Comparative analysis of the propagation of magnetic variations and equivalent current vortices of geomagnetic Pc5 pulsations along the meridian and azimuth

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Abstract

For a number of events, the propagation velocities of geomagnetic Pc5 pulsations in the azimuthal and meridional directions were analyzed. Two methods were used: by the phase delays of the signal between stations and by the displacement of the vortex centers of their equivalent current systems. The analysis showed that the distribution of pulsations and vortices coincides in direction: along the meridian they predominantly propagate to the north. In most cases, the propagation velocity of pulsations is 5 km/s, and that of vortices is 2 km/s. In azimuth, pulsations and vortices propagate westward, the propagation velocity of pulsations is 10 km/s, and the vortices velocity is 3 km/s. However, in the distribution of azimuthal velocities of both pulsations and vortices there are maxima of comparable magnitude, corresponding to the eastward propagation: pulsations with a velocity of 10 km/s, and vortices with a velocity of 5 km/s. It is concluded that at the ionospheric level, the phase velocities of pulsations measured by us are approximately 2 times greater than the group velocities of the vortices.

About the authors

A. V. Moiseev

Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: moiseev@ikfia.ysn.ru
Russian Federation, Yakutsk

V. I. Popov

Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch of the Russian Academy of Sciences

Email: volts@mail.ru
Russian Federation, Yakutsk

S. A. Starodubtsev

Yu.G. Shafer Institute of Cosmophysical Research and Aeronomy, Siberian Branch of the Russian Academy of Sciences

Email: starodub@ikfia.ysn.ru
Russian Federation, Yakutsk

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