Diurnal variations of Schumann resonance frequency in NS and EW magnetic components

Roldugin, V. K.

doi:10.1029/2004ja010487

Cited by 16 publications

(19 citation statements)

References 14 publications

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“…[21] Roldugin et al [2004b] concluded that diurnal SR frequency variation is mainly controlled by local time, and the different field components undergo different variation patterns because of the horizontal inhomogeneity of the ionosphere. Nickolaenko et al [1998] found that the source area of the global lightning activity also plays an important role affecting the SR frequency variation.…”

Section: Rs2s14mentioning

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: Rs2s14mentioning

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 changes in SR frequencies are sensitive to a general increase/decrease of conductivity within the outer layer (Sátori et al, 2005). It has been found, experimentally, that the variations in the N-S and E-W magnetic components occur in antiphase for the first Schumann resonance frequency (Roldugin et al, 2004a). Sátori (1996) studied that the average daily frequency patterns are different for the three modes.…”

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

confidence: 99%

“…Roldugin et al (1999) showed that the SR frequency depends both on the electron density in the ionospheric Dregion and on the base height of this region. For the interpretation of our data, we now consider, in some detail, the simple model of Roldugin et al (2003), for which the authors establish a quantitative relation between SR frequencies and the ionospheric parameters. Considered is a two-layer model, where the discontinuous relative electrical permittivity assumes the values [taking z from the Earth's surface positive upwards and assuming a time factor exp (iωt)]…”

Section: Estimation Of Electron Density In Lower Ionospherementioning

confidence: 99%

“…The study of the Schumann resonance frequency variation has become an important tool for ionospheric characterization in terms of electron density variations and monitoring a sudden disturbance in the ionosphere during solar proton events (Roldugin et al, 2001(Roldugin et al, , 2003. The precise measurements of the resonance frequencies, with high spectral resolution, were carried from the audiomagnetotelluric and magnetotelluric data (Beamish and Tzanis, 1986;Melnikov et al, 2004;Tulunay et al, 2008) to monitor sudden ionospheric disturbances.…”

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

confidence: 99%

“…It has been well established that the resonance frequencies contain information about space time distribution of lightning strokes around the globe. Diurnal variation in SR frequencies depends on the point of observation, which may also vary in different field components (Bliokh et al, 1980;Nickolaenko, 1997;Roldugin et al, 2004a).…”

Section: Introductionmentioning

confidence: 99%

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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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Background Features of Schumann Resonances Observed in Yunnan, Southwestern China

Ouyang

Zhang

Shen

et al. 2013

Chinese J of Geophysics

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This paper presents the background features of Schumann resonances (SR) observed at the Yongsheng observatory in Yunnan, southwestern China. We calculated the hourly average of the frequency and power spectral density (PSD) of the lowest three SR modes, and analyzed diurnal variation of SR frequency and PSD both in BNS and BEW components around equinoxes and solstices. Diurnal variation of SR PSD is found to be related to the dominant intervals of Asian, African and American thunderstorm centers and the relative position of the observatory to three thunderstorm centers. Diurnal variation of SR frequency is more complicated. SR frequency and PSD at the lowest three modes around the summer solstice and autumn equinox are more variable than that in the spring equinox and winter solstice. The daily median of SR peak frequency in 2011 shows that seasonal variation of peak frequency is blurry, while annual variation of daily median of PSD shows a clear seasonal variation which resembled half a period of a sine curve and symmetrically distributed about July. The seasonal variation of PSD is in accordance with that of lightning activities. Frequency of the first mode is about at 7.5 Hz both in BNS and BEW components. However, with the higher mode, SR frequency in BNS component is 0.5 Hz larger than that in BEW component. The cause of this frequency shift is not clear yet.

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Diurnal variations of Schumann resonance frequency in NS and EW magnetic components

Cited by 16 publications

References 14 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

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

Background Features of Schumann Resonances Observed in Yunnan, Southwestern China

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