| 21. | Afterwards, it had served as a summer base for ionospheric and meteorologic research.
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| 22. | Both have been and are regularly determined from Ionograms at all Ionospheric sounding stations.
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| 23. | The group's research laid the groundwork for ionospheric space-weather studies.
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| 24. | Ionospheric resistance has a complex nature, and leads to a secondary Hall current flow.
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| 25. | Ionospheric soundings were performed aboard this ship.
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| 26. | Reflection occurs at the ionospheric F layers.
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| 27. | All types of wire ( line ), satellite and ionospheric radio communication are employed.
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| 28. | Here the equipment would be openly operated in the guise of an ionospheric monitoring station.
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| 29. | He served as the Director of the resultant Arecibo Ionospheric Observatory from 1960 to 1965.
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| 30. | A radar beam scattering off electrons in the ionospheric plasma creates an incoherent scatter return.
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