Resonant scattering of radio waves in the high-latitude lower ionosphere

A resonant-scattering investigation was carried out in the nighttime high-latitude lower ionosphere during February-March 1978 in the Monchegorsk region. Ionospheric plasma was artificially disturbed by a transmitter continuously emitting linear polarized radio waves at a frequency of 3.3 MHz and an effective power of about 10 MW. Two standing waves were produced in the ionosphere as a result of magnetoionic splitting. A mobile station with the following parameters was used for the diagnostics: a frequency range of 1.7-3.5 MHz, a pulse duration of 25 microsec, and an effective pulse power of 9 MW. Resonant-scattering measurements of electron density profiles N(z) were compared with data obtained with the partial-reflection and vertical-sounding techniques.