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
- Marcos Anzorena
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
- Universidad de Guadalajara
- University of Tokyo
- Toray Science Foundation
- Japan Society for the Promotion of Science
- Institute for Cosmic Ray Research, University of Tokyo