University of Oulu

Space Research Group of OuluSatellite radio tomography in Oulu

spaceweb@oulu.fi - last update: 1 April 2010 (RR)

The Space Physics Group of Oulu has carried out satellite radio tomography measurements with the Sodankylä Geophysical Observatory (Finland) and Polar Geophysical Institute (Murmansk, Russia) to study the Earth's ionosphere. The instrumentation consists of a chain of satellite receivers developed by the Polar Geophysical Institute. The chain is positioned along, e.g., magnetic meridional plane. During the operation, the receivers will observe phase difference of two coherent waves from polar orbiting Russian navigational satellites. Tomographic inversion of the data produces plots of F-region electron densities. A new sophisticated analysis package has been developed, which calculates the electron density by means of stochastic inversion.

Radiotomography related publications by the Oulu group

  • Kunitsyn, V.E., E.S. Andreeva, E.D. Tereshchenko, B.Z. Khudukon, and T. Nygrén, Investigations of the Ionosphere by Satellite Radiotomography, Int. J. Imag. Sys. Tech., 5(2), 112-127, 1994.
  • Markkanen, M., M. Lehtinen, T. Nygrén, J. Pirttilä, P. Henelius, E. Vilenius, E.D. Tereshchenko, and B.Z. Khudukon, Bayesian approach to satellite radiotomography with applications in the Scandinavian sector, Annales Geophysicae, 13, 1277-1287, 1995.
  • Nygrén, T., M. Markkanen, M. Lehtinen, and K. Kaila, Application of stochastic inversion in auroral tomography, Ann. Geophys., 14, 1124-1133, 1996.
  • Nygrén, T., M. Markkanen, M. Lehtinen, E.D. Tereshchenko, B.Z. Khudukon, O.V. Evstafiev, and P. Pollari, Comparison of F region electron density observations by satellite radio tomography and incoherent scatter methods, Ann. Geophys., 14, 1422-1428, 1996.
  • Saksman, E., T. Nygrén, and M. Markkanen: Ionospheric structures invisible in satellite radiotomography. Radio Science, 32, No. 2, 605-616, 1997.
  • Nygrén, T., M. Markkanen, M. Lehtinen, E. D. Tereshchenko and B. Z. Khudukon, Stochastic inversion in ionospheric radiotomography, Radio Science, 32, 2359-2372, 1997.
  • Nygrén, T., K. Kaila, M. Markkanen, and M. Lehtinen, Tomographic inversion of auroral camera or photometer observations. Adv. Space Res., 19, 639­642, 1997.
  • Nygrén, T., Taylor, M.J., Lehtinen, M. S., and Markkanen, M., Application of tomographic inversion in studying airglow in the mesopause region. Ann. Geophys., 16, 1180-1189, 1998.
  • Nygrén, T., Tereshchenko, E. D., Khudukon, B. Z., Evstafiev, O. V., Lehtinen, M., and Markkanen, M., Mapping the ionospheric F region by means of satellite tomography. Acta Geod. Geophys. Hung., 1998 (in press)
  • Tereshchenko, E. D., B. Z. Khudukon, M. O. Kozlova, and T. Nygrén, Anisotropy of ionospheric irregularities determined from the amplitude of satellite signals at a single receiver, Ann. Geophys., 17, 508-518, 1999.
  • Nygrén, T., E. D. Tereshchenko, B. Z. Khudukon, O. V. Evstafiev, M. S. Lehtinen, and M. Markkanen, Manifestations of field-aligned currents in tomographic observations of the ionospheric F region, Adv. Space Res., 26, No. 6, 939-942, 2000.
  • Tereshchenko, E.D., B.Z. Khudukon, M.O. Kozlova, O.V. Evstafiev, T. Nygrén, M.T. Rietveld, and A. Brekke, Comparison of the orientation of small-scale electron density irregularities and F region plasma flow direction, Ann. Geophys., 18, 918-928, 2000.
  • Tereshchenko, E.D., M.O. Kozlova, O.V. Evstafiev, B.Z. Khudukon, T. Nygrén, M. Rietveld, and A. Brekke, Irregular structures of the F layer at high latitudes during ionospheric heating, Ann. Geophys., 18, 1197-1209, 2000.
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