The investigation of the effect of space weather on different layers of the terrestrial atmosphere has been and remains a relevant problem of remote sensing of the environment. We describe a technique for detecting modifications of the peak frequencies of the Schumann resonance during the sudden ionospheric disturbances (SID) caused by the solar X-ray flares. The SID is associated wit... https://johnsmustangs.shop/product-category/1964-1973-engine-valve-cover/