Interaction between artificial ionospheric irregularities and natural MHD waves

Details Interaction between artificial ionospheric irregularities and natural MHD waves Interaction between artificial ionospheric irregularities and natural MHD waves

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105..171p&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A1, p. 171-182

Physics

5

Ionosphere: Active Experiments, Ionosphere: Ionospheric Irregularities, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Mhd Waves And Instabilities

Scientific paper

This paper concerns the interaction between small-scale artificial ionospheric inhomogeneities and large-scale natural MHD waves (geomagnetic pulsations). The inhomogeneities were produced at F region altitudes by powerful HF radiation from the Sura heating facility in Russia. Diagnostics were provided by resonant scattering of decametric radio waves emitted by several broadcast and dedicated transmitters. The scattered waves were received at the UTR-2 radio telescope in Ukraine with a multichannel coherent receiver equipped with highly directional phased antenna arrays. This instrument allowed us to investigate spatial and temporal variations in intensity and frequency of the signals scattered by the inhomogeneities with the scale size of l~=10m. Previous investigations have shown the existence of quasi-sinusoidal variations in the signal frequency associated with the E×B plasma drift due to the MHD wave. In this study, we investigate similar periodicities in the signal intensity, which in some cases were observed simultaneously with the frequency variations. However, unlike the frequency variations, the intensity oscillations appeared to be considerably nonuniform within the pumped region of the ionosphere with a horizontal scale size of L~=100km. We discuss different explanations for the detected effect and suggest that its most probable cause is a transformation of the MHD wave energy into the energy of the inhomogeneities.

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