In this paper we evaluate the performance of singlefrequency, single-point positioning processors with an emphasis on ionospheric delay handling. A number of least-squares processors with singlefrequency code-only and code-and-carrier-phase observables were developed. Processing model hierarchy is based on measurement error handling, starting with a basic code-based navigation solution and prog...

Modelling of the ionospheric-plasmaspheric electrondensity height profile N(h), as well as other parameters like the ion composition or electron and ion temperatures, over the whole altitude range for all geographical positions, time spans, and geophysical conditions is an essential part of ionospheric physics and a critical element in the development of practical schemes for ionospheric space ...

There is some intriguing research about whether large magnitude earthquakes are associated with ionospheric changes caused by electromagnetic signals released by the crushing of rock and their crystalline structures. If so then ionospheric changes might be a mechanism for major earthquake prediction. Prior to some recent quakes, scientists have detected electromagnetic and other disturbances in...

I am a low frequency radio astronomer, not an ionospheric physicist. Therefore, I struggle with the ionosphere and know about it only in the sense of “know thy enemy”. Much of what I say in this note is probably naive from the standpoint of ionospheric physics. Nevertheless, I hope that some of my suggestions may prove to be useful.

A recursive approach for the compensation of the ionospheric phase contamination is proposed based on multistage Taylor expansion and the extended Kalman filter. The proposed algorithm can dynamically compensate the ionospheric phase contamination. We show by numerical examples that the proposed algorithm outperformances the conventional methods such as the polynomial phase signal (PPS) and the...

A modeling method is proposed to derive a two-dimensional ionospheric layer conductivity, which is appropriate to obtain a realistic solution of the polar-originating ionospheric current system including equatorial enhancement. The model can be obtained by modifying the conventional, thin shell conductivity model. It is shown that the modi®cation for one of the non-diagonal terms (Shu) in the c...

[1] The ionospheric O+ outflow varies dramatically during geomagnetic activities, but the influence of its initial characteristics on the magnetospheric dynamics has not been well established. To expand a previous study on the impact of ionospheric heavy ions outflow originating from different source regions on the magnetotail dynamics and dayside reconnection rate, this study conducts two idea...