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Analysis of latitudinal distribution of Pi2 geomagnetic pulsations using the generalized variance method

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Abstract

The spatial dynamics of bursts of geomagnetic Pi2-type pulsations during a typical event of a magnetospheric substorm (April 13, 2010) drifting to the pole was investigated using the method of generalized variance characterizing the integral time increment of the total horizontal amplitude of the wave at a given point in the selected time interval. The digital data of Scandinavian profile observations from IMAGE magnetometers with 10-second sampling and data of the INTERMAGNET project observations at the equatorial, middle-latitude and subauroral latitudes with a 1-second sampling were used in the analysis. It was shown that Pi2 pulsation bursts in a frequency band of 8–20 mHz appear simultaneously on a global scale: from the polar to equatorial latitudes with maximum amplitudes at latitudes of the maximum intensity of the auroral electrojet and with a maximum amplitude of geomagnetic pulsations Pi3 within a band of 1.5–6 mHz. The first (left-polarized) intensive Pi2 burst appeared at auroral latitudes several minutes after breakup, while the second (right-polarized) burst occurred 15 min after breakup but at higher (polar) latitudes where the substorm had displaced by that time. The direction of wave-polarization vector rotation was opposite for auroral and subauroral latitudes, but it was identical at the equator and in the subauroral zone. The pulsation amplitude at the equator was maximal in the night sector.

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Authors and Affiliations

  1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia

    N. G. Kleimenova & N. R. Zelinsky

  2. St. Petersburg Branch of Pushkov Institute for Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, St. Petersburg, Russia

    A. L. Kotikov

  3. St. Petersburg State University, St. Petersburg, Russia

    A. L. Kotikov

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  1. N. G. Kleimenova
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  2. N. R. Zelinsky
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  3. A. L. Kotikov
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Correspondence to N. G. Kleimenova.

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Original Russian Text © N.G. Kleimenova, N.R. Zelinsky, A.L. Kotikov, 2014, published in Geomagnetizm i Aeronomiya, 2014, Vol. 54, No. 3, pp. 333–340.

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Kleimenova, N.G., Zelinsky, N.R. & Kotikov, A.L. Analysis of latitudinal distribution of Pi2 geomagnetic pulsations using the generalized variance method. Geomagn. Aeron. 54, 308–315 (2014). https://doi.org/10.1134/S0016793214030098

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