Journal ArticleDOI
Model computations of radio wave scintillation caused by equatorial ionospheric bubbles
A. W. Wernik,C. H. Liu,K. C. Yeh +2 more
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TLDR
In this paper, the effects of radio propagation through equatorial ionospheric bubbles are simulated by solving the parabolic equation numerically, and the results show that even though the amplitude scintillation at 136 MHz appears to be stationary, such is not the case at gigahertz frequencies.Abstract:
In situ data measured on board AE satellites and rockets reveal spiky and wedgelike electron density structures inside the equatorial ionospheric bubbles. Two models are constructed to simulate the initial stage and fully developed stage of a bubble. Effects of radio propagation through such bubbles are simulated by solving the parabolic equation numerically. The results show that even though the amplitude scintillation at 136 MHz appears to be stationary, such is not the case at gigahertz frequencies. Instead, the amplitude at gigahertz frequencies shows outbursts with large excursions whenever the direct ray intersects the spicky ionization structure. Both the peak-to-peak excursion and the amplitude distribution cannot be predicted by the scintillation theory that assumes the medium to be random.read more
Citations
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Journal ArticleDOI
Global morphology of ionospheric scintillations
TL;DR: In this article, a review of the available amplitude and phase scintillation data is presented, where the effect of magnetic activity, solar sunspot cycle, and time of day is shown for each three latitudinal sectors.
Journal ArticleDOI
Multiple phase-screen calculation of the temporal behavior of stochastic waves
TL;DR: In this article, an analytical/numerical technique is presented that provides a solution to the parabolic wave equation and allows for direct calculation of the received time-domain signal after propagation of a widebandwidth waveform through a turbulent ionized medium.
Journal ArticleDOI
Equatorial scintillations—a review
TL;DR: In this paper, the authors reviewed recent observations of equatorial scintillations with an emphasis on GHz measurements and explored the steep spatial gradients observed in in-situ data and their relationship to intense GHz scintillation.
Journal ArticleDOI
Simultaneous Rocket-Borne Beacon and In Situ Measurements of Equatorial Spread F - Intermediate Wavelength Results
TL;DR: In this paper, the authors report the results of spectrally analyzing the beacon phase-scintillation and Langmuir probe data and suggest that refinements in the current theories of equatorial spread F near and above the F region peak are needed.
Journal ArticleDOI
Coordinated study of equatorial scintillation and in situ and radar observations of nighttime F region irregularities
TL;DR: In this paper, a coordinated set of Atmospheric Explorer E (AE-E) satellite in situ, VHF radar backscatter, and scintillation measurements performed during 1977 over a common ionospheric volume is used to study the relationship between the plasma depletions or bubbles, the extended 3-m irregularity structures known as plumes, and bursts of SCINTillation activity or patches in the nighttime equatorial F region.
References
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Journal ArticleDOI
Some Aspects of Diffraction Theory and their Application to the Ionosphere
TL;DR: In this paper, the Fourier approach is extended to deal with problems of ''random'' diffraction, for which purpose the use of auto-correlation functions is introduced and explained in physical terms.
Investigation of molecular motions in supercooled liquids by Mossbauer scattering D C Champeney and F W D Woodhams Some Aspects of Diffraction Theory and their Application to the Ionosphere
J A Ratcliffe,D C Champeney +1 more
TL;DR: In this article, the Fourier approach is extended to deal with problems of ''random'' diffraction, for which purpose the use of auto-correlation functions is introduced and explained in physical terms.
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A power law phase screen model for ionospheric scintillation: 2. Strong scatter
TL;DR: In this article, the weak scatter scintillation theory is reformulated to show explicitly the ramifications of an arbitrarily large ionospheric outer scale, which is applied to representative data sets from the Wideband satellite.
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Plasma bubbles and irregularities in the equatorial ionosphere
TL;DR: This paper observed large-scale (10 to 200-km) irregular biteouts of up to three orders of magnitude in the ion concentration in the nighttime equatorial F region associated with small-scale inhomogeneities in ion concentration.