Results 191 to 200 of about 336,044 (232)

The dispersion of traveling ionospheric disturbances

Journal of Geophysical Research: Space Physics, 1983
The horizontal dispersion of relatively large daytime TID events seen by the Dartmouth rapid‐run ionosonde network is found to conform, at least qualitatively, to that predicted by previous theoretical treatments of freely propagating gravity waves in the presence of dissipation.
M. G. Morgan, B. L. Tedd
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Epicenter from Ionospheric Disturbances

2019
Epicenter is one of the core parameters in seismology. Accurate and rapid determination of the epicenter has important guidance significance for evaluation and rescue of the earthquake destruction. Meanwhile, the epicenter parameter is also the fundamental for the study of earthquake precursory, evolution process, and long-term material migration.
Shuanggen Jin, R. Jin, X. Liu
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Detection Methods for Ionospheric Disturbances

2019
Due to the complex spatial distribution and variation of the ionospheric layer, it is difficult to separate or remove each anomaly. The ionosphere has regular variations (daily and seasonal scales) and anomalies due to the magnetic storm, solar flares, and scintillation as well as other hazard events.
Shuanggen Jin, R. Jin, X. Liu
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Lightning spectrometer for ionospheric disturbances

2011 IEEE International Symposium on Antennas and Propagation (APSURSI), 2011
Lightning acts as an electric dipole antenna emitting radio waves that affect the ionosphere. This property is the basis for a new low-cost ground/satellite observation capability to measure dispersion and total electron content in the ionosphere. These properties are important to RF propagation in general and affect the accuracy of GPS.
Rosemary Burns, Zach Chacon, William DeRaad, Anastasia Ierides, Matthew McCullough, Mario Ortega, Steve Suddarth   +6 more
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Doppler observations of ionospheric disturbances

Contemporary Physics, 1970
Summary The Doppler shift in frequency of an ionospherically reflected radio wave can be used to study various ionospheric disturbances. In this article the experimental arrangement for measuring such a shift is described, and examples of frequency shifts associated with solar flares, geomagnetic variations and travelling disturbances are discussed.
P. A. Atkinson, S. J. Edwards
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Wave-like Disturbances in the Ionosphere

Nature, 1973
BEER1 has recently suggested that atmospheric gravity waves could be expected to exist in the ionosphere as a result of the supersonic motion of the terminator. He reached this conclusion by drawing an analogy between the proposed production of gravity waves by the supersonic motion of the Moon's shadow on the Earth's atmosphere during a solar eclipse2,
W. J. RAITT, D. H. CLARK
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A study of sudden disturbances of the ionosphere

Eos, Transactions American Geophysical Union, 1937
Research is proceeding on a wide front in the cosmic sciences on a phenomenon which was unknown two years ago. The phenomenon is a sudden and short‐lived increase of ionization of a part of the ionosphere, manifesting itself by perturbations in radio transmission, terrestrial magnetism, and earth‐currents.Whenever the phenomenon occurs, it is most ...
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Observations of Sudden Ionospheric Disturbances

Proceedings of the Physical Society, 1960
Observations were made of the effect of sudden ionospheric disturbances on radio waves reflected from, and transmitted through, the ionosphere. The results of simultaneous measurements of the phase changes on waves of frequency 2-6 Mc/s are shown to indicate that they are due to an increase in the electron density which extends to above the maximum of ...
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Ionospheric Interaction in Disturbed Conditions

Proceedings of the Physical Society. Section B, 1951
Measurements of ionospheric interaction depend on special radio transmissions which are only available on a limited number of occasions, and only on some of these occasions are ionospheric conditions steady enough for direct comparison between experiment and theory.
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The ionospheric disturbance and atmospheric waves

Journal of Atmospheric and Terrestrial Physics, 1966
This paper describes in outline how disturbances in the auroral regions can give rise to atmospheric winds which then affect the F-region at middle latitudes. Later papers in the series will elaborate and substantiate points raised here. Atmospheric waves generated by non-uniform heating in auroral activity travel through the F-region.
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