The study was conducted of the dynamics of large-scale structures of the polar region F2, due to the change of the sign of the By-component of the interplanetary magnetic field. It is shown that one of the reasons for non-stationary variations of the ionosphere structure in polar caps can be fast variations of the By-components of MMP. The time of transfer of the ionization language from morning to evening is 3000 s. This process is accompanied by the stratification of the ionization language and the formation of large-scale ionization spots that disintegrate over time.
Keywords: polar ionosphere, convection, the electron concentration, interplanetary magnetic field, the helio-geophysical conditions, ionospheric disturbances, polar cap, By - component of MMP, the F-layer
In the various methods of non-destructive testing, which working with the deformation fields, diagnostic accuracy is largely dependent on the intensity of structural noise caused by small-scale irregularities of building structures. In this paper we investigate the effectiveness of using a vector-scalar receiving systems for diagnostics of vibration and defectoscopy of building structures. Comparative analysis of the fluctuations of the scalar and energy flux components of the structural noise acoustic field was conducted using computer simulation. Suppression of this noise contributes to a more precise localization of defects in constructions. The study was conducted in view of the fact that the component of the stream of the acoustic field, for which the intensity of the structural noise is minimal, is measured indirectly, using two sensors: scalar and vector. It is shown that the use of energy flux component can increase the detection efficiency.
Keywords: flaw detection, structural noise, fluctuation, components of the acoustic field, energy flux
The algorithm, which allows to apply the Prony method to estimate of the sources parameters using vector-scalar receiving array is discussed. Noise immunity of the proposed algorithm is very high, so as the measured components of the acoustic field does not contain a noise.
Keywords: Prony algorithm, vector-scalar array, dynamic sea noise, the covariance, the flow of power