Motivation

The TRASGO (TRAck reconStructinG bOx) project develops Resistive Plate Chamber telescopes for cosmic-ray studies. miniTRASGO is the compact member of this family: a cost-effective 0.1 m² muon tracker built from four 30 × 30 cm² multigap RPC modules and a DAQ system adapted from the HADES experiment. It monitors secondary cosmic rays to investigate solar activity, atmospheric effects, and other space-weather phenomena.

The first miniTRASGO began operation in Madrid in 2023 and has already recorded a Forbush Decrease candidate, demonstrating stable performance despite its small footprint. Additional units in Warsaw and Puebla, with another planned for Monterrey, will form a network spanning different geomagnetic cut-off rigidities. miniTRASGO's goal is to provide accessible, scalable muon monitoring—complementing existing observatories rather than competing with them.