Schumann resonance frequency increase during solar X‐ray bursts

Roldugin, V. K.; Maltsev, Y. P.; Vasiljev, A. N.; Schokotov, A. Y.; Belyajev, G. G.

doi:10.1029/2003ja010019

Cited by 38 publications

(36 citation statements)

References 13 publications

(20 reference statements)

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“…During the solar proton events (SPE), high-energy particle precipitation is often accompanied by X-ray bursts leading to significant perturbations of the conductivity in the cavity. Different shifts of the SR parameters were reported in the realistic measurements [e.g., Schlegel and Füllekrug, 1999;Roldugin et al, 2001Roldugin et al, , 2003Roldugin et al, , 2004aSátori et al, 2005]. In our previous work [Yang and Pasko, 2005], the variation patterns of the first SR frequency associated with the ionospheric conductivity perturbation during SPEs and X-ray bursts were discussed.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional finite difference time domain modeling of the diurnal and seasonal variations in Schumann resonance parameters

Yang

Pasko

2006

Radio Science

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[1] The diurnal and seasonal variations of Schumann resonances (SR) have been reported in a number of experiments. In this paper, a three-dimensional FDTD model of the Earth-ionosphere cavity with a day-night asymmetric conductivity profile is employed to study the diurnal and seasonal variability of the power and frequency of the first Schumann resonance (SR) mode. Comparison of the FDTD results and recent experimental measurements shows a clear modulation in the SR power related to the local ionospheric height and global lightning activity. It is found that SR frequencies are not only a function of the local time but also are controlled by the global lightning activity changing with universal time.

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Section: Introductionmentioning

confidence: 99%

Three‐dimensional finite difference time domain modeling of the diurnal and seasonal variations in Schumann resonance parameters

Yang

Pasko

2006

Radio Science

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“…The solar proton event is modeled as azimuthally symmetric conductivity perturbations at an altitude of 40 km and centered at the North and South Poles; the X-ray burst is modeled as an azimuthally symmetric conductivity perturbation at an altitude of 70 km and centered only at the North Pole. A discussion follows comparing the FDTD-calculated results with previous reports in the literature [56], [60]- [63].…”

Section: Schumann Resonancesmentioning

confidence: 99%

A Review of Progress in FDTD Maxwell's Equations Modeling of Impulsive Subionospheric Propagation Below 300 kHz

Simpson

Taflove

2007

IEEE Trans. Antennas Propagat.

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Abstract-Wave propagation at the bottom of the electromagnetic spectrum (below 300 kHz) in the Earth-ionosphere waveguide system has been an interesting and important area of investigation for the last four decades. Such wave propagation is characterized by complex phenomena involving nonhomogeneous and anisotropic media, and can result in resonances of the entire Earth-ionosphere cavity. In the spirit of this Special Issue, the goal of this paper is to call attention to emerging finite-difference time-domain computational solutions of Maxwell's equations for wave propagation below 300 kHz which promise to complement and extend pre-

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“…Schumann resonance frequencies determined separately for N-S and E-W magnetic component differ by 0.5-1.8 Hz (Sentman, 1987(Sentman, , 1989. The variation in first and second mode Schumann resonance frequency occurred during the intense solar X-ray burst by ∼0.2 Hz and 0.3 Hz, respectively (Roldugin et al, 2004b). Hayakawa et al (2008) showed the short term spectral modification associated with the Moshiri (Japan) earthquake, in the Schumann resonance frequency band of 2.5-40 Hz.…”

Section: R Chand Et Al: Schumann Resonance Frequency Variations Obsmentioning

confidence: 99%

Schumann resonance frequency variations observed in magnetotelluric data recorded from Garhwal Himalayan region India

2009

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Abstract. Schumann resonance (SR) frequency variation has been studied using Magnetotelluric (MT) data recorded in one of the world's toughest and generally inaccessible Himalayan terrain for the first time in the author's knowledge. The magnetotelluric data, in the form of orthogonal time varying electric and magnetic field components (E x , E y , B x and B y ), recorded during 10 March-23 May 2006, in the Himalayan region, India, at elevations between 1228-2747 m above mean sea level (amsl), were used to study the SR frequency variation. Electromagnetic field components, in the form of time series, were recorded at 64 Hz sampling frequency at a site located away from the cultural noise. Spectral analysis of time series data, at a frequency resolution of 0.03 Hz, has been performed using Fast Fourier Transform (FFT) algorithm. Spectral stabilization in three Schumann resonance modes is achieved by averaging the power spectral magnitude of 32 data segments, each with 2048 sample data. Amplitude variation in the Schumann resonance frequency associated with day-night, sunrise and terminator effect was observed. Average diurnal variation in the first three Schumann resonance frequencies associated with magnetic field components is presented. The maximum frequency variation of about 0.3, 0.4 and 0.7 Hz was observed in the first, second and third mode, respectively. The frequency variations observed in electric and magnetic field components also show phase shift and varying attenuation. The SR frequency variation has been used to define the ionospheric electron density variation in the Himalayan region, India.Keywords. Ionosphere (Electric fields and currents) -Meteorology and atmospheric dynamics (Lightning) -Radio science (Electromagnetic noise and interference)Correspondence to: R. Chand

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Schumann resonance frequency increase during solar X‐ray bursts

Cited by 38 publications

References 13 publications

Three‐dimensional finite difference time domain modeling of the diurnal and seasonal variations in Schumann resonance parameters

Three‐dimensional finite difference time domain modeling of the diurnal and seasonal variations in Schumann resonance parameters

A Review of Progress in FDTD Maxwell's Equations Modeling of Impulsive Subionospheric Propagation Below 300 kHz

Schumann resonance frequency variations observed in magnetotelluric data recorded from Garhwal Himalayan region India

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