Results 131 to 140 of about 711 (146)

From ionosonde to rocket sonde

Journal of Geophysical Research: Space Physics, 1994
The 75th Anniversary of the AGU marks the discovery of the basic features of solar control of the ionosphere. A quarter of a century later our understanding of ionospheric physics was revolutionized by the early rocket era of upper air research that brought the discoveries of solar X ray and XUV radiation.
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Ionosonde networking, databasing, and Web serving

Radio Science, 2006
A comprehensive set of technical solutions has been developed for the distributed network of digisonde ionospheric sounders to make their data available in a timely and user‐friendly fashion. In a significant engineering effort, 34 digisondes operating worldwide stand as a modern sensor network with on‐site intelligent data interpretation, data ...
I. A. Galkin, G. M. Khmyrov, A. Kozlov, B. W. Reinisch, X. Huang, D. F. Kitrosser   +5 more
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Using the Swedish Ionosonde Network

Sixth International Conference on `HF Radio Systems and Techniques', 1994
The three vertical ionosondes operated by the Swedish Institute of Space Physics have been modernized and integrated with a data network. They are collectively called SIN, the Swedish Ionosonde Network. The authors describe a graphical user interface for running and displaying results from the ionosondes.
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Simulation of ionosonde observations of ionospheric holes

Journal of Atmospheric and Terrestrial Physics, 1992
Abstract When conducting active experiments in the ionosphere which give rise to artificial disturbances of electron density, it is necessary to diagnose such disturbances. The study of irregularities using groundbased radio sounding methods often involves recording and analyzing ionogram traces, depending on the position, dynamics and phase of ...
A.D. Kalikhman, N.N. Klimov, G.K. Matafonov, A.V. Tashchilin   +3 more
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Improving Signal-to-Noise Ratio in Oblique Ionosonde Soundings Using New Hardware Capability of the DPS4D Ionosonde

2018 2nd URSI Atlantic Radio Science Meeting (AT-RASC), 2018
Travelling Ionospheric Disturbances (TIDs) are ionospheric signatures of atmospheric gravity waves. They can result from a variety of natural or artificial sources. Their identification and tracking is important because the TIDs affect all services that rely on predictable ionospheric radio wave propagation.
Tobias G.W. Verhulst, David Altadill, Ivan Galkin, Estefania Blanch, Stanimir M. Stankov, Bodo W. Reinisch, Alexander V. Kozlov, Anna Belehaki   +7 more
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A Low-Power Vertical-Incidence Ionosonde

IEEE Transactions on Geoscience Electronics, 1971
Vertical-incidence (VI) ionospheric measurements, traditionally performed with 5- to 50-kW ionosondes, may be obtained alternatively using FM CW transmissions of much lower peak power. The FM signal must be interrupted periodically to permit both transmitting and receiving with a single antenna.
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Quantifying spread F by digital ionosondes

Advances in Space Research, 2003
The width of frequency-spreading (Δff) on ionograms was shown (Wright, et al., 1977, by comparison with OGO-6 Satellite observations) to be proportional to ΔNN near and above the F-region peak. Thus, even classical analog ionograms using logarithmic frequency scales were direct reading for this important parameter, although little use has been made of ...
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Preliminary observations with a directional ionosonde

Planetary and Space Science, 1971
The addition of three spaced aerials and minor instrumentation to a conventional ionosonde permits the measurement of the angle-of-arrival of ionospheric reflections. Such a directional ionosonde (which is essentially a swept-frequency interferometer) is described, together with a derivation of the formulae relating the angles-of-arrival to the ...
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A dynamic ionosonde design using pulse coding

Canadian Journal of Physics, 1991
A research ionosonde with capabilities for measuring drifts by the spaced-antenna method was designed and a limited prototype tested. Using a PC for much of the control and data storage functions and a small quantity of external electronics will make the instrument small and inexpensive.
S. Gao, J. W. MacDougall
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Es-layer characteristics determined from spaced ionosondes

Planetary and Space Science, 1970
An analysis was made of ionograms recorded for approximately 1900 hr during 12 months with an average of six ionosonde receivers distributed over an area of some 700 km2. The Es-layer characteristics (measured by f{hook}Es, and f{hook}bEs) remained essentially constant for onethird of the time during which Es, was recorded.
Goodwin G.L., Summers R.N.
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