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

• Main Authors: V. C. Roldugin, Ye. P. Maltsev, A. N. Vasiljev, E. V. Vashenyuk
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: Apatity; Kola Peninsula; Schumann; kola peninsula
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.371.6916; http://hal.archives-ouvertes.fr/docs/00/31/66/84/PDF/angeo-17-1293-1999.pdf

Abstract. 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 e€ects 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 e€ects) á Radio science (ionospheric propagation) radius of the outer sphere. Expression (1) can be rewritten as follows (taking into consideration h a) r����������������� xn c p����������������� n…n ‡ 1† fn n…n ‡ 1 † ˆ 10:6 Hz; …2†