Three‐dimensional finite difference time domain modeling of the Earth‐ionosphere cavity resonances

Yang, Heng

doi:10.1029/2004gl021343

Cited by 74 publications

(85 citation statements)

References 27 publications

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“…[20] Comparing our FDTD results and data reported by Price and Melnikov [2004], some different features are observed in these two frequency variation patterns (see an example is presented in our previous work [Yang and Pasko, 2005;Yang et al, 2006]. Sentman [1989] found the maximum magnitude of the first mode splitting to be in the range 1.4-1.8 Hz in realistic measurements.…”

Section: Rs2s14supporting

confidence: 50%

“…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. It has been demonstrated that the conductivity perturbation at high altitudes (>70 km) leads to increase in the first SR frequency; whereas, the first SR frequency decreases with the conductivity perturbation at low altitudes (<70 km).…”

Section: Introductionmentioning

confidence: 88%

“…[6] We employ a three-dimensional FDTD model, which has been successfully applied to the studies of the SR frequency shifts during solar proton events and X-ray bursts in our previous work [Yang and Pasko, 2005]. In the present studies, the FDTD grid sizes in r, and directions near the equator are approximately 5, 1000 and 1000 km, respectively.…”

Section: Three-dimensional Fdtd Modeling Of Earth-ionosphere Cavitymentioning

confidence: 99%

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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: Rs2s14supporting

confidence: 50%

Section: Introductionmentioning

confidence: 88%

Section: Three-dimensional Fdtd Modeling Of Earth-ionosphere Cavitymentioning

confidence: 99%

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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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“…A simplified version of this model was previously applied to the Earth-ionosphere cavity by Yang and Pasko [2005]. The number of FDTD cells in q and f directions are 20 and 40, respectively.…”

Section: -D Fdtd Modeling For a Planetary Resonant Cavitymentioning

confidence: 99%

“…Nickolaenko et al [1999Nickolaenko et al [ , 2004 and Nickolaenko and Rabinowicz [2001] gave an analytical solution for the ELF pulses from the lighting strokes in the time domain. In our previous work [Yang and Pasko, 2005], a threedimensional (3-D) FDTD model is developed to describe the ELF propagation in the Earth-ionosphere cavity and the variation of SR parameters during solar proton events and X-ray bursts. In this paper, we use this FDTD model to extend our study to other celestial bodies, e.g., Titan, Venus, and Mars.…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional finite difference time domain modeling of the Schumann resonance parameters on Titan, Venus, and Mars

2006

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[1] The conducting ionosphere and conducting surface of Titan, Venus, and Mars form a concentric resonator, which would support the possibility of the existence of global electromagnetic resonances. On Earth, such resonances are commonly referred to as Schumann resonances and are excited by lightning discharges. The detection of such resonances on other planets would give a support for the existence of the electrical discharges in the lower atmosphere on these planets. In this paper, a three-dimensional finite difference time domain modeling for the extremely low frequency propagation is employed to study the Schumann resonance problems on Titan, Venus, and Mars. The atmospheric conductivity profiles for these studies are derived from the previously reported ionospheric models for these planets. The Schumann resonance frequencies and Q factors on these planets are calculated and are critically compared with those obtained from the previously published models.

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Anomalous phenomena in Schumann resonance band observed in China before the 2011 magnitude 9.0 Tohoku‐Oki earthquake in Japan

Zhou

Xiaolin

et al. 2013

JGR Atmospheres

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[1] The anomalous phenomena in the Schumann resonance (SR) band, possibly associated with the Tohoku-Oki earthquake (EQ), are studied based on the ELF observations at two stations in China. The anomaly appeared on 8 March, 3 days prior to the main shock, and was characterized by an increase in the intensity at frequencies from the first mode to the fourth mode in both magnetic field components, different from the observations in Japan before large EQs in Taiwan. The abnormal behaviors of the north-south and east-west magnetic field components primarily appeared at 0000-0900 UT and 0200-0900 UT on 8 March, respectively. The finite difference time domain numerical method is applied to model the impact of seismic process on the ELF radio propagation. A partially uniform knee model of the vertical conductivity profile suggested by V. C. Mushtak is used to model the day-night asymmetric Earth-ionosphere cavity, and a locally EQ-induced disturbance model of the atmospheric conductivity is introduced. The atmospheric conductivity is assumed to increase around the epicenter according to the localized enhancement of total electron content in the ionosphere. It is concluded that the SR anomalous phenomena before the Tohoku-Oki EQ have much to do with the excited sources located at South America and Asia and also with the localized distribution of the disturbed conductivity. This work is a further confirmation of the relationship of SR anomalies with large EQs and has further concluded that the distortions in the SR band before large EQs may be caused by the irregularities located over the shock epicenter in the Earth-ionosphere cavity by numerical method.

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Three‐dimensional finite difference time domain modeling of the Earth‐ionosphere cavity resonances

Cited by 74 publications

References 27 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

Three‐dimensional finite difference time domain modeling of the Schumann resonance parameters on Titan, Venus, and Mars

Anomalous phenomena in Schumann resonance band observed in China before the 2011 magnitude 9.0 Tohoku‐Oki earthquake in Japan

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