Journal Article

PUBDB-2024-07388

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Increase in the count rates of ground-based cosmic-ray detectors caused by the heliomagnetic disturbance on 5 November 2023

Chilingarian, A. (Corresponding author) ; Karapetyan, T. ; Sargsyan, B. ; Zazyan, M. ; Knapp, J.DESY* ; Walter, M. ; Rehm, T.

2024
EDP Sciences Les Ulis

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Please use a persistent id in citations: doi:10.1209/0295-5075/ad329c

Abstract: This letter presents a rare physical phenomenon associated with solar activity, manifesting in anomalies within neutron, electron, and gamma-ray fluxes in the atmosphere. Conventionally, the Earth’s magnetic-field disturbances reduce cosmic-ray intensity reaching the surface.However, a temporary surge in cosmic-ray flux occurs intermittently known as the magnetosphericeffect (ME). Our observations reveal that this effect predominantly induces a count rate increasein particle detectors positioned at middle latitudes on mountaintops. On November 5, 2023, a2–3% increase in neutron monitors at mountain altitudes and up to 5% increase in thin plasticscintillators registering electrons and gamma rays was observed. This flux escalation coincidedwith a southward orientation of the interplanetary magnetic field. Importantly, we present, forthe first time, the energy spectrum of the Magnetospheric Effect observed at two mountaintops:Aragats and Zugspitze. Simulations of low-energy proton interactions in the terrestrial atmosphere affirm the augmentation of low-energy cosmic rays. Protons, typically restricted by thegeomagnetic cutoff, reached the Earth’s atmosphere, generating detectable particle showers onthe Earth’s surface. To sum up, 1) we measure an increase in the count rate of magnetosphericorigin using particle detectors located at mountain altitudes and middle latitudes; 2) for the firsttime, we measured the energy spectra of the particle fluxes during the magnetospheric effect withspectrometers located on Mount Aragats and Zugspitze; 3) particle flux enhancement coincideswith the depletion of the horizontal component of the geomagnetic field; 4) we explain why themagnetospheric effect was observed at mountain altitudes and not at sea level.

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Contributing Institute(s):

1. Gammaastronomie (Z_GA)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF4-613) (POF4-613)

Experiment(s):

1. Cherenkov Telescope Array

Appears in the scientific report 2024

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; IF < 5 ; JCR ; National-Konsortium ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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