Abstract
According to the data of the IMAGE network of magnetometers the latitudinal profile of the amplitude of the Pc5 geomagnetic pulsations is constructed, which are excited in the Earth’s magnetosphere in the form of the resonance Alfvén magnetohydrodynamic pulsations. The approaches to the solution of two problems are studied on a specific example. The first concerns the anharmonicity of Alfvén’s resonances. The displacement of the peak of the resonance curve towards to the north with the reduction of the amplitude of the pulsations is discovered. Based on the results of measurements, the nonlinear distortion coefficient of the latitudinal profile is determined. The second problem is connected with the magnetotelluric sounding. Information about the resonance structure of the Alfvén pulsations is useful for magnetotelluric sounding. This information gives the possibility of evaluating the accuracy of the sounding with the application of the local impedance relationship and of introducing corrections if necessary.
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Original Russian Text © A.V. Guglielmi, A.S. Potapov, 2009, published in Fizika Zemli, 2009, No. 10, pp. 9–13.
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Guglielmi, A.V., Potapov, A.S. On the latitudinal structure of the magnetohydrodynamic Alfvén resonances. Izv., Phys. Solid Earth 45, 845–849 (2009). https://doi.org/10.1134/S1069351309100024
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DOI: https://doi.org/10.1134/S1069351309100024