Articles | Volume 17, issue 10
31 Oct 1999
31 Oct 1999

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

V. C. Roldugin, Ye. P. Maltsev, A. N. Vasiljev, and E. V. Vashenyuk

Abstract. The variations of the first 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 flux 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 flux increase was accompanied by 1% frequency decrease. These effects are explained by changes of the height and dielectric permeability of the Earth-ionosphere cavity.

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