scholarly journals Investigation of small‐scale electron density irregularities observed by the Arase and Van Allen Probes satellites inside and outside the plasmasphere

2021 ◽  
Author(s):  
Neethal Thomas ◽  
Kazuo Shiokawa ◽  
Yoshizumi Miyoshi ◽  
Yoshiya Kasahara ◽  
Iku Shinohara ◽  
...  
Keyword(s):  
Electron Density ◽  
Small Scale ◽  
Van Allen Probes ◽  
Electron Density Irregularities

scholarly journals Ionospheric precursors to scintillation activity

2014 ◽  
Vol 57 (1) ◽  
Author(s):  
Paul S.J. Spencer
Keyword(s):  
Electron Density ◽  
Ionospheric Scintillation ◽  
Small Scale ◽  
Navigation Systems ◽  
Radio Waves ◽  
Ionospheric Electron Density ◽  
Plasma Drift ◽  
L Band ◽  
Electron Density Irregularities ◽  
Tomographic Inversions

<p>Ionospheric scintillation is the rapid fluctuation of both phase and amplitude of trans-ionospheric radio waves due to small scale electron density irregularities in the ionosphere. Prediction of the occurrence of scintillation at L band frequencies is needed to mitigate the disruption of space-based communication and navigation systems. The purpose of this paper is to present a method of using tomographic inversions of the ionospheric electron density obtained from ground-based GPS data to infer the location and strength of the post-sunset plasma drift vortex. This vortex is related to the pre-reversal enhancement in the eastwards electric field which has been correlated to the subsequent occurrence of scintillation.</p>

scholarly journals Spatial structure of auroral day-time ionospheric electron density irregularities generated by a powerful HF-wave

1998 ◽  
Vol 16 (7) ◽  
pp. 812-820 ◽  
Author(s):  
E. D. Tereshchenko ◽  
B. Z. Khudukon ◽  
M. T. Rietveld ◽  
A. Brekke
Keyword(s):  
Statistical Analysis ◽  
Radio Wave ◽  
Electron Density ◽  
Large Scale ◽  
Density Fluctuations ◽  
Small Scale ◽  
Ionospheric Heating ◽  
Mean Values ◽  
Hf Wave ◽  
Electron Density Irregularities

Abstract. We describe an experiment in satellite radio-wave probing of the ionosphere, modified by powerful waves from the HF heating facility at Tromsø (Norway) in May 1995. Amplitude scintillations and variations of the phase of VHF signals from Russian navigational satellites passing over the heated region were observed. We show that both large-scale electron density irregularities (several tens of kilometers in size) and small-scale ones (from hundreds of meters to kilometers) can be generated by the HF radiation. Maximum effects caused by small-scale irregularities detected in the satellite signals are observed in the directions sector approximately parallel to the geomagnetic field lines although large-scale structures can be detected within a much larger area. The properties of small-scale irregularities (electron density fluctuations) are investigated by applying a statistical analysis and by studying experimental and model mean values of the logarithm of the relative amplitude of the signal. The results indicate that satellite radio probing can be a supporting diagnostic technique for ionospheric heating and add valuable information to studies of effects produced by HF modification.Key words. Satellite radio-wave probing · HF radiation · Electron density irregularities · Statistical analysis · Ionospheric heating

On reflexion and trapping of upper-hybrid waves

1983 ◽  
Vol 29 (2) ◽  
pp. 195-215 ◽  
Author(s):  
Einar Mjølhus
Keyword(s):  
Magnetic Field ◽  
Singular Perturbation ◽  
Radio Wave ◽  
Perturbation Technique ◽  
Magnetized Plasma ◽  
Small Scale ◽  
Hybrid Wave ◽  
Singular Perturbation Technique ◽  
Hybrid Waves ◽  
Electron Density Irregularities

The theme of the paper is the relation between the so-called Z mode and the upper-hybrid wave in a magnetized plasma. First, certain problems as to reflexion and transmission of upper-hybrid waves at quasi cut-off (that is, cut-off predicted within electrostatic approximation) are stated and solved by singular perturbation technique. Then the theory is extended to a problem concerning generation and trapping of upper-hybrid waves in magnetic field aligned electron density irregularities. First a single density depression is considered, and then the formalism is further extended to a system of many parallel density depressions. The study was motivated by problems in the theory of artificial small-scale ionospheric irregularities occurring in radio wave experiments.

Sign in / Sign up

Export Citation Format

Share Document