Amplitude–frequency characteristics of ion–cyclotron and whistler-mode waves from Van Allen Probes data

Abstract

Using two-hour (from 2300 UT January 25, 2013 to 0100 UT January 26, 2013) measurement data from Van Allen Probes on fluxes of energetic particles, cold plasma density, and magnetic field magnitude, we have calculated the local growth rate of electromagnetic ion–cyclotron and whistler-mode waves for field-aligned propagation. The results of these calculations have been compared with wave spectra observed by the same Van Allen Probe spacecraft. The time intervals when the calculated wave increments are sufficiently large, and the frequency ranges corresponding to the enhancement peak agree with the frequency–time characteristics of observed electromagnetic waves. We have analyzed the influence of variations in the density and ionic composition of cold plasma, fluxes of energetic particles, and their pitch-angle distribution on the wave generation. The ducted propagation of waves plays an important role in their generation during the given event. The chorus VLF emissions observed in this event cannot be explained by kinetic cyclotron instability, and their generation requires much sharper changes (“steps”) for velocity distributions than those measured by energetic particle detectors on Van Allen Probes satellites.

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Correspondence to A. A. Lyubchich.

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Original Russian Text © A.A. Lyubchich, A.G. Demekhov, E.E. Titova, A.G. Yahnin, 2017, published in Geomagnetizm i Aeronomiya, 2017, Vol. 57, No. 1, pp. 45–56.

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Lyubchich, A.A., Demekhov, A.G., Titova, E.E. et al. Amplitude–frequency characteristics of ion–cyclotron and whistler-mode waves from Van Allen Probes data. Geomagn. Aeron. 57, 40–50 (2017). https://doi.org/10.1134/S001679321701008X

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