You searched for: “ionosonde
ionosonde
1. The traditional technique for measuring the properties of the ionosphere by transmission and reception of vertically incident radio pulses at swept frequencies in the high frequency range.
2. A pulsed radar device used to measure the height of ionospheric layers.
3. A radar system for determining the vertical height at which the ionosphere reflects signals back to earth at various frequencies.

A pulsed vertical beam is swept periodically through a frequency range from 0.5 to 20 megahertz, and the variation of echo return time with frequency is photographically recorded.

This entry is located in the following unit: ion, ion- + (page 8)