Results 211 to 220 of about 197,251 (258)

Equion, an Equatorial Ionospheric Irregularity Experiment

Journal of Geophysical Research, 1977
Abstract : This paper describes a coordinated rocket and ground based study to investigate Equatorial Spread-F irregularities. Measurements by the Jicamarca backscatter radar, ionosondes, airglow instrumentation and of radio scintillations were correlated with high spatial resolution measurements of electron densities, particle fluxes and VLF-ELF ...
F. A. Morse, B. C. Edgar, H. C. Koons, C. J. Rice, W. J. Heikkila, J. H. Hoffman, B. A. Tinsley, J. D. Winningham, A. B. Christensen, R. F. Woodman, J. Pomalaza, N. R. Teixeira   +11 more
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Topside irregularities in the equatorial ionosphere

Journal of Atmospheric and Terrestrial Physics, 1977
Abstract This paper is a brief review of ionospheric irregularities in the equatorial topside ionosphere. Results from topside sounders, direct measurement satellites, and the Jicamarca incoherent scatter radar are discussed. Scintillation observations and theories of irregularities are not discussed in detail as these are the subject of other review
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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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Diffraction Radio Tomography of Ionospheric Irregularities

2003
In forward scattering, the definition of the linear integrals q z (ρ, ω) (3.21) from the complex potential q(r,ω) reduces the ISP to the problem of tomographic reconstruction, i.e., the problem of reconstructing an object from its projections. Achievements in X-ray tomography in recent decades have been responsible for the intense development of ...
Viacheslav E. Kunitsyn, Evgeny D. Tereshchenko   +1 more
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Irregular regions in the Antarctic ionosphere

Journal of Geophysical Research, 1969
Irregular regions in Antarctic ionosphere from Polar Ionosphere Beacon Satellite S-66 recordings, obtaining irregularities density from nulls ...
J. E. Titheridge, G. F. Stuart
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Ionospheric drifts and E-region irregularities

Planetary and Space Science, 1963
Abstract A physical interpretation is attempted of the components of electrodynamic drift of ionization in a lightly ionized gas. Only one component, representing the flux of “neutral ionization” appears capable of leading to the formation of irregularities in the electron density.
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Multi-scale ionospheric irregularities occurrence over South America during the St. Patrick's day storm on March 17, 2015

Journal of Atmospheric and Solar-Terrestrial Physics, 2018
During the solar cycle 24 there was a very intense geomagnetic storm due to the St. Patrick's day storm and the effects of this storm on ionosphere has become a topic of extensive space weather investigation. Up to now several aspects of the St.
F. Barbosa, P. Fagundes, K. Venkatesh, B. Fejer, V. Pillat, C. Denardini, M. Muella   +6 more
semanticscholar   +1 more source

Reflexions from irregularities in the ionosphere

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1953
As part of the investigation of travelling disturbances in the ionosphere during four years, a close study has been made of small daytime changes in the virtual height of F -region reflexions with periods of 10 min to 1 h. In some cases, complex reflexions are observed. It is shown that although three distinct types
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Upward moving ionospheric irregularities over kodaikanal

Proceedings of the Indian Academy of Sciences - Section A, 1971
The occurrence of upward moving kinks first found on ionograms at Thumba (Rastogi, 1970) has been confirmed to occur at another equatorial station, Kodaikanal. These kinks have been found in many records and they occur mostly during local summer months.
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Ionospheric Irregularities caused by Acoustic Waves

Nature, 1967
THIS communication presents some observational evidence for ionospheric irregularities being formed because of the propagation of acoustic waves. The acoustic waves themselves are believed to have been associated with an earthquake experienced at College, Alaska.
D. B. RAI, J. L. KISABETH
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