Ionospheric radio wave absorption in the auroral zone and the interplanetary magnetic field sector structure

Physics

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Auroral Zones, Electromagnetic Absorption, Interplanetary Magnetic Fields, Ionospheric Propagation, Radio Attenuation, Abnormalities, Polarization Characteristics, Solar Activity Effects, Time Dependence

Scientific paper

This paper considers the character of radio-wave absorption variations in the auroral zone, depending on the relative number of sunspots over an 11-yr cycle and on interplanetary magnetic field (IMF) sector polarity, by using observations carried out at Murmansk by the A1 method at noon throughout 1959 to 1967. It is shown that the abnormal-absorption occurrence frequencies as well as the background absorption values are generally larger in the case of the IMF directed away from the sun. The difference, caused by IMF sector polarity, of both values is subject to regular quasi-two-year variations.

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