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

[摘要] The variations of the first mode of Schumannresonance are analyzed using data from Kola peninsula stations during the solarproton event of 6 November 1997. On this day the intensive flux of energeticprotons on GOES-8 and the 10% increase of the count rate of the neutron monitorin Apatity between 1220 and 2000 UT were preceded by a solar X-ray burst at 1155UT. This burst was accompanied by a simultaneous increase of the Schumannfrequency by 3.5%, and the relativistic proton flux increase was accompanied by1% frequency decrease. These effects are explained by changes of the height anddielectric permeability of the Earth-ionosphere cavity.

Key words. Ionosphere (ionospheric disturbances; solarradiation and cosmic ray effects) · Radio science (ionospheric propagation)

[学科分类] 地球科学(综合)