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The new local interstellar spectra and their influence on the production rates of the cosmogenic radionuclides 10Be and 14C

Author:
  • K. Herbst
  • R. Muscheler
  • B. Heber
Publishing year: 2017-01-01
Language: English
Pages: 23-34
Publication/Series: Journal of Geophysical Research: Space Physics
Volume: 122
Issue: 1
Document type: Journal article

Abstract english

With Voyager1 crossing the outer boundary of our solar system at the end of 2012, for the first time in the instrumental era an unmodulated local interstellar spectrum (LIS) at galactic particle energies below ~500 MeV has been measured. On the basis of these as well as Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (PAMELA) and Alpha Magnetic Spectrometer (AMS02) measurements, most recently, three new LIS models have been proposed in the literature. In this study we compare the newest LIS models to previously most often used ones. Thereby, we investigate and discuss the influence of these LIS models on the terrestrial production rates of the cosmogenic radionuclides 10Be and 14C, which are produced due to the interaction of galactic and solar cosmic rays with atmospheric constituents. After being transported within the atmosphere they are preserved in natural archives such as, e.g., ice sheets or tree rings, forming a unique tool to study the solar modulation of thousands of years back in time. To parameterize the heliospheric modulation we apply the force-field approximation for the individual LIS models from which LIS-dependent solar modulation parameter (ϕ) values are derived. Furthermore, we present updated sets of linear regression functions containing the opportunity to convert the LIS-dependent ϕ values between the investigated LIS models. The results are then applied to a long-term reconstruction of the solar modulation parameter.

Keywords

  • Fusion, Plasma and Space Physics
  • Geosciences, Multidisciplinary
  • cosmogenic radionuclides
  • galactic cosmic rays
  • solar modulation

Other

Published
  • ISSN: 2169-9380
Raimund Muscheler
E-mail: raimund.muscheler [at] geol.lu.se

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Quaternary Sciences

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