Results 171 to 180 of about 2,679 (211)

Ionospheric scintillation observations from SHAR

Journal of Atmospheric and Terrestrial Physics, 1992
Abstract VHF intensity scintillations associated with equatorial spread-F were recorded at SHAR (dip 13°N), India, using the 136.1 MHz beacon from the geostationary satellite ETS-2. The observations were made during the periods 12 March–26 April 1986 and later from 15 September to 5 October 1988.
H. Chandra, G.D. Vyas, H.S.S. Sinha, R.N. Misra, S. Prakash   +4 more
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Ionospheric scintillation observations at Natal

Journal of Geophysical Research: Space Physics, 1981
We report ionospheric scintillation observations made at Natal, Brazil, during a period of 2½ years. The nighttime scintillations of satellite signals at 250 MHz commonly exceeded 20 dB peak‐to‐peak. Seasonally, it showed a typical behavior for the South American sector with a single peak centered around October–November months and the local evening ...
K. C. Yeh, J. P. Mullen, J. R. Medeiros, R. F. da Silva, R. T. Medeiros   +4 more
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Ionospheric scintillations at lunping

Journal of the Chinese Institute of Engineers, 1978
Abstract The ionospheric scintillation data obtained at Limping Observatory from January to June, 1976, were used to study the scintillation activity at the crest zone of the so‐called equatorial anomaly of foF2. Unusually large scintillation activity was found. Seasonally, the activity was largest in summer and smallest in winter.
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Spectra of ionospheric scintillation

Journal of Geophysical Research, 1976
Observations of amplitude and phase scintillation were made at the Millstone Hill radar facility by using phase coherent sources at 150 and 400 MHz on the U.S. Navy navigation system satellites. These observations have been processed to yield power spectra of the fluctuations in the logarithm of the received power (log power) at each frequency and the ...
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Multifrequency studies of ionospheric scintillations

Radio Science, 1977
Simultaneous scintillation data from the ATS‐6 Radio Beacon Experiments for signals at 40, 140, and 360 MHz offer the opportunity to study the frequency dependence of the scintillation phenomenon. Using these data variations of the spectral index, correlation coefficient, and the correlation interval are investigated.
R. Umeki, C. H. Liu, K. C. Yeh
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Algorithm of Ionospheric Scintillation Monitoring

2018 7th International Conference on Digital Home (ICDH), 2018
With the development of the Beidou satellite navigation system, the monitoring of ionospheric scintillation combined with GPS and Beidou system has become a trend. In this paper, the design and implementation of the upper computer software for ionospheric scintillation monitoring are introduced, and the related algorithms such as ionospheric amplitude ...
Xiyan Sun, Zheyang Zhang, Yuanfa Ji, Suqing Yan, Wentao Fu, Qidong Chen   +5 more
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Ionospheric irregularities and radio scintillations

Contemporary Physics, 1975
(1975). Ionospheric irregularities and radio scintillations. Contemporary Physics: Vol. 16, No. 5, pp. 469-488.
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Power spectra of ionospheric scintillations

Journal of Atmospheric and Terrestrial Physics, 1974
Abstract The diffraction theory of interplanetary scintillations, which allows a connection to be established between the spatial spectrum of electron-density fluctuations in the irregular medium and the power spectrum of intensity scintillations observed on the ground, is reviewed and applied to the case of the ionosphere.
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Quasiperiodic scintillation in the ionosphere

Journal of Atmospheric and Terrestrial Physics, 1972
Abstract The hypothesis is advanced that a regular cyclic type of fading seen occasionally on chart recordings of HF and VHF radio frequency signals that have penetrated the ionosphere is a special case of the more normal irregular ionospheric scintillation.
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Ionospheric Scintillations: Indices and Modeling

Radio Science, 2019
AbstractThis paper presents a review of the ionosphere scintillation characteristics recorded at low and high latitudes. The European Space Agency (ESA) MONITOR database has been used to support the analysis. We review in particular the different indices and the values recorded by the different kinds of receivers deployed during the measurement ...
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