Journal ArticleDOI
Coordinated measurements of low-energy electron precipitation and scintillations/TEC in the auroral oval
Sunanda Basu,E. MacKenzie,Santimay Basu,H. C. Carlson,D. A. Hardy,Frederick J. Rich,R. C. Livingston +6 more
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TLDR
A case study of coordinated observations of low-energy (10 radians for fluctuation frequencies >00067 Hz) were found to be well correlated with intense fluxes (>109 particles (cm2 s sr)−1) of precipitated low energy electrons as discussed by the authors.Abstract:
A case study of coordinated observations of low-energy ( 10 radians for fluctuation frequencies >00067 Hz) were found to be well correlated with intense fluxes (>109 particles (cm2 s sr)−1) of precipitated low-energy electrons Total electron content and magnetometer measurements indicate that the onset of the precipitation event was about 10 min prior to the DMSP pass Within this time scale, the ionization generated in the F region could reach the topside so that the thermal sensor on board the DMSP satellite was able to measure a factor of 2–3 density enhancement at 840 km The latitudinal width of these density structures is consistent with that of F region blobs observed at Chatanika The gradient scale length measured in the topside was only 30 km, which was probably responsible for the fast growth rate of the scintillation-producing irregularities The phase to amplitude scintillation ratio changed rather drastically compared to quiet magnetic times, however, implying that increased convection velocities during these magnetic disturbances were partially responsible for the enhanced phase scintillationread more
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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 effects of major magnetic storms during the International Space Weather Period of September and October 1999: GPS observations, VHF/UHF scintillations, and in situ density structures at middle and equatorial latitudes
Sunanda Basu,Santimay Basu,Cesar E. Valladares,H.-C. Yeh,S.-Y. Su,E. MacKenzie,P. J. Sultan,Jules Aarons,Frederick J. Rich,Patricia H. Doherty,Keith M. Groves,Terence Bullett +11 more
TL;DR: In this article, the ionospheric effects of a halo coronal mass ejection (CME) initiated on the Sun on September 20, 1999, and causing the largest magnetic storm during this month on September 22, 23, and 24, 1999 were studied through their effects on a prototype of a Global Positioning System (GPS)-based navigation system called Wide Area Augmentation System (WAAS) and their impact on global VHF/UHF communication systems.
Journal ArticleDOI
Global positioning system phase fluctuations at auroral latitudes
TL;DR: In this paper, the authors used observations of a diversity of propagation paths of Global Positioning System satellites from each of 11 high-latitude stations to determine the behavior pattern for the development of phase fluctuations in the auroral and subauroral irregularity regions.
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First observations of intense GPS L1 amplitude scintillations at midlatitude
TL;DR: The first observations of GPS L1 amplitude scintillation activity in the midlatitude ionosphere at latitudes corresponding to the northeastern United States have been made as discussed by the authors, where a modified GPS receiver was used to record GPS satellite signal strength at Cornell University (53.2° magnetic latitude).
Nonlinear evolution of plasma enhancements in the auroral ionosphere 1: Long wavelength irregularities
M. J. Keskinen,S. L. Ossakow +1 more
TL;DR: In this article, the linear stability and nonlinear evolution of plasma enhancements in arbitrary ambient electric fields in the diffuse auroral F region ionosphere have been studied using analytical and numerical simulation techniques.
References
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Journal ArticleDOI
Auroral ionization and excitation by incident energetic electrons
TL;DR: In this paper, the luminosity profiles for the N 2 + 1 N.G. (0, 0) band are predicted for various energy distributions of auroral electrons in the energy range 0.4 to 300 keV.
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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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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.
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Instability of a Partially Ionized Plasma in Crossed Electric and Magnetic Fields
TL;DR: In this article, a weakly ionized plasma in a uniform magnetic field is considered and it is shown that this steady state is unstable if the plasma density is nonuniform in the direction of the applied electric field and if the applied potential is large enough.
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.