VLF system for SID monitoring

This paper presents a proposal for a SID (sudden ionosphere disturbances) monitoring system based on the VLF method. The research focuses on the assembly of a solar flare monitoring system by monitoring a VLF Bafa Turkey transmitter with a working frequency of 26.7 kHz. The study also shows the effect of the VLF radio waves over the ionosphere. Results are presented of solar flares recorded on the territory of Sofia Bulgaria in September 2022, when multiple M-class and C-class flares were observed. The results are compared with data recorded by DIAS (Dublin Institute for Advanced Studies) as well as against data from SpaceWeatherLive and https://solarmonitor.org. There is a similarity in the results obtained from different systems, and from different geographical areas, which proves the functionality of the proposed system and the method used.