Abstract
The results of studying the distribution character of the amplitudes and time intervals between wave packets of Pi2 geomagnetic pulsations, observed during the nighttime development of magnetospheric substorms and in the absence of these phenomena, have been presented. The analog records from the midlatitude Borok Geophysical Observatory (geographic coordinates φ = 58.03°; λ = 38.97°) for 1995 and 1997 have been used to analyze Pi2 pulsations. Three groups of pulsations have been analyzed: Pi2 observed during sub-storms related to the external impact on the magnetosphere, Pi2 spontaneously originating during substorms, and Pi2 observed in the absence of substorms on the nightside of the magnetosphere. Interplanetary magnetic field B y and B z components and the solar wind dynamic pressure (ρV 2) have been considered as possible triggers of magnetospheric substorms. It has been indicated that the distributions of the amplitude and the duration of time intervals between Pi2 bursts are approximated by the power and exponential functions, respectively, which is typical of intermittent processes. The hypothesis that the processes of magnetospheric plasma turbulization can be among the Pi2 pulsation burst sources has been put forward. It is assumed that the obtained characteristic values can be used to qualitatively estimate the degree of plasma turbulence on the nightside of the magnetosphere when a sequence of Pi2 wave packets is excited.
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Original Russian Text © N.A. Kurazhkovskaya, B.I. Klain, 2010, published in Solnechno-Zemnaya Fizika, 2010, Vol. 15, pp. 58–65.
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Kurazhkovskaya, N.A., Klain, B.I. Intermittency in midlatitude Pi2 pulsations observed during magnetospheric substorms and in the absence of these phenomena. Geomagn. Aeron. 50, 970–977 (2010). https://doi.org/10.1134/S0016793210080074
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DOI: https://doi.org/10.1134/S0016793210080074