Formation of a Ring-Shaped Region of Increased Electron Temperature in the Subauroral Ionosphere in Winter

Geomagnetism and Aeronomy - The results of numerical simulations of the electron temperature (Te) are compared with measurement data provided by the CHAMP satellite to show the possibility of the...     

Large-Scale Disturbances Features Induced in the Ionosphere by Powerful Decameter Radiation during Moderate Magnetic Storms

Geomagnetism and Aeronomy - The paper presents the results of experimental studies of aperiodic and quasi-periodic disturbances in the ionosphere that were observed under the influence of powerful...     

Effect of Magnetic Storms on Low-Frequency Seismic Noise

Izvestiya, Physics of the Solid Earth - Abstract—The response of seismic noise in the minute range of periods to the strong magnetic storms is studied. The noise is analyzed from the records...     

Differences in the Dynamics of the Asymmetrical Part of the Magnetic Disturbance during the Periods of Magnetic Storms Induced by Different Interplanetary Sources

Geomagnetism and Aeronomy - The differences in the dynamics of the asymmetrical part of the geomagnetic disturbance at middle and low latitudes during magnetic storms initiated by different...     

The Effect of Strong Magnetic Storms on the Occurrence of Large Earthquakes

Izvestiya, Physics of the Solid Earth - Abstract—The times of occurrence of the earthquakes with magnitudes M ≥ 6.5 all over the world are compared with the commencement times of the...     

Discussion of the Problem of Ionospheric Precursors of Magnetic Storms

Geomagnetism and Aeronomy - The problem of disturbances of the parameters of the F2 layer and the upper ionosphere during the days preceding the beginning of a magnetic storm has already been known...     

Effect of Weak Magnetic Storms on the Propagation of HF Radio Waves

Geomagnetism and Aeronomy - Vertical and oblique sounding data for northeastern Russia have been used to analyze the conditions for the propagation of radio waves during weak geomagnetic storms...     

Influence of the Solar Wind and Geomagnetic Activity Parameters on Variations in the Cosmic Ray Cutoff Rigidity during Strong Magnetic Storms

Geomagnetism and Aeronomy - The correlation between the variations of geomagnetic cutoff rigidity ΔR and interplanetary parameters and the Dst index of geomagnetic activity during one moderate...     

Influence of the Ionosphere on the Parameters of the GPS Navigation Signals during a Geomagnetic Substorm

Geomagnetism and Aeronomy - The influence of geomagnetic activity on slips of navigation signals of the global positioning system (GPS), as well as an increase in the amplitude of jumps in the...     

Role of the Outer Ionosphere in the Winter/Summer Asymmetry of Auroral Electron Precipitations

Geomagnetism and Aeronomy - This paper analyzes the role of the outer ionosphere in the occurrence of a large difference in the frequency of accelerated electron fluxes in the auroral region in the...     

Rapid Variations in Electron Density Profiles in the Ionosphere Detected with the IZMIRAN High-Speed Ionosonde

Geomagnetism and Aeronomy - The article presents a new technique for the measurement of rapid variations in electron density in the ionosphere based on the rapid obtainment of vertical sounding...     

Dynamics of Interplanetary Parameters and Geomagnetic Indices during Magnetic Storms Induced by Different Types of Solar Wind

Geomagnetism and Aeronomy - Based on the OMNI2 archival data for 1995–2017, the dynamics of geomagnetic activity indices (Dst, ap, AE, and PC) and interplanetary parameters over the periods...     

The Thin Magnetic Structure of Facular Areas and the Influence of Scale Transformations on the Temperature Profiles of Faculae

Geomagnetism and Aeronomy - A distinctive feature of chromospheric magnetic fields in the facular regions on the Sun is their very fine spatial structure. In accordance with the observations...     

Identification of Vortex Currents in the Ionosphere and Estimation of Their Parameters Based on Ground Magnetic Data

Geomagnetism and Aeronomy - A system to process data from a 2D network of magnetic stations is proposed for the identification of eddy currents in the ionosphere and the estimation of their...     

福建省震前地基GPS TEC与掩星电子密度研究

从联合地基GPS,IEC数据和掩星电子密度剖面中,有可能检测和识别出由地震波激发而引起的电离层扰动。通过研究福建省近年已发生地震的震前地基GPS TEC与掩星电子密度,获得地震的电离层效应．为今后本省的地震预报提供前兆依据。     

Correction of Electron Density Profiles in the Low Ionosphere Based on the Data of Vertical Sounding with the IRI Model

The method of correcting the daytime vertical profiles of electron plasma frequency in the low ionosphere from International Refererence Ionosphere (IRI) model in accordance with the measured data of the virtual heights and absorption of signal radiowaves (method А1) reflected from the bottom of E-region at vertical sounding (VS) is presented. The method is based on the replacement of the IRI model profile by an approximation of analytical dependence with parameters determined according to VS data and partially by the IRI model. The method is tested by the results of four joint ground-based and rocket experiments carried out in the 1970s at midlatitudes of the European part of Russia upon the launches of high-altitude geophysical rockets of the Vertical series. It is shown that the consideration of both virtual reflection heigths and absorption makes it possible to obtain electron density distributions that show the best agreement with the rocket measurements made at most height ranges in the D- and E-regions. In additional, the obtained distributions account more adequately than the IRI model for the contributions of D- and E-regions to absorption of signals reflected above these regions.     

Parameters of the Geomagnetic Activity,Thermosphere, and Ionosphere for the Ultimately Intense Magnetic Storm

Equations of regression are derived for the intense magnetic storms of 1957?2016. They reflect the nonlinear relation between Dst_min and the effective index of geomagnetic activity Ap(τ) with a timeweighted factor τ. Based on this and on known estimations of the upper limit of the magnetic storm intensity (Dst_min =–2500 nT), the maximal possible value Ap(τ)_max ~ 1000 nT is obtained. This makes it possible to obtain initial estimates of the upper limit of variations in some parameters of the thermosphere and ionosphere that are due to geomagnetic activity. It is found, in particular, that the upper limit of an increase in the thermospheric density is seven to eight times larger than for the storm in March 1989, which was the most intense for the entire space era. The maximum possible amplitude of the negative phase of the ionospheric storm in the number density of the F₂-layer maximum at midlatitudes is nearly six times higher than for the March 1989 storm. The upper limit of the F₂-layer rise in this phase of the ionospheric storm is also considerable. Based on qualitative analysis, it is found that the F₂-layer maximum in daytime hours at midlatitudes for these limiting conditions is not pronounced and even may be unresolved in the experiment, i.e., above the F₁-layer maximum, the electron number density may smoothly decrease with height up to the upper boundary of the plasmasphere.     

Impact of Earthquakes and Tsunamis on the Ionosphere

Izvestiya, Physics of the Solid Earth - Diagnostics of the outer envelopes of the Earth through global satellite navigational systems and through the equally global network of ground receivers and...     

Generation of Geomagnetic Disturbances in the Ionosphere by a Tsunami Wave

Geomagnetism and Aeronomy - The mechanism of the generation of the geomagnetic field disturbance accompanying tsunami wave propagation is considered. Electric currents in the marine environment and...     

Assessment of the Accuracy of Calculations Using the International Reference Ionosphere Model IRI-2016: I. Electron Densities

Geomagnetism and Aeronomy - The paper quantitatively compares the results of calculations of the electron density Ne by the International Reference Ionosphere model IRI-2016 with experimental data...