Physics
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984rael...29.1274e&link_type=abstract
Radiotekhnika i Elektronika (ISSN 0033-8494), vol. 29, July 1984, p. 1274-1279. In Russian.
Physics
2
Radio Transmission, Solar Corona, Solar Cycles, Wave Propagation, Electron Density (Concentration), Monochromatic Radiation, Propagation Modes, Space Probes, Sunspots
Scientific paper
Variations of the propagation conditions of monochromatic radio waves through the solar corona during an 11-year cycle are analyzed on the basis of space-probe (Pioneer, Mariner, Mars, Venera, Helios, Viking, and Voyager) data. It is shown that, besides short-term variations of radio-signal parameters with a characteristic time of 5-20 days, there occur long-term variations of propagation conditions with periods of several years. These latter variations are due to variations of plasma flux density on the propagation path. Irregularities of the refractive index increase with increasing electron density, which leads to an increase in radio-wave scattering and therefore to an increase in fluctuations of amplitude, phase, and spectral-line broadening.
Efimov Alexander I.
Iakovlev O. I.
Rogalskii V. I.
Shtrykov V. K.
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