Refereed journal article or data article (A1)

High-Resolution Spectral and Anisotropy Characteristics of Solar Protons During the GLE N(circle)73 on 28 October 2021 Derived with Neutron-Monitor Data Analysis




List of Authors: Mishev Alexander L, Kocharov Leon G, Koldobskiy Sergey A, Larsen Nicholas, Riihonen Esa, Vainio Rami, Usoskin Ilya G

Publisher: SPRINGER

Publication year: 2022

Journal: Solar Physics

Journal name in source: SOLAR PHYSICS

Journal acronym: SOL PHYS

Volume number: 297

Issue number: 7

Number of pages: 23

ISSN: 0038-0938

DOI: http://dx.doi.org/10.1007/s11207-022-02026-0

URL: https://link.springer.com/article/10.1007/s11207-022-02026-0

Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/175917408


Abstract
The first ground-level enhancement of the current Solar Cycle 25 occurred on 28 October 2021. It was observed by several space-borne and ground-based instruments, specifically neutron monitors. A moderate count-rate increase over the background was observed by high-altitude polar stations on the South Pole and Dome C stations at the Antarctic plateau. Most of the neutron monitors registered only marginal count-rate increases. Using detrended records and employing a method verified by direct space-borne measurements, we derive the rigidity spectra and angular distributions of the incoming solar protons in the vicinity of Earth. For the analysis, we employed a newly computed and parameterized neutron-monitor yield function. The rigidity spectra and anisotropy of solar protons were obtained in their time evolution throughout the event. A comparison with the Solar and Heliospheric Observatory/Energetic and Relativistic Nuclei and Electron (SOHO/ENRE) experiment data is also performed. We briefly discuss the results derived from our analysis.

Downloadable publication

This is an electronic reprint of the original article.
This reprint may differ from the original in pagination and typographic detail. Please cite the original version.




Last updated on 2022-12-08 at 13:22