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Dependence of the Pc4 magnetic pulsation parameters on the radiated power of the EISCAT HF heating facility

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The interaction between the Earth’s ionosphere and magnetosphere in a situation when artificial disturbances are generated in the F region of the auroral ionosphere with the EISCAT/Heating facility is studied. An experiment was performed in the daytime when the facility effective radiated power changed in a stepwise manner. Wavelike disturbances with periods of (130–140) s corresponding to Pc4 pulsations were simultaneously registered by the method of bi-static backscatter and with ground magnetometers. The variations in the Doppler frequency shift were correlated with the changes in the facility power. Incoherent scatter radar measurements at a frequency of 930 MHz (Tromsö) and numerical calculations were used in an analysis. It has been indicated that the ionospheric drift of small-scale artificial ionospheric irregularities was modulated by magnetospheric Alfvén waves. The possible effect of powerful HF radioemission on the Alfvén wave amplitude owing to the modification of the magnetospheric resonator ionospheric edge reflectivity and the generation of an outgoing Alfvén wave above the region where the ionospheric conductivity is locally intensified has been considered.

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Correspondence to T. D. Borisova.

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Original Russian Text © T.D. Borisova, N.F. Blagoveshchenskaya, I.M. Ivanova, M.T. Rietveld, 2013, published in Geomagnetizm i Aeronomiya, 2013, Vol. 53, No. 1, pp. 35–45.

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Borisova, T.D., Blagoveshchenskaya, N.F., Ivanova, I.M. et al. Dependence of the Pc4 magnetic pulsation parameters on the radiated power of the EISCAT HF heating facility. Geomagn. Aeron. 53, 32–42 (2013).

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