Î SGO Ionospheric Tomography Description
Oulun yliopisto

Ionospheric Tomography


Description: A chain of five 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.  

Method (pdf)

Some references

Nygren, T., M. Markkanen, M. Lehtinen, E. D. Tereshchenko, B. Z. Khudukon, Stochastic inversion in ionospheric radiotomography, Radio Science, 32, 2359-2372, 1997.
Norberg, J., Roininen, L., Kero, A., Raita, T., Ulich, T., Markkanen, M., Juusola, L., and Kauristie, K.: Sodankylä¤ ionospheric tomography dataset 2003-2014, Geosci. Instrum. Method. Data Syst. Discuss., 5, 385-404,
doi:10.5194/gid-5-385-2015, 2015.


Russian LEO satellites called as Tsykada. Codes presented on the main page response planes of the satellites. Here are details of the active satellites:

Code Plane USSPACECOM code Int. code Satellite
101 1 28380 2004-028-A COSMOS 2407
102 2 27818 2003-023-A COSMOS 2398
103 3 35635 2009-039-A COSMOS 2454
104 4 28521 2005-002-A COSMOS 2414
105 5 32052
(COSMOS 2361)
106 6

(COSMOS 2378)

Operation of the chain: Continuous operation started on January 1, 2003. Satellite schedules updated weekly, reconstruction calculated monthly. Raw data can be stored by request. Amplitude and phase differecence updated once per hour to LatestData page.

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):TEMPORARILY CLOSED
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):TEMPORARILY CLOSED
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 

L-value of stations checked from VITMO ModelWeb (IGRF-11, 2010, altitude 100km).

Last modified: 17 June 2016, 12:06:25.