Studies on the shift in the frequency of the first Schumann resonance mode during a solar proton event

• Published in: Journal of atmospheric and solar-terrestrial physics Vol. 72; no. 11; pp. 829 - 836
• Main Authors: De, S.S., De, B.K., Bandyopadhyay, B., Paul, Suman, Haldar, D.K., Barui, S.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.07.2010; Elsevier
• Subjects: Earth, ocean, space; Exact sciences and technology; External geophysics; Frequency variation; Ionospheric disturbance; Physics of the ionosphere; Physics of the magnetosphere; Schumann resonance; Solar proton event; Wave–particle interaction; Schumann resonance; Wave–particle interaction; Frequency variation; Ionospheric disturbance; Solar proton event; X ray burst; Ionospheric duct; two-layer models; Wave-particle interaction; Ionization; Resonance frequency; protons; Frequency spectrum; Particle wave interaction
• ISSN: 1364-6826; 1879-1824
• DOI: 10.1016/j.jastp.2010.04.004

The variation of the first Schumann resonance (SR) frequency spectra observed from the recorded data over Kolkata (22.56°N, 88.5°E) during a solar proton event (SPE) on July 14, 2000 has been presented. It shows increase in frequency during X-ray bursts and decrease during the period of occurrence of an SPE. The results from some other locations for the same event are also reported. The severe X-ray bursts recorded just before the proton event exhibit enhancement in frequency of the first mode due to enhancement of ionization in the D-region of the ionosphere. Some attempts are made to explain the observed variation during solar proton events in terms of the perturbations within the Earth–ionosphere waveguide on the basis of two-layer-model.