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- 2 ionospheric disturbances
- 2 method of partial reflections
- 2 method the partial reflection
- 2 precipitation of charged particles
- 2 radio sounding of the lower ionos...
- 2 recording the amplitudes of refle...
- 2 the earthquake
- 2 the lower ionosphere parameters
- 2 the noise characteristics
- 2 висипання заряджених частинок
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