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

• Main Authors: Roldugin, V. C., Maltsev, Ye. P., Vasiljev, A. N., Vashenyuk, E. V.
• Other Authors: Polar Geophysical Institute of Russian Academy of Sciences (PGI), Russian Academy of Sciences Moscow (RAS)
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 1999
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.STU]Sciences of the Universe [physics]/Earth Sciences; Apatity; Kola Peninsula; Schumann; kola peninsula
• Online Access: https://hal.science/hal-00316684; https://hal.science/hal-00316684/document; https://hal.science/hal-00316684/file/angeo-17-1293-1999.pdf

International audience 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.