Fundamentals and Data Analysis of Neutron Monitor Systems

This article starts with the origin of cosmic rays, then details the production of secondary particles in the atmosphere, the operating principles of NM64-type neutron monitors, and the required environmental corrections. It introduces the Neutron Monitor Database (NMDB) network—established with European Commission FP7 support—together with its web interface, RESTful API, and Python-based analysis capabilities. The paper demonstrates how NM data can be integrated into real-time monitoring and early-warning systems for space-weather phenomena such as Forbush decreases, solar energetic particle events, and especially ground-level enhancements (GLEs). Highlighting the current absence of a neutron monitor station in Türkiye, it stresses that deploying one would fill a regional data gap, improve the spatial resolution of the global NM network, and enhance the accuracy of space-weather models. Overall, the study bridges theory and applied research, underscoring the critical role of standardized long-term NMDB data in cosmic-ray physics and radiation-safety studies.