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

• Published in: Annales Geophysicae
• Main Authors: Roldugin, V. C., Maltsev, Ye. P., Vasiljev, A. N., Vashenyuk, E. V.
• Format: Text
• Language: English
• Published: 2018
• Subjects: Apatity; Kola Peninsula; Schumann; kola peninsula
• Online Access: https://doi.org/10.1007/s00585-999-1293-9; https://angeo.copernicus.org/articles/17/1293/1999/

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)