The Sodankylä Ionosonde started regular, half-hourly vertical soundings of the ionosphere on 1st August 1957. The observatory's second sounder (IS-14) was taken into operation on 1st February 1977. This sounder was modified later on. A new era of ionospheric vertical soundings began on 16th November 2005 when the new "Alpha Wolf" ionosonde was taken into use, which was built from scratch as a research ionosonde by the observatory during the previous three years. The new instrument performed soundings every 10 min until early April 2007, when 1-min soundings for the IPY began.
For technical details of the ionosondes used in SGO, see Instrument Descriptions.
For terminology used see:
URSI Handbook of Ionogram Interpretation and Reduction, second Edition, November 1972 by W.R. Piggott and K. Rawer, WDC A, Report UAG-23. April 1993.
We have a list of qualifying and descriptive letters available.
Observer in charge:
- Dr. Thomas Ulich
- Head of the Ionospheric Station
- Sodankylä Geophysical Observatory
- Tähteläntie 62
- FIN-99600 Sodankylä, Finland
- Phone: +358-(0)16-619811
- Fax: +358-(0)16-619875
- e-mail: to Thomas Ulich
Last updated: 26/10/2016