Abstract
THE ionosphere presents a nearly impenetrable barrier for ground-based decametric (3–30 MHz) radioastronomical observations, though a few valiant efforts have been made under special conditions to reach frequencies near 1 MHz (ref. 1).
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References
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PAPAGIANNIS, M., MENDILLO, M. Low frequency radio astronomy through an artificially created ionospheric window. Nature 255, 42–44 (1975). https://doi.org/10.1038/255042a0
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DOI: https://doi.org/10.1038/255042a0
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