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The Dynasonde at Tromsø
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Description of the dynasonde
The Dynasonde is a digital HF sounder (see picture)
covering ca. 1-30 MHz. It is sometimes refered to as a frequency agile
sounder, or Advanced Ionospheric Sounder, hence the acronym FAIS
for the software which is used to run it. It can be run like an ionosonde
or in other modes such as fixed frequency soundings, even like a partial
reflection sounder. Up to 6 Long fat dipoles are used as spaced receiving
antennas. They do break sometimes through weight of snow and metal fatigue
as they vibrate in the wind. Each half dipole
is made from an 11 m long, 15 cm diameter aluminium tube suspended about 2m above the ground.
A sample
ionogram may be found. The latest and previous soundings are also available. There are other
Dynasondes at Halley Bay in the Antarctic, at Bear Lake in Utah, USA, and at Lycksele, Sweden.
Related Site:
The Dynasonde is used in special ways together with the Heating facility at times. This makes it a powerful HF radar as some of our recent API results show.
Another variant is to use a fixed frequency for so-called IDI (Imaging Doppler Interferometry). How to use the Dynasonde Tips on starting and running the sounder exist.
Related Site:
World Days 2013
