University of Oulu

Koldobskiy, S., Raukunen, O., Vainio, R., Kovaltsov, G., & Usoskin, I. (2021, July 5). New reconstruction of the event-integrated spectra for GLE events. Proceedings of 37th International Cosmic Ray Conference — PoS(ICRC2021). 37th International Cosmic Ray Conference. https://doi.org/10.22323/1.395.1273

New reconstruction of the event-integrated spectra for GLE events

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Author: Koldobskiy, Sergey1,2; Raukunen, Osku3; Vainio, Rami3;
Organizations: 1University of Oulu, Finland
2National Research Nuclear University MEPhI, Moscow, Russia
3University of Turku, Finland
4Ioffe Physical-Technical Institute, St. Petersburg, Russia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.2 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe2021081643398
Language: English
Published: Sissa, 2021
Publish Date: 2021-08-16
Description:

Abstract

Here we report a new reconstruction of the event-integrated spectra of solar energetic particles(SEP) detected by neutron monitor (NM) network and space-borne detectors (mainly GOESdata) during ground-level enhancement (GLE) events. The reconstruction of SEP fluences isbased on the “bow-tie” method employing the latest advances in the NM data analysis (a time-dependent GCR background and the use of the NM yield function directly verified with theAMS-02 experiment data), usage of different space-borne detectors data and a detailed study ofdifferent uncertainties. As a result of this work, we obtained integral fluences of SEPs in theenergy range from 30 MeV to a few GeV for 58 moderate and strong GLE events since 1956.The results were fitted with the modified Band-function (a double power-law function with twoexponential cutoffs). An easy-to-use presentation of SEP fluences in the form of an analyticalexpression forms a solid basis for new studies in different fields, such as the influence of SEPs onthe atmosphere and a statistical study of extreme solar activity.

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Series: POS. Proceedings of science
ISSN: 1824-8039
ISSN-E: 1824-8039
ISSN-L: 1824-8039
Volume: 395
Article number: 1273
DOI: 10.22323/1.395.1273
OADOI: https://oadoi.org/10.22323/1.395.1273
Host publication: Proceedings of 37th International Cosmic Ray Conference (ICRC2021)
Conference: International Cosmic Ray Conference
Type of Publication: B3 Article in conference proceedings
Field of Science: 115 Astronomy and space science
Subjects:
Funding: This work was partially supported by the Academy of Finland (projects No. 321882 ESPERA, 330063 QUASARE). S.K. acknowledges support by the Russian Science Foundation project no. 20-72-10170. The work in the University of Turku was performed in the framework of the Finnish Centre of Excellence in Research of Sustainable Space funded by the Academy of Finland (grant no. 312357).
Academy of Finland Grant Number: 321882
330063
Detailed Information: 321882 (Academy of Finland Funding decision)
330063 (Academy of Finland Funding decision)
Dataset Reference: Detrended data of GLE recorded by NMs were obtained from the International GLE database https://gle.oulu.fi.
  https://gle.oulu.fi
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/