Journal ArticleDOI
A persistent subauroral scintillation enhancement observed in Alaska
TLDR
The most persistent, identifiable feature on intensity and phase scintillation records of coherent beacon signals recorded near Fairbanks, Alaska during several months in 1976 is a narrow region of enhanced Scintillation to the south of the station, suggesting that it could be a geometric enhancement produced by fieldaligned irregularities as mentioned in this paper.Abstract:
The most persistent, identifiable feature on intensity and phase scintillation records of coherent beacon signals recorded near Fairbanks, Alaska during several months in 1976 is a narrow region of enhanced scintillation to the south of the station. On high-elevation passes the feature occurs near the magnetic zenith, suggesting that it could be a geometric enhancement produced by field-aligned irregularities. The feature also occurs, however, on medium and low-elevation passes when the minimum off-field angle is several tens of degrees. The observations, therefore, represent evidence for either (1) a hitherto unrecognized irregularity enhancement or layer thickening in the subauroral ionosphere, or (2) longitudinally extended irregularity sheets.read more
Citations
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High-Latitude F-Region Irregularities: A Review and Synthesis
TL;DR: In this article, the authors synthesize a descriptive model of plasma structures in the high-latitude F layer that unifies most of the diverse and independent observations, including the formation of 1000 km-scale "patches" in the polar cap from solar-produced plasma that is transported poleward from lower latitudes; the reconfiguration of patches as they convect into the auroral region and become the latitudinally confined, but longitudinally extended, plasma density enhancements near the equatorward auroral boundary; and the production of localized enhancements and depletions
Journal ArticleDOI
Ionospheric constraints on VHF/UHF communications links during solar maximum and minimum periods
TL;DR: In this article, an extensive VHF/UHF scintillation data base covering the frequency range of VHF to a few gigahertz has been utilized to determine the magnitudes of phase and intensity scintillations and their temporal/spatial structures during the sunspot maximum and minimum periods.
Journal ArticleDOI
Theories of high-latitude ionospheric irregularities: A review
M. J. Keskinen,S. L. Ossakow +1 more
TL;DR: An overview of theories of naturally occurring high latitude E and F region ionospheric irregularities can be found in this article, where the authors focus on E region irregularity phenomena and summarize the recent and previous theoretical literature dealing with F region irregularities.
Journal ArticleDOI
Current convective instability in the diffuse aurora
S. L. Ossakow,P. K. Chaturvedi +1 more
TL;DR: In this article, the authors investigated a simple plasma fluid model and found that instability results for -kxV/sub d/>kx (cE/sub o/B/sub O/) (..nu../sub i//..cap omega../sub I/) where V/subd/ is the relative drift (precipitation current) between ions and electrons along B/subO/, E/sub
Theories of high latitude ionospheric irregularities: A review
M. J. Keskinen,S. L. Ossakow +1 more
TL;DR: An overview of theories of naturally occurring high latitude E and F region ionospheric irregularities can be found in this paper, where the authors focus on E region irregularity phenomena and summarize the recent and previous theoretical literature dealing with F region irregularities.
References
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Journal ArticleDOI
On the variation of radio star and satellite scintillations with zenith angle
B.H. Briggs,I.A. Parkin +1 more
TL;DR: The theory of the variation of the depth of amplitude scintillations with the zenith angle of the source is considered in this article, for radio waves received from a star or a satellite.
Journal ArticleDOI
Early results from the DNA Wideband satellite experiment—Complex‐signal scintillation
E. J. Fremouw,R. L. Leadabrand,R. C. Livingston,M. D. Cousins,C. L. Rino,B. C. Fair,R. A. Long +6 more
TL;DR: In this article, the authors present early results of the observations; salient points include the following, most of the data are consistent with phase-screen modeling of the production of ionospheric scintillation, including an ƒ−2 frequency dependence for phase variance.
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Chatanika, Alaska, Auroral‐Zone Incoherent‐Scatter Facility
TL;DR: In this article, the operational status of an auroral-zone incoherent-scatter radar is reported, where the siting of the radar is such that D-, E-, and F-region incoherentscatter measurements can be made without ground clutter interference.
Journal ArticleDOI
Deformation and striation of plasma clouds in the ionosphere: 2. Numerical simulation of a nonlinear two-dimensional model
TL;DR: In this paper, a coupled pair of nonlinear partial differential equations that describe the self-consistent evolution transverse to the magnetic field of plasma clouds artificially formed in the ionosphere is presented and solved numerically.