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

Herbst, K. LU ; Muscheler, R. LU and Heber, B. (2017) In Journal of Geophysical Research: Space Physics 122(1). p.23-34
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... (More)

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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
cosmogenic radionuclides, galactic cosmic rays, solar modulation
in
Journal of Geophysical Research: Space Physics
volume
122
issue
1
pages
12 pages
external identifiers
  • scopus:85007573980
  • wos:000395655800002
ISSN
2169-9380
DOI
10.1002/2016JA023207
language
English
LU publication?
yes
id
659830b3-f777-45af-bc5f-e28f85fb38f3
date added to LUP
2017-03-17 10:53:10
date last changed
2018-03-18 05:10:59
@article{659830b3-f777-45af-bc5f-e28f85fb38f3,
  abstract     = {<p>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 <sup>10</sup>Be and <sup>14</sup>C, 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.</p>},
  author       = {Herbst, K. and Muscheler, R. and Heber, B.},
  issn         = {2169-9380},
  keyword      = {cosmogenic radionuclides,galactic cosmic rays,solar modulation},
  language     = {eng},
  month        = {01},
  number       = {1},
  pages        = {23--34},
  series       = {Journal of Geophysical Research: Space Physics},
  title        = {The new local interstellar spectra and their influence on the production rates of the cosmogenic radionuclides <sup>10</sup>Be and <sup>14</sup>C},
  url          = {http://dx.doi.org/10.1002/2016JA023207},
  volume       = {122},
  year         = {2017},
}