University of Oulu

Mishev, Alexander; Velinov, Peter I. Y. (2020) Ionization effect in the region of Regener–Pfotzer Maximum due to cosmic rays during halloween GLE events in October–November 2003. Comptes Rendus de l’Académie bulgare des Sciences 73(2): 244-251.

Ionization effect in the region of Regener–Pfotzer Maximum due to cosmic rays during halloween GLE events in October–November 2003

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Author: Mishev, Alexander1,2; Velinov, Peter I. Y.3
Organizations: 1Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
2Sodankyl¨a Geophysical Observatory, University of Oulu, Finland
3Institute for Space Research and Technology, Bulgarian Academy of Sciences, Acad. G. Bonchev St, Bl. 1, 1113 Sofia, Bulgaria
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 11.6 MB)
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Language: English
Published: Marin Drinov Academic Publishing House, 2020
Publish Date: 2020-04-15


One of the main drivers of the possible effect of cosmic ray particles on atmospheric physics and chemistry is connected to the Induced Atmospheric Ionization (IAI) due to high-energy precipitating particles. IAI by cosmic rays, which can be considerably enhanced during solar proton events, was extensively discussed over the last decade. In most of the recent models, IAI plays a key role on the physics and chemistry of the atmosphere, specifically on minor constituents. It is known that the contribution of galactic cosmic ray particles to ion production in the atmosphere is nearly constant, slightly influenced by the solar activity. On the other hand, the relativistic solar particles could produce a significant excess of ion pair production, particularly over polar caps. This effect is normally strong at short time scales. The sequence of three ground level enhancements GLE 65, 66 & 67 in October–November 2003 gives an unique opportunity to study impact ionization on enhanced manner and extended time scale. Using Monte Carlo simulation and derived solar proton spectra, we computed the ion production and the corresponding ionization effect in the Earth atmosphere in the region of Regener–Pfotzer maximum during the so-called Halloween events in October–November 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: 73
Issue: 2
Pages: 244 - 251
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work was supported by the Academy of Finland (project 307411, Center of Excellence ReSoLVE, HEAIM project 314982 and 316223).
Academy of Finland Grant Number: 307411
Detailed Information: 307411 (Academy of Finland Funding decision)
314982 (Academy of Finland Funding decision)
316223 (Academy of Finland Funding decision)
Copyright information: © 2020 The Authors and BAN.