Results 191 to 200 of about 22,029 (223)

The Lorentz “polarization”‐correction in the ionosphere

Terrestrial Magnetism and Atmospheric Electricity, 1939
The authors discuss criticisms by Appleton, Farmer, and Ratcliffe, and by Booker and Berkner of their former conclusion that the Lorentz polarization‐term is zero in the ionosphere. They advance further experimental facts in support of their viewpoint, and criticize the views of AFR in detail.
D. F. Martyn, G. H. Munro
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HF-driven currents in the polar ionosphere

2011 XXXth URSI General Assembly and Scientific Symposium, 2011
Ionospheric heaters located in the polar-regions (EISCAT, HAARP, HIPAS) have generated waves in the ULF/ELF/VLF range by modulating the auroral electrojet at D/E region altitudes in a concept termed by the EISCAT group as the Polar Electrojet (PEJ) antenna.
K. Papadopoulos, N. A. Gumerov, X. Shao, I. Doxas, C. L. Chang   +4 more
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Ionospheric Measurements in the Polar Regions

Nature, 1934
THIS note is a brief account of the results of wireless observations made in connexion with the International Polar Year 1932–33 at Murmansk (lat. 68° 56 N., long. 33° 05′ E.) in the U.S.S.R. during June, July and August 1933. This work was organised by the Leningrad Section of the Institute for Scientific Research of the People's Commissariat for ...
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Solar corpuscular radiation and polar ionospheric disturbances

Journal of Geophysical Research, 1960
Study of disturbances in the polar inosphere yields considerable evidence of the existence of energetic solar particles associated with solar flares. Radio blackouts due to enhanced ionizations are classified into two characteristic types: the polar-cap blackout, and the auroral-zone blackout.
Tatsuzo Obayashi, Yukio Hakura
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Horizontal gradients in the polar ionosphere

Journal of Geophysical Research, 1969
Polar Ionosphere Beacon Satellite S-66 signals measured for large scale horizontal gradients in total electron content of Antarctic ionosphere at sunspot minimum and ...
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Field-aligned Currents in the Undisturbed Polar Ionosphere

pure and applied geophysics, 1989
Field-aligned currents, FAC’s, which couple ionospheric currents at high latitudes with magnetospheric currents have become an essential cornerstone to our understanding of plasma dynamics in the polar region and in the earth’s magnetosphere. Initial investigators of polar electrodynamics including the aurora were unable to distinguish between the ...
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Interactions Between the Polar Ionosphere and Thermosphere

Physica Scripta, 1987
The temperature, composition and circulation of the ionosphere and thermosphere in the polar regions are closely coupled and display a marked variation with altitude, latitude, longitude, universal time, season, solar cycle, and geomagnetic activity. To a large degree, this variation is a consequence of the effect that magnetospheric electric fields ...
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Residual ionization in the polar lower ionosphere

Journal of Geophysical Research, 1962
S>Turbulent scattering of 2.3 Mc/s radio waves is found to persist throughout the polar night between altitudes of 80 and 100 km at a geomagnetic latitude of 79 deg S. Residual electron densities are estimated to increase from 5/cm/sup 2/ at 80 km to 1 or 2 x 10/sup 2/ between 90 and 100 km.
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Ionospheric dynamics in the central polar cap

Advances in Space Research, 1998
Abstract The Eureka polar observatory located near the northern magnetic pole permits a quasi-continuous optical view of the central polar region down to 80° corrected geomagnetic latitude, through the dark winter night from November through February.
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Global Effects of a Polar Solar Eclipse on the Coupled Magnetosphere‐Ionosphere System

Geophysical Research Letters, 2021
Xuetao Chen, Tong Dang, Bin-Zheng Zhang
exaly