Investigation of the amplitude features of high-latitude magnetic impulse events |
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| Authors: | B I Klain N A Kurazhkovskaya O D Zotov |
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| Institution: | 1.Borok Geophysical Observatory, Joint Institute of Physics of the Earth,Russian Academy of Sciences,Borok, Yaroslavskaya oblast,Russia |
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| Abstract: | The features of the amplitude distributions of magnetic impulse events have been investigated using the observations from
a number of high-latitude observatories in the Northern and Southern hemispheres. It has been shown that the tails of the
statistical distribution functions of the impulse amplitudes are approximated by a power law of the form f(A) = A
−α, where A is the impulse amplitude and α is the exponent. Therefore, the magnetic-impulse generation regime corresponds to the features
of the on-off intermittency model. The distribution of the magnetic impulse amplitudes has been analyzed for various geomagnetic
latitudes, local times, seasons, solar activity cycle phases, and interplanetary conditions. It has been found that most statistical
distributions of magnetic impulse amplitudes have the exponent α larger than 2, which is typical of the chaotic regimes called
“strong turbulence.” In some cases, the exponent α is close to 1, which is typical of the regimes generated in a weakly turbulent
medium. Qualitative estimates of the plasma wave turbulence level in the high-latitude magnetosphere have been obtained. |
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