Abstract Ionospheric total electron content (TEC) is one of the key parameters for users radio-based systems, such as Global Navigation Satellite System, high-frequency communication and space-based remote sensing since ionospheric delay proportional to TEC through propagation path. It important know extreme values in readiness hazardous conditions. The purpose this study estimate with occurren...

Ducts (field-aligned plasma density enhancements) provide a link into the magnetosphere and can guide whistler waves. Inside ducts, wave-particle interactions occur efficiently; therefore, their presence contributes to removal of energetic particles from magnetosphere. We present experimental results concerning characteristics, behavior, excitation thresholds ducts induced by extraordinary (X-m...

The enhanced Polar Outflow Probe (ePOP) is scheduled to be launched as part of the Cascade Demonstrator Small-Sat and Ionospheric Polar Explorer (CASSIOPE) satellite in early 2008. A Radio Receiver Instrument (RRI) on ePOP will receive HF transmissions from various groundbased transmitters. In preparation for the ePOP mission, data from a similar transionospheric experiment performed by the Int...

Based on the results of mathematical modeling, we consider possibility to estimate plasma frequency F2 layer maximum polar ionosphere (critical frequency, foF2) using frequency-sweeping radiation from a highly elliptical spacecraft orbit in Arctic zone. Our modeling concerning energy problem radio sensing consisted analyzing wave field parameters, received strength, and SNR two paths with dista...

A multi-instrumental analysis of the meridional ionospheric response is presented over Europe during two largest ICME-driven geomagnetic storms solar cycle #24 maximum. Data from 5 European digisonde stations, ground-based Global Navigation Satellite System, Total Electron Content (GNSS TEC), ratio TEC difference (rTEC), as well Swarm and Thermosphere, Ionosphere, Mesosphere, Energetics Dynamic...

The behavior of the Brazilian equatorial ionosphere during solar minimum periods, 1996 and 2009, which cover cycles 22/23 23/24, respectively, is investigated. For this, F2 layer critical frequency (foF2) peak height (hmF2) registered by a Digisonde operated at São Luis (2.33° S; 44° W) are carefully analyzed. results show that seasonal mean values foF2 hmF2 in equinoxes winter 2009 were lower ...