Abstract
In this work, the results of comparative analysis of morphological regularities of right-polarized (R type) and left-polarized (L type) isolated bursts of ipcl pulsations (irregular pulsations continuous long period) with an anomalously large amplitude in the region of the daytime polar cusp, as well as conditions of their excitation, are presented. It has been found that R and L bursts are similar in the maximum amplitude level, wave packet duration, spectral composition, magnitude of ellipticity, diurnal variation shape, and other characteristics. At the same time, bursts of the R and L type are excited at different degrees of plasma turbulence in the generation region, at different IMF orientations in the plane of ecliptic, as well as in the plane perpendicular to it, and at different dynamics of the parameter β (characterizing the ratio of the thermal pressure to the magnetic pressure) and Alfvén Mach number Ma. It is supposed that the generation of isolated bursts of the R and L types can be related to the amplification of the plasma turbulence level due to the development of wind instability at the front boundary of the magnetosphere, and features of their polarization can be interpreted in the scope of the model of nonlinear propagation of Alfvén waves.
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Original Russian Text © N.A. Kurazhkovskaya, B.I. Klain, 2017, published in Geomagnetizm i Aeronomiya, 2017, Vol. 57, No. 5, pp. 609–622.
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Kurazhkovskaya, N.A., Klain, B.I. Isolated bursts of irregular geomagnetic pulsations in the region of the dayside cusp. Geomagn. Aeron. 57, 566–578 (2017). https://doi.org/10.1134/S0016793217040119
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DOI: https://doi.org/10.1134/S0016793217040119