Study of electron density in the ionosphere through ground reception of radio signals from space vehicles (survey)

1968 ◽  
Vol 11 (5) ◽  
pp. 357-381
Author(s):  
G. G. Getmantsev ◽  
K. I. Gringauz ◽  
L. M. Erukhimov ◽  
Yu. A. Kravtsov ◽  
N. A. Mityakov ◽  
...  
Keyword(s):  
Electron Density ◽  
Space Vehicles ◽  
Radio Signals ◽  
Ground Reception

Identification and monitoring techniques of TIDs in the H2020 TechTIDE project

2020 ◽  
Author(s):  
David Altadill ◽  
Antoni Segarra ◽  
Estefania Blanch ◽  
José Miguel Juan ◽  
Dalia Buresova ◽  
...  
Keyword(s):  
South Africa ◽  
European Commission ◽  
Electron Density ◽  
Warning System ◽  
Ionospheric Disturbances ◽  
Operational System ◽  
Horizon 2020 ◽  
Research And Innovation ◽  
Methods And Techniques ◽  
Radio Signals

<p>Traveling Ionospheric Disturbances (TIDs) are wave-like propagating irregularities that alter the electron density environment and play an important role spreading radio signals propagating through the ionosphere.</p><p>TechTIDE project, funded by the European Commission Horizon 2020 research and innovation program, is establishing a pre-operational system to issue warnings of the occurrence of TIDs over the region extended from Europe to South Africa based on the reliability of a set of TID detection methodologies.</p><p>This contribution aims at presenting the different methods and techniques of identification and tracking the activity of TIDs and their respective performance, that serve to feed the warning system of TechTIDE.</p>

The effect of ionospheric refraction on the polar diagram of a short radio antenna

1968 ◽  
Vol 303 (1473) ◽  
pp. 157-173 ◽  
Keyword(s):  
Magnetic Field ◽  
Incident Wave ◽  
Loop Antenna ◽  
Space Vehicles ◽  
Polar Diagram ◽  
The Earth ◽  
Small Dipole ◽  
Electric And Magnetic Field ◽  
Radio Signals ◽  
Small Antenna

Recently radioastronomers have used receivers in space vehicles in the upper part of the ionosphere to measure radio signals at frequencies which cannot penetrate the F region. When the results are interpreted, the effect of ionospheric refraction is important. This paper shows how to calculate the electric and magnetic field components at a point within the ionosphere when a plane unpolarized wave is incident from outside the Earth at a series of different angles. The anisotropy of the ionosphere, produced by the Earth’s magnetic field, has a profound effect on these fields. The received signal voltage across a small dipole or loop antenna can be found from these fields if the orientation of the aerial is known. Thus a given small antenna and the ionosphere together form a receiving system whose sensitivity varies with the direction of the incident wave. Diagrams showing this variation may be called polar diagrams by analogy with the diagrams often used for directive aerials. Some examples of the shapes of these diagrams are given.

scholarly journals Pulsar Scintillation: Overview and Some Recent Results

2001 ◽  
Vol 182 ◽  
pp. 25-30
Author(s):  
Yashwant Gupta
Keyword(s):  
Interstellar Medium ◽  
Electron Density ◽  
Density Fluctuations ◽  
Radio Signals ◽  
Basic Concepts ◽  
Electron Density Fluctuations

AbstractRadio signals from pulsars are significantly affected by scattering in the interstellar medium. A review of this phenomenon of pulsar scintillation forms the main objective of this paper. The basic concepts are described and some new results related to the following aspects are presented: (i) understanding of refractive scintillation effects and (ii) constraining the spectrum of electron density fluctuations in the interstellar medium.

scholarly journals Use of ultra-small space vehicles for studying near-Earth plasma by radiophysical methods

2019 ◽  
Vol 18 (1) ◽  
pp. 154-162
Author(s):  
D. V. Chugunin ◽  
A. A. Chernyshov ◽  
M. M. Mogilevsky ◽  
I. L. Moiseenko ◽  
A. A. Petrukovich
Keyword(s):  
Plasma Density ◽  
Phase Difference ◽  
Space Vehicles ◽  
Small Space ◽  
Radio Receivers ◽  
Transmitter Power ◽  
Radio Signals ◽  
Radio Transmitters ◽  
Radio Band ◽  
To Receive

The paper shows the possibility to measure plasma density and its fluctuations in the ionosphere on ultra-small space spacecraft using radiophysical methods that allow determining the characteristics of the medium through which radiation is transmitted. It is assumed that each spacecraft will have a navigational satellite receiver, as well as a device for emitting and detecting a signal at two multiple frequencies in the radio band. With this approach, information on plasma density is contained in the received phase difference. Radio receivers and radio transmitters on satellites constantly exchange radio signals and then it is possible to determine the electron concentration and its fluctuations from the phase shift. The authors obtained numerical estimates of the resulting phase difference for different frequencies from 10 MHz to 10 GHz with typical ionospheric parameters depending on the distance between the satellites. Calculations were also made to determine the maximum distance between satellites at which it is possible to receive a signal, provided that the transmitter power is 2 watts.

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