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

K. Herbst, R. Muscheler, B. Heber

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)23-34
Number of pages12
JournalJournal of Geophysical Research: Space Physics
Volume122
Issue number1
DOIs
Publication statusPublished - 2017 Jan 1

Subject classification (UKÄ)

  • Fusion, Plasma and Space Physics
  • Geosciences, Multidisciplinary

Free keywords

  • cosmogenic radionuclides
  • galactic cosmic rays
  • solar modulation

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