Study of Forbush decreases during Solar Cycle 25 with the ALPAQUITA array

Solar cycle $25$ is reaching its period of maximum activity. Associated to this, gigantic coronal mass ejection sweep cosmic rays in the Interplanetary medium, producing a sudden decrease in the cosmic-ray intensity is observed at Earth (and in space). These so called Forbush decreases (FD) can be detected on the surface of Earth at various geomagnetic cut-off rigidities using Neutron Monitors and muon telescopes. The ALPAQUITA detector located in Bolivia has been in operation since April $2023$ and is capable of detecting high rigidity FDs, using coincidences of any $1$ and any $2$ scintillators. In this presentation we show the results obtained with ALPAQUITA in the time period between $2023$-$2025$, including the important event of May $2024$ and June $2025$, comparing our results with neutron monitors and muon detectors around world to study the rigidity dependence of these events. With this we show our technique provides a novel approach to study FDs at the highest rigidities.

Authors

Publication Details

Published
2025-09-25
DOI
https://doi.org/10.22323/1.501.1272
Citations
1
Primary Topic
Solar and Space Plasma Dynamics
Type
article
Field-Weighted Citation Impact
1.15

Funders

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article

Study of Forbush decreases during Solar Cycle 25 with the ALPAQUITA array

Marcos Anzorena
1 citations
Solar and Space Plasma Dynamics
1.15
article

Study of Forbush decreases during Solar Cycle 25 with the ALPAQUITA array

Marcos Anzorena
article en
1 citations

Abstract

Solar cycle $25$ is reaching its period of maximum activity. Associated to this, gigantic coronal mass ejection sweep cosmic rays in the Interplanetary medium, producing a sudden decrease in the cosmic-ray intensity is observed at Earth (and in space). These so called Forbush decreases (FD) can be detected on the surface of Earth at various geomagnetic cut-off rigidities using Neutron Monitors and muon telescopes. The ALPAQUITA detector located in Bolivia has been in operation since April $2023$ and is capable of detecting high rigidity FDs, using coincidences of any $1$ and any $2$ scintillators. In this presentation we show the results obtained with ALPAQUITA in the time period between $2023$-$2025$, including the important event of May $2024$ and June $2025$, comparing our results with neutron monitors and muon detectors around world to study the rigidity dependence of these events. With this we show our technique provides a novel approach to study FDs at the highest rigidities.

Universidad de Guadalajara, University of Tokyo, Toray Science Foundation, Japan Society for the Promotion of Science, Institute for Cosmic Ray Research, University of Tokyo
Openalex Percentile: Top 16%
Solar and Space Plasma Dynamics
1.15
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Study of Forbush decreases during Solar Cycle 25 with the ALPAQUITA array — Marcos Anzorena · (2025) | TGRS Research Map | TGRS