Results 171 to 180 of about 408,077 (211)
Some of the next articles are maybe not open access.
GPS ionospheric imaging of the north polar ionosphere on 30 October 2003
Advances in Space Research, 2005Abstract Maps of electron content retrieved from a 3-dimensional assimilation process of GPS TEC measurements are applied to observe the north polar ionosphere in the evening of 30 October 2003. Their reliability for large-scale imaging is discussed in comparison with GPS data coverage and radar observations.
Stolle, C. +7 more
openaire +3 more sources
On the rotation of the polar ionospheric regions
Journal of Geophysical Research, 1960The possibility of magnetic coupling between the polar regions of the earth's ionosphere and the interplanetary gas has led to the suggestion that the polar ionosphere may not rotate with the earth. The depth to which the effects of the interplanetary drag might penetrate is examined here with the aid of two simple models.
openaire +1 more source
Electromagnetic resonances in the polar ionosphere
Space Science Reviews, 1980The utilization of resonant oscillations for ionospheric modification experiments and ionospheric diagnosis, based on plasma physics and non-linear electrodynamics, is discussed. The spectra of resonant oscillations of natural and artificial origin in the polar ionosphere and the excitation of these oscillations and their development are analysed.
openaire +1 more source
Horizontal gradients in the polar ionosphere
Journal of Geophysical Research, 1969Polar Ionosphere Beacon Satellite S-66 signals measured for large scale horizontal gradients in total electron content of Antarctic ionosphere at sunspot minimum and ...
openaire +1 more source
HF-driven currents in the polar ionosphere
2011 XXXth URSI General Assembly and Scientific Symposium, 2011Ionospheric 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 +4 more
openaire +1 more source
Light ion velocities in the polar ionosphere
Journal of Geophysical Research: Space Physics, 1981High‐speed flow of light ions along magnetic field lines is not simply a consequence of those field lines having an open topology. Here we point out that the magnitude of the H+ flow velocity in the polar wind is not predicted by theoretical models but rather it is imposed as a boundary condition.
J. A. Murphy, R. A. Heelis
openaire +1 more source
Ionospheric Measurements in the Polar Regions
Nature, 1934THIS 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 ...
openaire +1 more source
POLARIZATION OF IONOSPHERICALLY PROPAGATED WAVES
1967Abstract : The theory of wave propagation in the ionosphere, supported by experimental measurements, is used to demonstrate that regular amplitude variations in HF sweep-frequency oblique-ionogram one-hop rays - when linearly polarized receiving antennas are employed - are due to corresponding variations of the received wave polarization with radio ...
openaire +1 more source
Field-aligned Currents in the Undisturbed Polar Ionosphere
pure and applied geophysics, 1989Field-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 ...
openaire +1 more source
Constitution of the Ionosphere and the Lorentz Polarization Correction
Nature, 1938SOME years ago considerable discussion took place concerning the relation between the constitution of the ionosphere and its refractive index for radio waves. The question at issue was whether the force per unit charge exerted by the electric field of a radio wave upon an elementary charged particle in the ionosphere should be taken simply as the ...
H. G. BOOKER, L. V. BERKNER
openaire +1 more source