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- 2 метод частичных отражений
- 2 метод часткових відбиттів
- 1 electron collision frequency
- 1 natural disturbances
- 1 natural sources of ionospheric di...
- 1 radio sounding of the lower ionos...
- 1 recording the amplitudes of refle...
- 1 the electron density
- 1 the high-latitude D region of the...
- 1 the middle latitude ionospheric D...
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