PoS - Proceedings of Science
Volume 423 - 27th European Cosmic Ray Symposium (ECRS) - Solar and Heliospheric Cosmic Rays
The first GLE (# 73 – 28-Oct-2021) of solar cycle 25: a study using space-borne and NM data
A. Mishev*, L. Kocharov, S. Koldobskiy, N. Larsen, E. Riihonen, R. Vainio and I. Usoskin
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Pre-published on: February 15, 2023
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The first solar proton event of solar cycle 25 was detected on 28 October 2021 by several neutron monitors (NMs) in the polar region; the strongest signal was registered by the DOMC/DOMB monitors located at the Antarctic plateau at Concordia French-Italian research station, as well as the fleet of space-borne instruments. It is identified as the GLE (ground-level enhancement) $\#$ 73 in the International GLE database. Here, we report the observations and the study of this event on the basis of the global NM network and SOHO/ERNE records. We present the derived angular and spectral features of solar energetic protons, including their dynamical evolution throughout the event employing a state-of-the-art model based on analysis of the neutron monitor data. We discuss the origin of the prompt and delayed components of the GLE-inducing solar protons. Several applications of the derived results are discussed.
DOI: https://doi.org/10.22323/1.423.0030
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