Results 151 to 160 of about 425 (190)

Evidence of Directional Filtering of Travelling Ionospheric Disturbances

Nature Physical Science, 1972
IT has recently been pointed out1 that the strong thermospheric winds would act as a directional filter. In a windy thermosphere an otherwise penetrating gravity wave may become reflected or asymptotically trapped near the lower thermosphere. Because both reflexion and trapping take place below the ionospheric F2 peak, such waves may not excite ...
K. C. YEH, H. D. WEBB, D. H. COWLING
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Travelling disturbances associated with ionospheric storms

Journal of Atmospheric and Terrestrial Physics, 1965
Following each of three geomagnetic sudden commencements, ionospheric disturbances (ionospheric storms) are found to propagate from two isolated locations in high-latitude regions of the Earth. These two positions are conjugate points (magnetically), and are in different locations for each magnetic storm.
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GPS radio interferometry of travelling ionospheric disturbances

Journal of Atmospheric and Solar-Terrestrial Physics, 1998
Abstract This paper presents some results investigating the new possibilities of radio interferometry of Travelling Ionospheric Disturbances (TIDs) that are based on exploiting standard measurements of transionospheric radio signal characteristics and coordinate-time measurements using dual-frequency multichannel receivers of the Global Positioning ...
E.L. Afraimovich, K.S. Palamartchouk, N.P. Perevalova   +2 more
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Three-dimensional observations of traveling ionospheric disturbances

Journal of Atmospheric and Terrestrial Physics, 1971
Abstract Twenty-five measurements of vertical and horizontal trace velocities of medium size traveling ionospheric disturbances were made near sunset at Boulder, Colorado from June 1967 through June 1968. The total speeds of the TID's were slightly larger in summer than in winter with a mean value of 143 m/s.
Kenneth Davies, John E. Jones
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Traveling ionospheric disturbances associated with nuclear detonations

Journal of Geophysical Research, 1967
The analysis of ionospheric data taken from 54 ionosonde observatories throughout the world indicates the presence of several traveling ionospheric disturbances originating from the five high-altitude nuclear tests conducted over Johnston Island in 1962.
W. J. Breitling, R. A. Kupferman, G. J. Gassmann   +2 more
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Traveling Ionospheric Disturbance Mitigation for OTH Radar

2007 IEEE Radar Conference, 2007
Deflection of HF propagation paths by traveling ionospheric disturbances (TIDs) remains a troubling cause of coordinate registration errors for over-the-horizon (OTH) radar. Bandwidth and coverage limitations in ionospheric soundings preclude the ability to model TID structure in real time in most cases.
L. J. Nickisch, Mark A. Hausman, Sergey Fridman   +2 more
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Traveling ionospheric disturbances observed at the magnetic equator

Journal of Geophysical Research, 1971
Traveling ionospheric disturbances at magnetic equator, determining electron concentration profiles by incoherent scatter ...
D. L. Sterling, W. H. Hooke, R. Cohen
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Topside Ionospheric Response to Large‐Scale Traveling Ionospheric Disturbances

Journal of Geophysical Research: Space Physics
Abstract Understanding the formation, progression, and global impact of Large Scale (LS) Traveling Ionospheric Disturbances (TIDs) is a long‐standing challenge in global space weather research. At high latitudes, the magnetosphere injects significant energy into the Ionosphere‐Thermosphere (I‐T) system through Joule heating, auroral ...
A. G. Burrell, K. Zawdie, M. Burleigh, M. Dhadly, F. Sassi, A. Coster   +5 more
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An unusual travelling disturbance in the F-region of the ionosphere

Journal of Atmospheric and Terrestrial Physics, 1965
Abstract A series of ionograms showing satellite traces has been interpreted in terms of a large in verted-trough disturbance travelling in the F-region overhead. Some details of the shape of the disturbance, which resembled a breaking wave in cross-section, have been worked out.
D.C. Baker, J.A. Gledhill
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Incoherent scatter observations of traveling ionospheric disturbances

Journal of Geophysical Research, 1964
The incoherent scatter technique is used to study large-scale traveling ionospheric disturbances above Puerto Rico. Below the F-region maximum the measurements of disturbance amplitude, period, and direction of phase progression with time (downward) are consistent with the bottomside results of other workers. Above the maximum, however, the surfaces of
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