University of Oulu

Mishev, Alexander; Artamonov, Anton; Kovaltsov, Genady; Usoskin, Ilya 2017 Updated model CRAC : HEPII of atmospheric ionization due to high energy protons. 35th international cosmic ray conference, ICRC2017, The astroparticle physics conference. 12-20 July 2017, Bexco, Busan, Korea, Proceedings of Science PoS(ICRC2017)079, https://pos.sissa.it/301/079/pdf

Updated model CRAC : HEPII of atmospheric ionization due to high energy protons

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Author: Mishev, Alexander1; Artamonov, Anton1; Kovaltsov, Genady2;
Organizations: 1Space Climate Research Unit, University of Oulu, Finland
2Ioffe Physical-Technical Institute of Russian Academy of Sciences, St. Petersburg, Russia
3Space Climate Research Unit; Sodankylä Geophysical Observatory (Oulu unit), University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.5 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2017102650320
Language: English
Published: Sissa, 2017
Publish Date: 2017-10-26
Description:

Abstract

An extension of the CRAC model - CRAC:HEPII (Cosmic Ray Atmospheric Cascade: High Energy Proton Induced Ionization) is presented. The model allows one to compute the ion production by high energy protons entering the Earth’s atmosphere. The model is an extension of the CRAC:CRII model and it is focused on the upper part of the stratosphere and mesosphere. The model is also applicable in the low termosphere. The model is based on pre-computed with high statistics ionization yield functions. Therefore, the CRAC:HEPII model is based on a full Monte Carlo simulation of primary proton propagation and interaction with the atmosphere and explicitly considers various physical processes involved in ion production. All simulations were performed using the GEANT 4 simulation tool PLANETOCOSMICS with NRLMSISE 00 atmospheric model. The ionization yield function allows one to compute ion production due to various populations of primary protons in a wide energy range 100 keV – 20 GeV/nucleon for a given altitude, from about 6.5×10−9 g/cm2 (about 200 km a.s.l.) to the sea level considering a given primary proton spectrum. The spacial and height resolution of the model is improved compared to CRAC model. An application of the model for computation of ion production during ground level enhancement events is demonstrated. A quasi-analytical approach, which allows one to compute the ionization yields for events with arbitrary incidence is also presented.

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Series: Pos proceedings of science
ISSN: 1824-8039
ISSN-E: 1824-8039
ISSN-L: 1824-8039
Article number: 079
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 – ICRC217-10-20 July, 2017, Bexco, Busan, Korea
Type of Publication: B3 Article in conference pro-ceedings
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This work was supported by the Academy of Finland (project 272157, Center of Excellence ReSoLVE).
Academy of Finland Grant Number: 272157
Detailed Information: 272157 (Academy of Finland Funding decision)
Copyright information: © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).
  https://creativecommons.org/licenses/by-nc-nd/4.0/