Abstract
We have analyzed a short-term (3–4 s) burst of geomagnetic pulsations in the frequency range of 0.2–5 Hz observed during the commencement of a magnetic storm on March 17, 2015. The burst was observed by a network of observatories in different sectors of local time and at different latitudes. The spectra of pulsations involves a resonant structure with a global maximum at a frequency of 2.78 ± 0.38 Hz, despite some differences at different observatories. There is a delay by almost 4 s in the maximum of the train amplitude at nightside observatories with respect to a dayside observatory. The burst of pulsations has been shown to be on the front of the magnetic disturbance associated with sudden storm commencement (SSC) and, therefore, can be considered as a precursor. The observations of particle fluxes by low-orbit satellites have shown that the SSC is accompanied by a dramatic increase in the fluxes of precipitating protons and electrons. We have suggested that the mechanism of oscillation generation may be the ion–cyclotron instability of ring current protons and the resonant structure of pulsations may be associated with the ionospheric Alfvén resonator.
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Original Russian Text © V.A. Parkhomov, N.L. Borodkova, A.G. Yahnin, A.V. Suvorova, B.V. Dovbnya, A.Yu. Pashinin, B.V. Kozelov, 2017, published in Kosmicheskie Issledovaniya, 2017, Vol. 55, No. 5, pp. 323–336.
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Parkhomov, V.A., Borodkova, N.L., Yahnin, A.G. et al. Global impulse burst of geomagnetic pulsations in the frequency range of 0.2–5 Hz as a precursor of the sudden commencement of St. Patrick’s Day 2015 geomagnetic storm. Cosmic Res 55, 307–317 (2017). https://doi.org/10.1134/S0010952517050070
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DOI: https://doi.org/10.1134/S0010952517050070