The Physics & Astronomy Department of the Univsersity
of Canterbury operate an ionosonde at both Eyrewell (about 30km northwest of
An ionosonde is a swept frequency vertical sounding radar. The time delay of the echoes from the ionosphere give information on the electron density in the ionosphere. The ionogram (picture produced by an ionosonde) displays the time to receipt of an echo on the vertical axis against frequency on the horizontal axis. Ionograms are recorded every 5 minutes. Click here to view the latest hourly ionogram recorded at Eyrewell.
Ionosondes are operated at several locations by IPS in Australia. IPS, a unit of the Australian Government Department of Administrative services provides the Australian radio propagation and space environment services. Current and recent ionograms for all automated sites may be viewed using the Java applet provided on the IPS site. Data archives on film dating from the earliest ionosonde in 1938 until the early 1990’s are held at the New Zealand Film Archives unit.
The Eyrewell ionosonde
is maintained under a New Zealand Defence Force contract to the Department of
Physics and Astronomy of the
For more information contact Graeme Plank