Results 241 to 250 of about 35,368 (282)

Meteorological effects of ionospheric disturbances from vertical radio sounding data

Journal of Atmospheric and Solar-Terrestrial Physics, 2015
Abstract We studied ionospheric disturbances caused by the wave-like processes in the middle atmosphere. The ionospheric data were obtained from continuous measurements with the DPS-4 vertical sounding ionosondes in Irkutsk and Norilsk over 2008–2010.
M.A. Chernigovskaya, B.G. Shpynev, K.G. Ratovsky   +2 more
openaire   +1 more source

Time variations of polarisation characteristics of HF radio signals during vertical and near-vertical incedence sounding of the ionosphere

2020 7th All-Russian Microwave Conference (RMC), 2020
The paper describes the equipment of the monostatic chirp ionosonde “Ionosonde-MS” upgraded in order to perform routine polarization measurements during vertical incidence and near-vertical incidence sounding of the mid-latitude ionosphere over the Asian part of Russia using a continuous chirp signal.
Vladimir I. Kurkin, Alexey V. Podlesnyi, Mark V. Cedrik   +2 more
openaire   +1 more source

Peculiarities of the inverse problems of vertical radio sounding of the ionosphere

Advances in Space Research, 1988
Abstract At the interpretation of ionograms (obtained by ground-based or satellite soundings) in terms of electron density, or at that of absorption measurements in terms of an effective electron collision frequency or at that of Doppler measurements in terms of plasma motions, problems arise which might be seen as comparable in character.
N.P. Danilkin, P.F. Denisenko, V.V. Sotsky   +2 more
openaire   +1 more source

Determination of sporadic E radio wave propagation parameters based on vertical and oblique sounding

Advances in Space Research, 2015
© 2015 COSPAR. Published by Elsevier Ltd. All rights reserved. Sporadic E layer is often determined for HF radio communication. We have to deal with oblique radiowave propagation in the radio practice. The limiting frequencies at oblique propagation depend heavily on the transmitter power and the receiver sensitivity.
Sherstyukov O., Akchurin A., Sherstyukov R.   +2 more
openaire   +3 more sources

The effects of powerful oblique radio transmission on the ionosphere on vertical sounding data

Journal of Atmospheric and Solar-Terrestrial Physics, 1997
Abstract Results of experiments measuring the effects of a powerful oblique HF radio transmission on the ionosphere are described. In one experiment carried out in 1991 on a longitudinal path in the south-west part of the U.S.A., additional traces were found on vertical sounding (VS) ionograms generated by an ionosonde located near the mid-point of ...
G.S. Bochkarev, I.V. Krasheninnikov, G.S. Sales   +2 more
openaire   +1 more source

Errors in Estimating of the F2-Layer Peak Parameters in Automatic Systems for Processing the Ionograms in the Vertical Radio Sounding of the Ionosphere under Low Solar Activity Conditions

Geomagnetism and Aeronomy, 2021
The article analyzes the errors in estimating the parameters of the main ionospheric maximum, plasma frequency foF2 and its height hmF2, by automated systems for processing the vertical radio sounding data of the ionosphere at the IZMIRAN station in 2018, during a period of low solar activity.
I. V. Krasheninnikov, L. N. Leshchenko
openaire   +1 more source

Determining Higher-Order Cumulants of Sea-Surface Slopes by Quasi-Vertical Radio Sounding Data

Moscow University Physics Bulletin, 2019
This paper analyzes the possibilities and constraints in determining the skewness and kurtosis of slopes by radio sounding data at angles at which the backscattered signal is determined by quasi-specular reflection. It is shown that direct recovery of skewness and kurtosis based on the dependence of the normalized backscattering cross section on the ...
K. V. Pokazeev, A. S. Zapevalov
openaire   +1 more source

A comparison of the thermospheric wind dynamics using transionospheric and vertical incidence radio sounding data

Advances in Space Research, 1996
Abstract In Nov 1990 in Irkutsk (52°N, 102°E), within the Super WAGS Program, measurements were made of parameters of motion of travelling ionospheric disturbances (TID's) at ionospheric heights using two measuring techniques for the Doppler shift of frequency and angles of arrival at vertical-incidence radio sounding at 2.6–6.4MHz and reception of ...
E.L. Afraimovich, B.O. Vugmeister, A.D. Kalikhman   +2 more
openaire   +1 more source

On the possibility of quasi-vertical radio sounding of the ionosphere in the extremely low frequency band

JETP Letters, 2007
The experimental measurements show that the state of the ionosphere pronouncedly affects the field of the extremely low frequency (ELF) band in the transition zone. The measurements were performed on the Kola Peninsula at different times of day and in different seasons of 2006. The observed seasonal variations in the results are larger than the diurnal
E. D. Tereshchenko, V. F. Grigor’ev, A. E. Sidorenko, A. N. Milichenko, A. V. Mol’kov, L. A. Sobchakov, A. V. Vasil’ev   +6 more
openaire   +1 more source

Registration of Minute Changes in the Critical Frequency of the F2 Layer by the Ionosonde of Vertical Radio Sounding

2019 Radiation and Scattering of Electromagnetic Waves (RSEMW), 2019
the idea and the first results of experiments on the registration of the critical frequency of layer F2 in the Earth's ionosphere with an interval of one minute to determine the coefficient of minute unsteadiness of the ionosphere and its dependence on time are presented.
Nadezhda G. Kotonaeva, Ilia V. Romanov, Petr V. Nikolaev, Elena N. Khotenko   +3 more
openaire   +1 more source