A technique for reconstruction of global lightning distance profile from background Schumann resonance signal

Швец, А. В.

doi:10.1016/s1364-6826(01)00024-4

Cited by 33 publications

(47 citation statements)

References 23 publications

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“…Poisson's law describes the distribution of number of pulses in a succession with statistical properties defined above [see, e.g., Middleton, 1960]. On the above assumptions, the power spectral densities of the field components formed by Poisson successions of electromagnetic pulses from lightning return strokes distributed around the Earth's surface, are expressed as expansions in a series of distance-dependent basis functions [Shvets, 2001]:…”

Section: Inversion Of Sr Spectra Into Distance Profiles Of Source Intmentioning

confidence: 99%

“…ð Þ j j 2 and effective occurrence rates x (events per second) within segments on the Earth's surface corresponding to the full set of distance intervals. The expansion coefficients M ew and M ns representing partial "ew" and "ns" distance profiles of source intensity depend on the azimuthal distribution of sources with reference to an observatory owing to directional selectivity of magnetic sensors, while their sum equals to the full distance profile: M ew + M ns = M [Shvets, 2001].…”

Section: Inversion Of Sr Spectra Into Distance Profiles Of Source Intmentioning

confidence: 99%

“…[20] Different kinds of noises in experimental measurements, errors in determination of the ELF propagation parameters, unknown frequency dependence of a source spectrum, and a problem of choice of the regularization parameter a in the inverse problem solution were investigated by Shvets [2001], Ando et al [2005a], and Ando and Hayakawa [2007]. It was shown by these studies, in particular, that serious errors in the reconstructed distance profiles are connected with "slow" trends in the experimental field spectra introduced by the source spectrum Idl (w), if it is not flat in the SR frequency range, or/and by uncorrected frequency response of the receiving channels.…”

Section: Inversion Of Sr Spectra Into Distance Profiles Of Source Intmentioning

confidence: 99%

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Variations of the global lightning distribution revealed from three‐station Schumann resonance measurements

2010

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[1] Schumann resonance (SR) observations performed simultaneously by a global network consisting of three stations (Lekhta (Karelia, Russia), Moshiri (Hokkaido, Japan), and West Greenwich (Rhode Island, United States)) during almost 1 year were used for mapping world thunderstorm activity. A two-stage inverse problem is solved for locating lightning sources distributed over the Earth's surface from the SR background signals. The first stage consists of inversions of the SR magnetic field power spectra to the distributions of lightning intensity by distance relative to an observation point. The obtained distance profiles of intensity of sources are used as tomographic projections for reconstructing a spatial distribution of sources in the second stage. We have suggested the use of source distance profiles obtained from the spectra of outputs of two orthogonal magnetic antennas operating at each observatory as separate tomographic projections. It is shown that the implementation of additional information on the azimuthal distribution of sources, provided by angular selectivity of magnetic sensors, significantly improves the quality of global lightning mapping under the condition of a limited number of observation stations. Maps of the global lightning distributions constructed by the result of inversions of SR spectra show that the most active regions vary zonally on the seasonal time scale and meridionally on the diurnal time scale being connected mainly with continental areas in the tropics.

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Section: Inversion Of Sr Spectra Into Distance Profiles Of Source Intmentioning

confidence: 99%

Section: Inversion Of Sr Spectra Into Distance Profiles Of Source Intmentioning

confidence: 99%

Section: Inversion Of Sr Spectra Into Distance Profiles Of Source Intmentioning

confidence: 99%

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Variations of the global lightning distribution revealed from three‐station Schumann resonance measurements

2010

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“…Therefore SR signals carry information on both sources and electromagnetic properties of the cavity determined by the lower ionospheric properties. Some inverse problem solutions have been developed for revealing the global lightning distribution and the planetary conductivity variation based on the analysis of the average background SR signals [e.g., Heckman et al, 1998;Cummer, 2000;Shvets, 2001]. Because of the possible connections between the Earth's climate and global lightning activity, SR observations can be also applied to monitor the global environmental changes.…”

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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“…This inverse problem was formulated and examined by Shvets [2001]. We use the method similar to his, except for the set of basis functions with an improvement.…”

Section: Inverse Problemmentioning

confidence: 99%

Finite difference analyses of Schumann resonance and reconstruction of lightning distribution

Ando

Hayakawa

Швец³

et al. 2005

Radio Science

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[1] This paper deals with the computation of extremely low frequency propagation associated with the Schumann resonance phenomena and the reconstruction algorithm for source lightning location on the basis of measured Schumann resonance data. The finite difference equations are derived in terms of discretized magnetic fields in the spherical coordinates, introducing the azimuthal symmetry for simplicity. The most reliable electron and neutral density models in the atmosphere and the ionosphere can be used to describe extremely low frequency wave propagation. A linear inverse problem for the reconstruction is formulated using the computed spectra as a set of basis functions to identify lightning distributions with respect to the distances from any observatories to the global thunderstorm centers. Numerical experiments allow us to evaluate properties and precision of the solution in the absence or in the presence of noise in the initial spectral data. The inverse problem is applied to the experimental data collected at a field site in Japan, and distribution of global lightning activity is reconstructed for the data covering the period from March to December 1999. The reconstructed data show a reasonable set of distances from the observatory to well-known global thunderstorm centers, and they indicate the seasonal drift of lightning activity. The problems that were involved in solving the inverse problem are also discussed.

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A technique for reconstruction of global lightning distance profile from background Schumann resonance signal

Cited by 33 publications

References 23 publications

Variations of the global lightning distribution revealed from three‐station Schumann resonance measurements

Variations of the global lightning distribution revealed from three‐station Schumann resonance measurements

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

Finite difference analyses of Schumann resonance and reconstruction of lightning distribution

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