Journal ArticleDOI
Anomalous radio wave absorption due to ionospheric heating effects
Kristine N. Graham,J. A. Fejer +1 more
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In this article, an ionospheric volume in the F layer subjected to high power high frequency illumination is observed to be an effective scattering medium for radio signals and a field-aligned scattering geometry is considered.Abstract:
An ionospheric volume in the F layer subjected to high power high frequency illumination is observed to be an effective scattering medium for radio signals. Experimental results are representative of a field-aligned scattering geometry. Scatter of the incident wave into electrostatic waves by these strongly field-aligned density irregularities is considered. This model explains the large decreases in radio wave reflectivity seen during the ionospheric modification.read more
Citations
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Ionospheric modification and parametric instabilities
TL;DR: In this paper, the authors derived thresholds and linear growth rates for stimulated Brillouin and Raman scattering and for the parametric decay instability by using arguments of energy transfer.
Journal ArticleDOI
State-of-the-art of elevation extraction from satellite SAR data
Thierry Toutin,Laurence Gray +1 more
TL;DR: The performance and limitations of four different methods (clinometry, stereoscopy, interferometry and polarimetry) are reviewed, as well as their applicability to different satellite SAR sensors and their advantages and disadvantages are analysed.
Journal ArticleDOI
The heating of the high lattitude ionosphere by high power radio waves
TL;DR: The role played by the anomalous absorption of the high power wave is discussed in this article, with the relative importance of collisional and anomalous heating at the high latitude site is examined.
Journal ArticleDOI
Review of ionospheric modification experiments at Tromsø
TL;DR: The most advanced results in previous heating experiments at Tromso have been obtained in the following research areas: 1) Generation of secondary electromagnetic waves at very, extremely and ultra low frequencies by amplitude modulated heating of the polar electrojet current.
Journal ArticleDOI
Ionospheric modification experiments in northern Scandinavia
Peter Stubbe,H. Kopka,H. Lauche,Michael T. Rietveld,Asgeir Brekke,O. Holt,T. B. Jones,Thompson G. Robinson,Å. Hedberg,Bo Thidé,Marcel Crochet,H.-J. Lotz +11 more
TL;DR: The Ramfjordmoen heating facility at Tromso, Norway is briefly described in this article, and a survey is given of the experiments performed with this facility until now.
References
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Journal ArticleDOI
Field-aligned scattering from a heated region of the ionosphere—Observations at HF and VHF
TL;DR: In this article, radio scattering measurements have been made of a region of the ionosphere above the Institute for Telecommunication Sciences' ionospheric heating facility at Platteville, Colorado.
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A theory of scattering by nonisotropic irregularities with application to radar reflections from the aurora
TL;DR: In this article, a model of the distribution of ionization in an aurora is developed that can explain the aspect sensitivity of radar echoes obtained at VHF during auroral activity.
Journal ArticleDOI
An ionospheric modification experiment using very high power, high frequency transmission
TL;DR: In this paper, an experiment resulting in ionospheric modification of the F region through heating by an HF transmitting facility located near Boulder, Colorado, has begun, where a transmitter capable of producing nearly 2 Mw of average power, which, when used in conjunction with a 10-element ring array antenna, results in a power-aperture product of the order of 104 Mw m².
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Effect of Ion Correlations on High-Frequency Plasma Conductivity
John M. Dawson,Carl Oberman +1 more
TL;DR: In this paper, the authors extended the elementary model to include the effects of ion correlations for arbitrary fixed ion distributions, and found that the ion shielding reduced the maximum effective impact parameter by a factor (1 + Z)−1.