Abstract Geomagnetically induced currents (GICs) in a quasi-meridional power transmission line on the Kola Peninsula are analyzed during intervals of Pc5/Pi3 (frequency range from 1.5 to 5 mHz) pulsations recorded at IMAGE magnetometer network. We have GIC transformer terminal station Vykhodnoy ( $$68^{\circ }$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mn>68</mml:mn><mml:mo>∘</mml:mo></mml:msup></mml:math> N, $$33^{\circ...

Local variations of the magnetic field in ULF‐ELF frequency range associated with seismicity are studied data more than 3 a observations at Karimshimo complex observatory (latitude 52.83°N, longitude 158.13°E, Kamchatka, Russia). A wideband emission is found to start about 5 d before an earthquake and last until after it. Seismic ULF/ELF 4–6 Hz as compared seismically quiet background has enhanced P hh / dd spectral ratio reduced standard deviation ellipse orientation angle ellipticity, it...

The review offered for the first time in Russian scientific literature is devoted to various aspects of problem impact space weather on ground transport systems. An analysis available information indicates that disturbances can affect rail infrastructure through both direct and indirect effects system components. One main hazards geomagnetically induced currents (GICs) grounded extended structures excited by geomagnetic field disturbances. telluric electric fields associated with them cause...

Diurnal variations of the parameters magnetospheric Alfvén resonator at different latitudes have been calculated using a semi-empirical model ionosphere-magnetosphere plasma distribution. The ionospheric density is taken from IRI model, electron equator based on ISEE/whistler and field-aligned distribution under assumption diffusive equilibrium. It shown that for mid-latitude ionosphere Hall conductivity has no effect resonator. values damping rates oscillations middle during dark period are...

Abstract. A relation between parameters of preseismic ULF/ELF emissions and EQ is studied. The magnetic data measured at Karymshino station (Kamchatka, Russia) along with on local seismic activity during eight years observations (2001–2008) are taken for the analysis. Source azimuth detected in different techniques, based analysis total field its polarized pulsed component. latter technique shows a better accuracy source detection. errors method associated existence non-seismic sources use...

Abstract. We analyze Pc2-3 pulsations recorded by the CHAMP (CHAllenging Minisatellite Payload) satellite in F layer of Earth's ionosphere, on ground, and magnetosphere during quiet geomagnetic conditions. The spectra are enriched with frequencies above 50 mHz comparison to ground spectra. These higher than fundamental harmonics field line resonances magnetosphere. High quality signals dominant 70–200 a regular phenomenon mean latitude maximum occurrence rate lies at L &amp;amp;approx; 3.5...

Two‐dimensional (2‐D) statistical distributions of spectral power and coherence polar geomagnetic variations with quasi‐periods about 10 min are analyzed using data from magnetometer arrays in Antarctica. Examination the 2‐D patterns shows occurrence significant levels but low spatial near cusp projection auroral region. At same time, low‐amplitude pulsations, which we coin Pi cap 3 very coherent throughout cap. The region occupied by pulsations is shifted toward local MLT night pole...

Latitudinal and diurnal distributions of spectral power spatial coherency parameters the geomagnetic variations in Pc5‐6 (1–6 mHz) frequency range are analyzed using data magnetometer stations Antarctica. The available give possibility to form a latitude chain along meridian 40°E stretching from magnetic 69°S 86°S. Long‐period ULF activity at polar cap latitudes is characterized by lower amplitudes wider spectra with central frequencies as compared typical auroral Pc5 pulsations. meridional...

Abstract. We analyze spectral parameters of the geomagnetic disturbances within 1–4 mHz (Pc5/Pi3) frequency range for 29 observatories from polar to auroral latitudes. The main object this study is broadband (noise) background under quiet and moderately disturbed conditions. To obtain a quantitative description high-latitude long period ULF activity log-log dependence power on expanded over Legendre polynomials, coefficients expansion (spectral moments) are used describe most common features...

The authors study the possible influence of geomagnetic activity railway automatics in Russian Arctic. For analysis they use indices global and regional along with archive failures on Northern section Oktyabrskaya 2001—2006. is found to be higher for days than without ones. This effect manifests itself different types disturbances, including magnetic storms, characterized by storm index Dst, auroral activations, quantified AE EI indices, as well local WY indicating spectral power variations...

A common view is that spectral maxima in observed resonance structures (SRS) of ionospheric Alfvén resonator (IAR) at frequencies f &lt;5 Hz are the signature IAR. We have studied not only spectra but also waveforms magnetic fluctuations IAR registered Moshiri station (Japan) and found there exist two kinds signals. The dominant type signal a pair pulses which caused by an initial exciting impulse accompanied single reflection from top boundary In absence lower ionosphere, such signals...

ULF geomagnetic pulsations till recent time have been an underestimated factor of space weather hazard to technological systems.The efficiency GIC generation by depends on frequency and spatial distribution the pulsation's magnetic field.To clarify how spectral content Pc5-6/Pi3 (periods 3-15 min) influences their in generation, inter-relations between amplitudes field variations are studied statistically.For that, we use data four-year (2014-2018) continuous recording at Vykhodnoy auroral...

In this paper, we present a statistical and case analysis of nighttime Pc3 pulsations observed from middle to equatorial latitudes during the year 2003. We found two groups pulsations. Pc3s first group are in fact nightside counterpart morning with large azimuthal scales slowly attenuating toward midnight. Such night signatures waves periods fast solar wind ( $$V>500\,\hbox {km/s}$$ ). The second type is locally generated They can be under moderate velocities. Maximal occurrence rates...

Abstract. A study is undertaken into parameters of the polar auroral and geomagnetic pulsations in frequency range 1–4 mHz (Pc5∕Pi3) during quiet intervals preceding substorms non-substorm background variations. Special attention paid to that occur under interplanetary magnetic field (IMF) conditions typical for undisturbed days (non-triggered substorms). The spectral observed luminosity as measured by a meridian scanning photometer (Svalbard) cap near boundary oval are studied compared with...

The results of different algorithms for automatic detection wave packets in geomagnetic records are compared: the approach based on Fourier transform a running time window (F-method), and discrete perfect set (DPS) analysis.Using 1-sec data from mid-latitude INTERMAGNET station we determined with both such statistical properties Pc3 pulsations frequency range 30-80 mHz as diurnal variations, occurrence, amplitude probability distributions, etc.The distributions occurrence by methods have...

Abstract. The present case study is focused on fluctuations at ∼ 1.5 mHz observed open field lines in both of the polar caps ground-based geomagnetic data and electron concentration Northern Hemisphere ionosphere. Coherent pulsations with a relatively narrow narrowband-like spectra higher fraction transversal components total spectral power are also by Cluster satellites magnetotail magnetic field. Interestingly, started after over similar frequency range solar wind dynamic pressure...

Abstract. We examine the statistical relationships between interplanetary parameters and spectral power of geomagnetic fluctuations in 1–4 mHz frequency band at high latitude stations two hemispheres. For that, we use a cross-correlative analysis different combinations to identify factor contributing most ULF choose (whenever possible) cross-related keynote controlling parameters. Along with well-known dependencies pulsation on solar wind velocity variations SW dynamical pressure an...