Results 131 to 140 of about 1,563 (166)

Thermal diffusion in the topside ionosphere

Planetary and Space Science, 1967
Abstract It is shown that thermal diffusion profoundly affects ion density gradients in the topside of the ionosphere. For charged particle temperatures increasing with altitude the effect is to decrease the He+ and H+ density gradients at altitudes where O+ is the major ion and to increase (algebraically) the He+ and O+ density gradients at ...
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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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Disturbances of the topside ionosphere caused by typhoons

Geomagnetism and Aeronomy, 2010
The measurements on board the Cosmos-1809 satellite of various parameters of the topside ionosphere plasma during more than ten typhoons in various regions are analyzed. It is shown that specific zones of increased pressure of the electron gas, electric field, and intense ion oscillations are formed during the intensification stage.
N. V. Isaev, V. M. Kostin, G. G. Belyaev, O. Ya. Ovcharenko, E. P. Trushkina   +4 more
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A regular disturbance in the topside ionosphere

Journal of Geophysical Research, 1969
Continuous records of the electron content of the ionosphere, obtained over a period of several years, have shown that a large disturbance occurs between 10 P.M. and 1 A.M. on about half the nights in summer. After an initial small decrease, the electron content increases rapidly by about 30% and occasionally up to 80%. The increase lasts for 15 to 100
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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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On a possible seismomagnetic effect in the topside ionosphere

Advances in Space Research, 2015
Abstract In this paper we present the results of the computation of the electric and magnetic fields produced in the ionosphere by the near-earth seismogenic disturbance in the vertical atmospheric electrostatic field under different ionospheric conditions.
V.V. Hegai, V.P. Kim, J.Y. Liu
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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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Ionospheric irregularities observed by topside sounders

Proceedings of the IEEE, 1969
Topside sounders observe electron-density irregularities in the ionosphere with dimensions of hundreds of meters to many kilometers across the magnetic field. Most irregularities are elongated and may extend thousands of kilometers along the field. The variation of electron density is normally a few percent or less.
W. Calvert, J.M. Warnock
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Anisotropy of electron temperature in the topside ionosphere

Advances in Space Research, 1988
Abstract Anisotropy of electron temperature was detected by means of three planar probes which were installed on the polar orbiting satellite ‘OHZORA’. Generally, the electron temperature parallel to the geomagnetic line of force, T∥, is higher than the electron temperature which is perpendicular to the geomagnetic line of force, T⊥.
K.-I. Oyama, T. Abe, S. Watanabe
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The density of O2+ ions in the topside ionosphere

Planetary and Space Science, 1970
Abstract Over a significant range of altitude in the topside ionosphere the drift velocity of O 2+ ions is controlled by the motion of the dominant O + ions because the diffusion coefficient is too small to permit the doubly-charged ions to diffuse relative to the ambient plasma. Since it is not very likely that chemical recombination of O 2+ ions
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