protons and secondary neutrons on atmospheric nitrogen and oxygen. Previously suggested explanations for the increases include geomagnetic field reversals, a decrease in solar activity, and a supernova explosion. We propose an alternative explanation which involves a change in the galactic environment of the solar system. The structure of the heliosphere is investigated for a period when the Sun enters a cold, dense, unmagnetized interstellar cloud. Under these conditions, the heliosphere contracts to 25% its present size, significantly affecting galactic cosmic ray modulation and increasing anomalous cosmic ray fluxes. A tenfold increase in anomalous cosmic ray flux and a twofold increase in galactic cosmic ray intensity at Earth are possible in this high-density case if heliosheath modulation is reduced. We show that this increase in galactic cosmic ray intensity could be responsible for the peaks in 110Be records. | |
dc.language.iso | en | |
dc.publisher | Department of Geosciences, The University of Arizona | |
dc.relation.url | http://radiocarbon.webhost.uits.arizona.edu/ | |
dc.rights | Copyright © by the Arizona Board of Regents on behalf of the University of Arizona. All rights reserved. | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | alkaline earth metals | |
dc.subject | Antarctica | |
dc.subject | Arctic region | |
dc.subject | Be 10 | |
dc.subject | beryllium | |
dc.subject | California | |
dc.subject | Cenozoic | |
dc.subject | concentration | |
dc.subject | cores | |
dc.subject | correlation | |
dc.subject | cosmic rays | |
dc.subject | global | |
dc.subject | Greenland | |
dc.subject | Holocene | |
dc.subject | ice cores | |
dc.subject | isotopes | |
dc.subject | marine sediments | |
dc.subject | Mediterranean Sea | |
dc.subject | metals | |
dc.subject | models | |
dc.subject | Mono County California | |
dc.subject | Mono Lake | |
dc.subject | paleoenvironment | |
dc.subject | Quaternary | |
dc.subject | radioactive isotopes | |
dc.subject | sediments | |
dc.subject | solar activity | |
dc.subject | solar wind | |
dc.subject | Sun | |
dc.subject | United States | |
dc.subject | variations | |
dc.title | The Cosmic Ray Increases at 35 and 60 Kyr BP | |
dc.type | Proceedings | |
dc.type | text | |
dc.identifier.journal | Radiocarbon | |
dc.description.collectioninformation | The Radiocarbon archives are made available by Radiocarbon and the University of Arizona Libraries. Contact lbry-journals@email.arizona.edu for further information. | |
dc.eprint.version | Final published version | |
dc.description.admin-note | Migrated from OJS platform February 2021 | |
dc.source.volume | 46 | |
dc.source.issue | 2 | |
dc.source.beginpage | 683 | |
dc.source.endpage | 690 | |
refterms.dateFOA | 2021-02-11T21:46:23Z |