Peculiarities of the geomagnetic field, revealed by gradient magnetic measurements at stratospheric altitudes

Tsvetkov, Yu. P.; Brekhov, Oleg; Bondar, T. N.; Tsvetkova, N. M.

doi:10.1134/s0016793215010120

Cited by 1 publication

(4 citation statements)

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“…This task was realised and described in Tsvetkov et al (2007a) and Brekhov et al (2013). It was proved in Tsvetkov et al (2015) that the use of the gradiometer with the measurement base equal to 6 km heights of 30 km makes it possible to obtain with certainty vertical gradient of the anomalous geomagnetic field generated by deep sources, which are located down to the lower boundary of the lithosphere.…”

Section: Methodsmentioning

confidence: 99%

“…2. The experiment is described in detail in the author's publications (Tsvetkov et al 2015(Tsvetkov et al , 2016.…”

Section: Methodsmentioning

confidence: 99%

“…The package makes it possible to calculate the Fourier spectrum for profile surveys (in a moving window) and estimate the depths of upper edges of anomaly forming objects by the inclination angle of the asymptote of the amplitude spectrum logarithm for selected harmonics. It is shown in Tsvetkov et al (2015) that the anomalous magnetic field at the height 30 km is mainly formed from fields of sources within the 100 km band on the Earth's surface. Repeated flights, due to a scatter of their trajectories, make it possible to obtain a wider band of surveys, i.e.…”

Section: Spectral Analysismentioning

confidence: 99%

“…The data of such a survey contain highly intense local anomalies from near-surface sources. However, the cited maps do not represent in full measure the fields of deep sources, which are several orders smaller than local anomalies produced by nearsurface sources (Tsvetkov et al 2015). That is why the fields of deep sources become lost in the process of constructing the maps presented in VSEGEI (2004), GSJ and CCOP (1996).…”

Section: Introductionmentioning

confidence: 99%

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Sources of the lithosphere magnetic field based on magnetic data obtained at different heights

Tsvetkov

Novikov²,

Ivanov

et al. 2018

Earth Planets Space

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Our investigations are based on the property that the fields of sources, whose depths are numerically equal to survey heights, are most brightly presented in the data of magnetic survey. Therefore, the magnetic field created by the upper boundary of the magnetically active layer is well presented in the data of magnetic surveys (survey heights are up to the first kilometres), whereas the geomagnetic field of the centre mass is well presented in the data of gradient magnetic surveys at heights of 20-40 km. These data were used separately for the interpretation of the depths of the upper and lower boundaries of the lithospheric magnetically active layer by spectral methods. This fact is especially valuable for estimating the positions of deep sources. For the central part of the East European platform, we obtained by spectral methods, the following values: the depth of the upper boundary of the layer is 8.5 km and that of the lower boundary of the layer is 64.3 km. The discrete localisation of the source depths along the profile is performed by the methods of converting the initial information into transformed fields, continuation upward, and reduction to the pole with the determination of singular points. The Poisson integral, representing the solution of the outer Dirichlet problem for the plane, served as a theoretical base for such an interpretation. These approaches made it possible to determine more exactly the localisation of deep sources along the profile and showed that the published magnetic maps based on aeromagnetic data do not contain in full measure the fields of deep-seated magnetic sources.

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Section: Methodsmentioning

confidence: 99%

“…2. The experiment is described in detail in the author's publications (Tsvetkov et al 2015(Tsvetkov et al , 2016.…”

Section: Methodsmentioning

confidence: 99%

Section: Spectral Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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