Analysis detects cosmic ray decreases in 2023-2025 using ALPAQUITA, suggesting new techniques in studying solar effects.
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.
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Marcos Anzorena (2025) studied this question.
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