Results 121 to 130 of about 711 (146)

Digitizing the conventional ionosonde

Radio Science, 1979
This paper discusses the accuracy limitations of the conventional ionosonde and techniques which may be used to improve it and at the same time reduce analysis effort. Add‐on digital equipment is described which may easily be attached to any ionosonde to improve its performance at a low cost.
openaire   +1 more source

Ionosonde observations of pulsating auroras

Canadian Journal of Physics, 1981
An "Australian" type ionosonde with modifications to record virtual height versus time in addition to regular ionograms was used for 23 nights during the "pulsating aurora campaign". Height variations associated with pulsating auroras were noted on 14 nights.
J. W. MacDougall, J. A. Koehler, J. Hofstee, D. J. McEwen   +3 more
openaire   +1 more source

Legendre coding for digital ionosondes

Radio Science, 2005
A 1019 bit Legendre code was evaluated for use in digital ionosondes. Experimental testing was done using the Canadian Advanced Digital Ionosonde (CADI). Theoretically, the 1019 Legendre code autocorrelation function of this new sequence has very low peak sidelobe level of −32.6 dB, and the system signal‐to‐noise‐ratio (SNR) will be improved by 30 dB ...
J. Huang, J. W. MacDougall
openaire   +1 more source

Ionosonde antenna system for combined ionospheric sounding

Antennas, 2023
The article is devoted to new and promising directions of development of ionosonde antenna systems, which have appeared in recent years and are able to conduct vertical and oblique sounding of ionosphere. A brief historical overview of ionosphere research has been given.
D. S. Korlyakov, S. V. Litvinov
openaire   +1 more source

Virtual ionosonde network in conjugate hemisphere

2011 XXXth URSI General Assembly and Scientific Symposium, 2011
The global ionosonde network distribution is uneven concentrated on land with gaps over the oceans. Figure 1 demonstrates percentage latitudinal distribution of the critical frequency foF2 provided by global ionosonde network with data volume dominating in Zone 1 (50 to 60°N) and Zone 2 (35 to 45°N) of the Northern hemisphere.
T. L. Gulyaeva, F. Arikan, I. Stanislawska   +2 more
openaire   +1 more source

Active mode radiosounding on ionosonde "TOMION"

SPIE Proceedings, 2016
The article is a brief description of the software developed for operation ionosonde "TOMION" in an accelerated mode active vertical radiosounding of the ionosphere.
R. K. Khaitov, A. A. Mitaev, S. A. Kolesnik, I. V. Romanov, M. V. Pikalov, E. S. Kolesnik   +5 more
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Autoscala: an aid for different ionosondes

Acta Geophysica, 2009
Autoscala is a software to automatically scale ionospheric characteristics from an ionogram. Initially it was only applied to the ionograms recorded by the AIS-INGV ionosondes installed at Rome and Gibilmanna (Italy), and Tucuman (Argentina), that are not able to record the polarization of the received echo.
Michael Pezzopane, Carlo Scotto, Łukasz Tomasik, Igor Krasheninnikov   +3 more
openaire   +1 more source

First bistatic oblique‐incidence ionograms between digital ionosondes

Radio Science, 1983
Identical digital ionosondes (dynasondes) at Brighton Colorado and at White Sands Missile Range, New Mexico, 864 km distant, were synchronized for bistatic sounding in multifrequency and fixed frequency recording patterns. Three propagation modes are observed, identified, and reconciled with standard propagation theory; these include one‐hop ...
Wright, J.W., Kressman, R.I.
openaire   +2 more sources

Satellite Ionosonde Records: Resonances Below the Cyclotron Frequency

Science, 1968
Resonant responses observed by the topside ionosonde in the Canadian satellite Alouette II are examined. In addition to the well-known plasma resonances, several subsidiary resonances are identified below the electron cyclotron frequency. Their patterns of occurrence are not consistent with a suggested explanation of induced magnetic dipole radiation ...
R E, Barrington, T R, Hartz
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Vertical Sounders — the Ionosonde

1991
One of the first measurements of ionospheric layer height was reported by Appleton and Barnett in 1926, who used a continuous wave transmitter and a receiver located from 65 to 130 km distant from the transmitter. The ground wave and the skywave arrived at the receiver with a relative phase difference.
openaire   +1 more source