Institute of the Ionosphere

Almaty, Kazakhstan

Institute of the Ionosphere

Almaty, Kazakhstan

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Belov A.V.,Russian Academy of Sciences | Kryakunova O.N.,Institute of the Ionosphere | Abunin A.A.,Russian Academy of Sciences | Abunina M.A.,Russian Academy of Sciences | And 4 more authors.
Bulletin of the Russian Academy of Sciences: Physics | Year: 2017

The daily fluence is selected as the main characteristic of the behavior of electrons with E > 2 MeV measured by GOES satellites in geostationary orbits, since this characteristic is closely associated with malfunctions of satellite electronic equipment. It is shown that increases in the flux of high-energy magnetospheric electrons are associated with considerable interplanetary and magnetospheric perturbations, but lag behind them by 1–3 days. A greatly increased solar wind speed is observed as early as 3 days before the electron flux starts to grow, with a maximum being reached by the onset of growth. It is shown that the electron fluence is weakly associated with the level of geomagnetic activity on the same day but correlates to the Ар index of geomagnetic activity observed 2–3 days earlier. The fluence of high-energy magnetospheric electrons is closely associated with the solar wind’s speed, especially with its value measured 2 days earlier. © 2017, Allerton Press, Inc.


Krasnov V.M.,Russian State Hydrometeorological University | Drobzheva Y.V.,Russian State Hydrometeorological University | Salikhov N.M.,Institute of the Ionosphere | Zhumabaev B.T.,Institute of the Ionosphere | Lazurkina V.B.,Russian Academy of Sciences
Acoustical Physics | Year: 2014

The power of the Chelyabinsk meteoroid blast is estimated from model calculations and the results of optic, seismic, and infrasonic observations. The power of the blast has been determined as 1-3 kt of TNT. © 2014 Pleiades Publishing, Ltd.


Chernogor L.F.,Institute of the Ionosphere | Chernogor L.F.,University of Kharkiv | Domnin I.F.,Institute of the Ionosphere | Panasenko S.V.,Institute of the Ionosphere | Uryadov V.P.,Radiophysical Research Institute
Radiophysics and Quantum Electronics | Year: 2012

We describe the observation results of ionospheric disturbances at altitudes of 100 to 140 km, which occurred at a distance of about 1000 km from the Sura facility. The observations have been made using the incoherent scatter radar located near Kharkov. The electron density increase by 10-70% had a temporal duration of 10-20 min and accompanied the high-power HF heating. The time of disturbance evolution was about 10 min. The observation effect can be explained by the intensification of the subsystem coupling in the ionosphere-magnetosphere-upper atmosphere- ionosphere system, which leads to a precipitation of energetic electrons from the magnetosphere. Parameters of the precipitating particles and precipitation-produced ionization are estimated. © 2012 Springer Science+Business Media, Inc.


Chernogor L.F.,University of Kharkiv | Frolov V.L.,Radiophysical Research Institute | Barabash V.V.,Institute of the Ionosphere
Radiophysics and Quantum Electronics | Year: 2014

We present the observed disturbances of the parameters of the ionosphere affected by high-power radio waves from the SURA heating facility. Ionosondes located in Nizhny Novgorod and Moscow (Russia), Kharkov (Ukraine), and Pruhonice (Czechia) were used for the observations. The diagnostic tools were from 560 to 2200 km away from SURA. Additional ionization layers with a cutoff frequency of 2.6-3.4 MHz were occasionally observed on the ionograms of the Nizhny Novgorod and Moscow stations. The effective altitude of these layers was 120-160 km and the true altitude was about 110-130 km. The occurrence of additional ionization layers below 100-130 km was controlled by an increase in the minimum observable frequency (MOF). For the Moscow station, the MOF increased by about 1 MHz in the daytime and almost did not change in the night time. MOF variations on the ionograms of the Kharkov and Pruhonice stations were less significant (0.3-0.4 MHz) in all time of the day. The observed effects are most probably due to the midlatitude precipitation of electrons from the inner radiation belt, which increased the electron number density in the ionosphere, absorption of the sounding radio waves, and the MOF. Estimated particle flux density was 10 8-109 m-2 ·s-1. The electron number density in the daytime increased by a factor of 2-3. © 2014 Springer Science+Business Media New York.


Belov A.V.,Russian Academy of Sciences | Eroshenko E.A.,Russian Academy of Sciences | Kryakunova O.N.,Institute of the Ionosphere | Kurt V.G.,Moscow State University | Yanke V.G.,Russian Academy of Sciences
Geomagnetism and Aeronomy | Year: 2010

The catalog of ground level enhancements of solar cosmic rays during cycles 21-23 of solar activity has been presented. The main properties, time distribution, and relation of these events to solar sources and proton enhancements observed on satellites have been studied. © Pleiades Publishing, Ltd., 2010.


Somsikov V.M.,Institute of the Ionosphere | Andreev A.B.,Institute of the Ionosphere | Zhumabaev B.T.,Institute of the Ionosphere | Sokolova O.I.,Institute of the Ionosphere
Geomagnetism and Aeronomy | Year: 2011

A statistical analysis of the variations of three components of the Earth's magnetic field obtained at Almaty during 2008 is performed. It is found that in the daytime and nighttime periods, a distinct difference in the spectra of variations with periods corresponding to acoustic-gravity waves is observed. An explanation of this difference is proposed. It is based on the mechanism of change in the acoustic-gravity wave spectrum caused by the interaction of atmospheric gas with solar radiation. © 2011 Pleiades Publishing, Ltd.


Somsikov V.M.,Institute of the Ionosphere
Geomagnetism and Aeronomy | Year: 2011

The theoretical and experimental results of studies of the solar terminator as a source of inhomogeneous atmospheric structures are analytically reviewed. A classification of the mechanisms by which waves and atmospheric irregularities are generated is presented and briefly described. Several urgent problems related to further studies of the solar terminator and effects created by it in the near-Earth space are considered. © 2011 Pleiades Publishing, Ltd.


Belov A.V.,Russian Academy of Sciences | Eroshenko E.A.,Russian Academy of Sciences | Kryakunova O.N.,Institute of the Ionosphere | Nikolayevskiy N.F.,Institute of the Ionosphere | And 3 more authors.
Bulletin of the Russian Academy of Sciences: Physics | Year: 2015

It is commonly accepted that two ground level enhancements of solar cosmic rays (GLEs) have so far been recorded in solar cycle 24: one on May 17, 2012, and one on January 6, 2014. The current solar activity cycle is considered to lag behind previous cycles in both quantity and magnitude of GLEs. Considerably more (around 30) solar proton events have been recorded from satellites. In this work, we analyze the patterns of cosmic ray intensity over the worldwide neutron monitor network during those events of 2012 in which considerable increases in the integral proton fluxes with energies of >100 MeV were observed, i.e., the events of January 27, March 7, and March 13, 2012. All of these events may be considered possible GLEs. More GLEs have apparently been observed during solar cycle 24 than is widely recognized. © 2015, Allerton Press, Inc.


Lyashenko M.V.,Institute of the Ionosphere | Chernogor L.F.,Institute of the Ionosphere | Chernogor L.F.,University of Kharkiv
Geomagnetism and Aeronomy | Year: 2013

The calculation results of parameters of thermal and dynamical processes in the near-Earth plasma during the partial solar eclipse of August 1, 2008, over Kharkov are presented. The calculations showed that during the eclipse there occurred a decrease in the neutral temperature by approximately 17-40 K within the height range 250-350 km, respectively. At heights of 210-580 km, the eclipse resulted in an increase in the density, total plasma flux, and the flux of particles by tens of percentage points due to ambipolar diffusion. The paper presents the results of a comparative analysis of the effects in the ionospheric plasma during the partial eclipses over Kharkov of August 11, 1999; May 31, 2003; October 3, 2005; March 29, 2006; and August 1, 2008. General regularities in eclipse effects are noted. © 2013 Pleiades Publishing, Ltd.


Burmaka V.P.,Institute of the Ionosphere | Chernogor L.F.,University of Kharkiv
Geomagnetism and Aeronomy | Year: 2012

Using the Kharkov incoherent scatter radar, observations of wave disturbances in electron concentration N in the ionosphere at heights of 120-600 km are conducted. The measurements were carried out in the periods of the spring and fall equinoxes and winter and summer solstices. The height-time dependences of the absolute ΔN and relative ΔN/N amplitudes of wave disturbances, as well as their spectral composition, were analyzed. It is shown that wave disturbances in the ionosphere with periods of 10-180 min were present at almost any time of the day and in all seasons. Their absolute and relative amplitudes varied from 6 × 10 9 to 6 × 10 10 m -3 and from 0.01 to 0.5, respectively. The maximum values of ΔN and ΔN/N were observed at a height of ~200 km. The passage of the solar terminator changed substantially the wave disturbance parameters. © 2012 Pleiades Publishing, Ltd.

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