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    A Supernova Shock Ensemble Model Using Vostok 10Be Radioactivity

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    Author
    Sonett, C. P.
    Issue Date
    1992-01-01
    Keywords
    particle tracks
    Vostok Station
    cosmochronology
    cosmochemistry
    Antarctica
    O 18 O 16
    ice sheets
    oxygen
    Be 10
    alkaline earth metals
    beryllium
    metals
    isotopes
    radioactive isotopes
    stable isotopes
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    Citation
    Sonett, C. P. (1992). A supernova shock ensemble model using Vostok 10Be radioactivity. Radiocarbon, 34(2), 239-245.
    Publisher
    Department of Geosciences, The University of Arizona
    Journal
    Radiocarbon
    URI
    http://hdl.handle.net/10150/653227
    DOI
    10.1017/S0033822200013680
    Additional Links
    http://radiocarbon.webhost.uits.arizona.edu/
    Abstract
    Analysis of the Vostok ice-core record of 10Be (Raisbeck et al. 1987) suggests that the sharply resolved increases in 10Be at 35 ka (kyr) and 60 ka are due to cosmic-ray (CR) increases. As an alternate to long-term solar modulation or strong decreases in the Earth's magnetic field, supernova (SN) forcing is qualitatively consistent with the generation of a forward-reverse shock ensemble from a spherical blast wave of age very approximately at 75 ka. This age agrees with Davelaar, Bleeker and Deerenberg's (1980) identification of 75 ka for the age of a North Polar Spur SN remnant. Confirmation would be the first geochemical detection of supernova forcing of spallogenic and perhaps cosmogenic isotope production in the atmosphere. The three 10Be increases can be satisfied by a modification of the Sonett, Morfill, and Jokipii (1987) model. This consists of 2 or 3 shock waves from a single SN event, which includes the first stage in the expansion, leading to a forward shock, S1+, and a pair of reverse waves, S1− and S2−. One reverse wave arises from the spherical expansion, itself, and the other is a reflected wave from a remnant precursor shell boundary from a more ancient SN. The model requires the solar system to be immersed in the ‘bubble’ of the earlier post-SN evolution, possibly affecting estimates of heliospheric boundary distance. However more recent analysis of Camp Century ice core data discloses only the 35 ka 10Be peak. This recent result compounds the difficulty of constructing a completely consistent model for the source of the Vostok spikes. This paper is written in the spirit of suggesting only one of possibly several different models, even within the subclass of SN models.
    Type
    Article
    text
    Language
    en
    ISSN
    0033-8222
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0033822200013680
    Scopus Count
    Collections
    Radiocarbon, Volume 34, Number 2 (1992)

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