Changes of the ® rst Schumann resonance frequency during relativistic solar proton precipitation in the 6 November 1997 event
نویسندگان
چکیده
The variations of the ®rst mode of Schumann resonance are analyzed using data from Kola peninsula stations during the solar proton event of 6 November 1997. On this day the intensive ̄ux of energetic protons on GOES-8 and the 10% increase of the count rate of the neutron monitor in Apatity between 1220 and 2000 UT were preceded by a solar X-ray burst at 1155 UT. This burst was accompanied by a simultaneous increase of the Schumann frequency by 3.5%, and the relativistic proton ̄ux increase was accompanied by 1% frequency decrease. These eects are explained by changes of the height and dielectric permeability of the Earth-ionosphere cavity.
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