UASD Instrument Overview: DYNASONDE
Dynasonde, Principles of Operation

The dynasonde sounds the ionosphere using radio waves to provide information on the vertical and horizontal distribution of ionisation. The sounder transmits a series of radio pulses skywards at successively higher frequencies. Each pulse is reflected from a different altitude between about 60km and 500km depending on the electron concentration. The echoes are received by an array of antennas on the ground and the time delay between transmission and reception gives a measure of the distance to the reflection point. The radio wave phase differences between antennas allow the horizontal distance and line-of-sight velocity of each echoing region to be estimated. These parameters allow the location and dynamics of large-scale ionospheric features to be studied.

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