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The variations of the first mode of Schumann\udresonance are analyzed using data from Kola peninsula stations during the solar\udproton event of 6 November 1997. On this day the intensive flux of energetic\udprotons on GOES-8 and the 10% increase of the count rate of the neutron monitor\udin Apatity between 1220 and 2000 UT were preceded by a solar X-ray burst at 1155\udUT. This burst was accompanied by a simultaneous increase of the Schumann\udfrequency by 3.5%, and the relativistic proton flux increase was accompanied by\ud1% frequency decrease. These effects are explained by changes of the height and\uddielectric permeability of the Earth-ionosphere cavity.  <b>Key words.</b> Ionosphere (ionospheric disturbances; solar\udradiation and cosmic ray effects) · Radio science (ionospheric propagation

Changes of the first Schumann resonance frequency during relativistic solar proton precipitation in the 6 November 1997 event