Sodankylä Geophysical Observatory
Ionospheric tomography

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Description: A chain of four satellite receivers observes signals from the Russian Low Earth Orbit (LEO) satellites. Two signals transmitted coherently at frequencies 150 MHz and 400 MHz are received and their phase difference is used to calculate the ionospheric electron density by means of statistical inversion. The results are shown in terms of electron density plots in a vertical plane above the receiver chain. In an ideal case the satellite flies along the chain. If this is not the case, the plot is a projection from regions outside the vertical plane. In order to estimate the validity of the results, check the satellite path in each case.  

Operation status of the station:
Continuous operation started at TRO, KIR, LUL and KOK on January 1, 2003.
Tromsø station closed 15th of Nov 2003.
Tromsø station operated during Finnish EISCAT campaign (17.2.-25.2. 2004).
Kilpisjärvi (NUR) station installed 16th of February 2004. Nurmijärvi (NUR) station installed 1st of June 2004.

Receiver sites and the hosts:

Tromsø (TRO: 69.66°N, 18.94°E, L=6.5): CLOSED
The Auroral Observatory
, University of Tromsø, Norway

Kilpisjärvi (KIL: 69.02°N, 20.86°E, L=6.1):
SGO's site station, Kilpisjärvi, Finland

Kiruna (KIR: 67.84°N, 20.41°E, L=5.6):
Swedish Institute of Space Physics (IRF)
, Kiruna, Sweden

Luleå (LUL: 65.58° N, 22.17°E, L=4.7):
Luleå University of Technology
, Luleå, Sweden

Kokkola (KOK: 63.83°N, 23.06°E, L=4.2):
Keski-Pohjanmaan Ammattikorkeakoulu, Tekniikan yksikkö
, Kokkola, Finland 

Nurmijärvi (NUR: 60.51°N, 24.65°E, L=3.4):
Finnish Meteorological Institute, Nurmijärvi Geophysical Observatory
, Nurmijärvi, Finland 



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Last updated: 16 August 2004, 1157 UT (TJR)