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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 17, issue 4
Ann. Geophys., 17, 508–518, 1999
https://doi.org/10.1007/s00585-999-0508-4
© European Geosciences Union 1999
Ann. Geophys., 17, 508–518, 1999
https://doi.org/10.1007/s00585-999-0508-4
© European Geosciences Union 1999

  30 Apr 1999

30 Apr 1999

Anisotropy of ionospheric irregularities determined from the amplitude of satellite signals at a single receiver

E. D. Tereshchenko1, B. Z. Khudukon1, M. O. Kozlova1, and T. Nygrén2 E. D. Tereshchenko et al.
  • 1Polar Geophysical Institute, 15 Khalturina, 183010 Murmansk, Russia
  • 2Department of Physical Sciences, University of Oulu, FIN-90570 Oulu, Finland

Abstract. A new method of determining the anisotropy parameters of small-scale irregularities in the ionospheric F region is presented and experimental results are shown. The method is based on observations of amplitude fluctuations of radio waves transmitted by satellites flying above the F region. In practice, Russian navigational satellites are used and both the amplitude and the phase of the received signal is measured on the ground level. The method determines both the field-aligned anisotropy and the field-perpendicular anisotropy and orientation of the spatial spectrum of the irregularities, assuming that the contours of constant power have an elliptic shape. A possibility of applying the method to amplitude tomography is also discussed. Using a chain of receivers on the ground level, one could locate the regions of small-scale irregularities as well as determine their relative intensities. Then the large-scale background structures could be mapped simultaneously by means of ordinary ray tomography using the phase observations, and therefore the relations of small-scale and large-scale structures could be investigated.

Key words. Ionosphere (auroral ionosphere; ionospheric irregularities; instruments and techniques)

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