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Ionosondes: Reversed Independent Variables●●●●With most ionosphere sensors, the observationlocation is selected by the instrument●●Radar look directionSatellite orbitThe plasma density is measured●●●Radar ReflectivityLocal Plasma probeTEC along a known pathWith an ionosonde, the plasma density is set bythe frequency of observation.The measurement is the location (range, direction)of the ionosphere which has that density.