University of Oulu

Velinov, Peter I. Y.; Mishev, Alexander (2021) Influence of forbush effect on atmospheric ionization due to solar energtic particles. Comptes rendus de l’Académie bulgare des Sciences 74(6): 868-878.

Influence of forbush effect on atmospheric ionization due to solar energtic particles

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Author: Velinov, Peter I. Y.1; Mishev, Alexander2
Organizations: 1Institute for Space Research and Technology, Bulgarian Academy of Sciences, Akad. G. Bonchev St, Bl. 1, 1113 Sofia, Bulgaria
2Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 20.5 MB)
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Language: English
Published: Marin Drinov Academic Publishing House, 2021
Publish Date: 2021-07-02


High-energy precipitating particles of cosmic origin viz. cosmic ray (CR) protons of heavier nuclei of galactic and/or solar origin induce complicated nuclear-electromagnetic-lepton cascades in the Earth’s atmosphere, eventually leading to an ionization of the ambient air. The induced by CRs ionization is related to possible effect of precipitating particles on physico-chemical processes in the atmosphere. These effects can be considerably enhanced during solar proton events. While the contribution of galactic CRs to ion production in the atmosphere is slightly variable throughout a solar cycle, relativistic solar particles could produce a significant excess of electron-ion pair production, particularly over polar caps. This effect is strong on short time scales. On the other hand, depressions of the galactic CR flux, that is, Forbush decreases, can significantly impact on induced ionization. The sequence of three ground level enhancements (GLEs) 65, 66 and 67 in October-November 2003, specifically GLE 66 occurred during a giant Forbush decrease, provides unique opportunity to study impact ionization on enhanced manner and extended time scale, explicitly considering the reduced galactic CR flux. Using Monte Carlo simulations and appropriate solar proton spectra we computed the ion production rate and the corresponding ionization effect in the Earth atmosphere during GLE 66 which occurred on 29 October 2003.

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Series: Proceedings of the Bulgarian Academy of Sciences
ISSN: 1310-1331
ISSN-E: 2367-5535
ISSN-L: 1310-1331
Volume: 74
Issue: 6
Pages: 868 - 878
DOI: 10.7546/CRABS.2021.06.09
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work is supported by the Academy of Finland (project 330064 QUASARE, 321882 ESPERA). We acknowledge the International Space Science Institute support to International Team 441: High EneRgy sOlar partICle Events Analysis (HEROIC).
Academy of Finland Grant Number: 330064
Detailed Information: 330064 (Academy of Finland Funding decision)
321882 (Academy of Finland Funding decision)
Copyright information: © 2021 The Authors and BAN.