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