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3.345  Articles
1 of 335 pages  |  10  records  |  more records»
The work deals with the issues of the determination of the probability of frequency-selective fading (FSF) of navigational radio signals in satellite radio navigation systems under artificial ionosphere disturbances. The connection between the coherence b... see more

We investigate the variations in the ionosphere during a small geomagnetic storm on June 23, 2000, using the total electron content of the Jet Propulsion Laboratory global positioning system, and the ionospheric critical frequency. Large and long-lasting ... see more

After more than 60 years of research, ionospheric disturbances are today a most challenging topic of upper atmosphericphysics. Although the understanding of the thermosphere-ionosphere system has increased, quantitativepredictions of ionospheric perturbat... see more

High Frequency radio waves reflected by the ionosphere can provide a relevant amount of information within the composite received signal. The ionosphere is indeed a frequency dispersive, bi-refractive, absorbing medium, in which multipath propagation occu... see more

This study investigates the application of empirical mode decomposition to signals from very low frequency transmitters in Europe that were received in Thessaloniki, Greece, to provide a method for depicting seismic-ionospheric precursor phenomena that oc... see more

In the framework of seismic precursor electromagnetic investigations, we analyzed the very low frequency (VLF) amplitude signals recorded by the Instrument Champ Electrique (ICE) experiment on board the DEMETER micro-satellite. The sun-synchronous orbits ... see more

In the presence of perturbations of the thermospheric auroral region produced by traveling ionospheric disturbances during the propagation of atmospheric gravity waves, an analytical expression of the velocity of the thermospheric plasma is derived throug... see more

For the reliable performance of technologically advanced radio communications systems under geomagneticallydisturbed conditions, the forecast and modelling of the ionospheric response during storms is a high priority. Theionospheric storm forecasting mode... see more

An attempt at forecasting the magnetic activity index three hours in advance is presented. This approach is based on a suitable treatment of time-weighted accumulations of the three-hourly magnetic index Kp. The statistical analysis of impact of magnetic ... see more

1 of 335 pages  |  10  records  |  more records»