University of Oulu

Poluianov, Stepan; Kovaltsov, Gennady; Usoskin, Ilya 2017 The energetic particle intensity estimated from cosmogenic isotope Al-26 produced in lunar samples. 35th international cosmic ray conference, ICRC2017, The astroparticle physics conference. 12-20 July 2017, Bexco, Busan, Korea, PoS(ICRC2017)123, https://pos.sissa.it/301/123/pdf

The energetic particle intensity estimated from cosmogenic isotope Al-26 produced in lunar samples

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Author: Poluianov, Stepan1,2; Kovaltsov, Gennady3; Usoskin, Ilya1,2
Organizations: 1Space Climate Research Unit, University of Oulu, Finland
2Sodankylä Geophysical Observatory, University of Oulu, Finland
3Ioffe Physical-Technical Institute, St. Petersburg, Russia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2017110150452
Language: English
Published: Sissa, 2017
Publish Date: 2017-11-01
Description:

Abstract

Direct measurements of solar energetic particles (SEP) became possible only in the space era covering past several decades. However, for many academic and practical reasons, it is important to know the SEP energy spectrum on much longer time scales in the past. Such information can be obtained using reconstructions based on cosmogenic radioisotope measurements in extra-terrestrial objects without magnetic and atmospheric shielding such as lunar surface or meteoroids. Thanks to the Apollo missions, samples of lunar rocks have been brought to the Earth and measured for the isotope content. Although estimates of the average SEP energy spectrum from cosmogenic radionuclides measured in lunar samples have been made earlier, here we revisit the approach using newly calculated depth profile of the yield function for 26Al in lunar rocks. We have developed a full Monte-Carlo model of the nuclide production by energetic particles in the rock. As a result, we present the improved estimate of the average solar energetic particle intensity at 1 AU on the multi-millenial time scales.

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Series: Pos proceedings of science
ISSN: 1824-8039
ISSN-E: 1824-8039
ISSN-L: 1824-8039
Article number: 123
Host publication: 35th international cosmic ray conference, ICRC2017, The astroparticle physics conference. 12-20 July 2017, Bexco, Busan, Korea
Conference: 35th International Cosmic Ray Conference – ICRC217-12-20 July, 2017, Bexco, Busan, Korea
Type of Publication: B3 Article in conference pro-ceedings
Field of Science: 115 Astronomy and space science
Subjects:
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