Results 181 to 190 of about 4,627 (227)

The topside ionosphere during geomagnetic storms

Proceedings of the IEEE, 1969
The state of knowledge of ionospheric storms in the topside ionosphere is reviewed. Although much remains to be understood concerning ionospheric storms, many of the storm-time phenomena can be interpreted in terms of drift motions produced by storm-time currents, and by ambipolar diffusion.
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Equatorial hiss in the topside ionosphere

Journal of Geophysical Research: Space Physics, 1979
Equatorial hiss seen in the topside ionosphere by the Dartmouth experiment on Ogo 6, using an electric dipole antenna, is described. The observations are consistent with wave normal positions intermediate between the geomagnetic field and the resonance cone.
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Transversely accelerated ions in the topside ionosphere

Journal of Geophysical Research: Space Physics, 1994
Data from the rocket campaigns MARIE and TOPAZ III, within regions of low‐altitude transversely accelerated ions, are interpreted to explain the acceleration of the ions. Using the Monte Carlo kinetic technique to evaluate the ion heating produced by the simultaneously observed lower hybrid waves, we find that their observed electric field amplitudes ...
John M. Retterer, Tom Chang, J. R. Jasperse   +2 more
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Positive ions in the topside ionosphere

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1968
The satellite Ariel I, launched in April 1962, provided a survey of the topside ionosphere over a latitude range of ± 55°. The measurements made by the ion energy spectrometer showed the ions O + and He + to be the major massive components of the ionosphere and enabled a global study of the ...
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Ion temperature profile in the topside ionosphere

Journal of Geophysical Research, 1966
Ion temperature measurements around 1000 km altitude, using ion energy analyzer and mass spectrometer mounted on ...
William C. Knudsen, Gerald W. Sharp
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Ionospheric topside sounding.

Science (New York, N.Y.), 2010
Over the past few years, the satellite topside sounders have significantly contributed to the understanding of the upper ionosphere. A great quantity of radio echo data has been accumulated, from which the ionospheric electrondensity distribution can be determined. The topside measurements of electron density essentially agree with similar measurements
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Ray tracing studies for the topside ionosphere

Journal of Geophysical Research, 1969
Nonvertical propagation effects on high altitude topside ionosphere sounder data reduction, using ray ...
Lawrence Colin, Jerry Shmoys, Geraldine McCulley   +2 more
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Transequatorial diffusion in the topside ionosphere

Planetary and Space Science, 1967
Abstract An estimate is made of the rate at which plasma diffuses along field lines in the topside ionosphere, using a simplified model. It appears that diffusion can, within hours, remove north-south asymmetry in the electron distribution in the equatorial F2-layer.
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Plasma bubble phenomenon in the topside ionosphere

Advances in Space Research, 2007
Abstract There are the indications that plasma bubbles/flux tube aligned plasma density depletions, produced by Rayleigh–Taylor instability at the bottomside of ionosphere, could rise up to the topside ionosphere and plasmasphere. Maruyama and Matuura [Maruyama, T., Matuura, N.
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The seasonal behaviour of the topside ionosphere

Journal of Atmospheric and Terrestrial Physics, 1968
Alouette topside sounder data acquired over North America during the solstice periods of 1962 and 1963 indicate that, over a wide range of middle latitudes, the midday electron concentration values at various fixed heights (400, 600, 800 and 1000 km) are always substantially greater, by a factor of about two, at midsummer than at midwinter.
J.W. King, G.L. Hawkins, C. Seabrook
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