In this work the response of the ionosphere due to the severe magnetic storm of 7–10 November 2004 is investigated by analyzing GPS Total Electron Content (TEC) maps constructed for the South America sector. In order to verify the disturbed zonal electric fields in South America during the superstorm, ionospheric vertical drift data obtained from modeling results are used in the analysis. The v...

In this Perspective article discussing solved and unsolved problems in space physics, the focus is on problem of spatial-temporal variability magnetospheric plasma waves that produce atmospheric luminosity pulsating aurora. particular outstanding issue what causes variations chorus-wave intensities highlighted: Two great unknowns are (1) how does it work (2) controlling factors. The point made ...

By using fast ionogram observations, we report the first simultaneous observations of ascending ion layers at equatorial and low latitudes. The ionosonde measurements Sanya (18.3°N, 109.6°E; dip lat. 12.2°N) Chumphon (10.7°N, 99.4°E; 3.8°N) show that a high Es layer, which might contain metallic ions, was directly lifted upward from local E region to F bottomside morning hours, in pattern simil...

Recent measurements of GPS-derived total electron content (TEC) reveal acoustic wave periods of ∼1–4 min in the F region ionosphere following natural hazard events, such as earthquakes, severe weather, and volcanoes. Here we simulate the ionospheric responses to infrasonic-acoustic waves, generated by vertical accelerations at the Earth’s surface or within the lower atmosphere, using a compress...

The equatorial plasma bubble (EPB) phenomenon is an important component of space weather as the ionospheric irregularities that develop within EPBs can have major detrimental effects on operation satellite-based communication and navigation systems. Although name suggests occur in ionosphere, nature instability gives rise to such bubbles may extend over a large part global ionosphere between ge...

[1] Saturn’s magnetic field is remarkably axisymmetric. Early evidence for nonaxisymmetry came from the periodicity of Saturn’s kilometric radio bursts (SKR). Subsequently, percent-level variations of the SKR period were found to occur on timescales of years. A recent breakthrough has been the direct detection of a nonaxisymmetric component of the field that rotates with a period close to that ...

In the paper within the approximation of the two-fluid magnetohydrodynamics and geometrooptical approximation the dispersion relation was found for ionacoustic instabilities of the ionospheric plasma at 80-200km altitudes in threedimensional weakly irregular ionosphere. Low freqeuncy solution was found. The difference between obtained and standard solution becomes significant at altitudes above...

This paper introduces a novel technique that uses observation data from GNSS to estimate the ionospheric vertical total electron content (VTEC) using Kriging–Kalman method. The provides method validate accuracy of Ionospheric VTEC analysis within Equatorial Ionization anomaly region. developed alongside solar parameters, such as radio flux (F10.7 cm), Disturbance Storm Time (Dst) and other data...

[1] In this paper, the total electron content (TEC) of the global ionosphere map (GIM) is used to detect seismoionospheric anomalies associated with the 12 January 2010 M7 Haiti earthquake, and an ionospheric model is applied to simulate the detected anomalies. The GIM temporal variation shows that the TEC over the epicenter significantly enhances on 11 January 2010, 1 day before the earthquake...

A new inverse diffraction algorithm has been developed to estimate the fine-scale ionospheric electron density variations that cause equatorial scintillation in GPS signals. This work is part of an effort to image the disturbed ionosphere in order to better understand scintillation from a scientific standpoint. The new algorithm relies on a physical model of how electron density irregularities ...