Correspondence between the ULF wave power spatial distribution and auroral oval boundariesстатья

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[1] Correspondence between the ulf wave power spatial distribution and auroral oval boundaries / O. V. Kozyreva, V. A. Pilipenko, M. J. Engebretson et al. // Solar-Terrestrial Physics. — 2016. — Vol. 2, no. 2. — P. 46–65. The world-wide spatial distribution of the wave power in the Pc5 band during magnetic storms have been compared with the auroral oval boundaries. The poleward and equatorward boundaries of auroral oval are estimated using either the British Antarctic Survey database based on UV observations of the aurora by the IMAGE satellite or the OVATION model based on the DMSP particle data. The “epicenter” of the spec-tral power of broadband Pc5 fluctuations during storm growth phase is mapped inside the auroral oval. During the storm recovery phase, the spectral power of narrow-band Pc5 waves, both in the morning and dusk sector, is mapped inside the auroral oval or around its equa-torward boundary. This observational result confirms the effects earlier reported: The spatial/temporal varia-tions of the Pc5 wave power in the morning/pre-noon sector are closely related to the dynamics of the auroral electrojet and magnetospheric field-aligned currents. At the same time, narrowband Pc5 waves demonstrate typi-cal resonant features in the amplitude-phase latitudinal structure. Thus, the location of the auroral oval or its equatorward boundary is the preferred latitude of mag-netospheric field-line Alfven resonator excitation. This effect is not taken into account by modern theories of ULF Pc5 waves but it could be significant for develop-ment of more adequate models. [ DOI ]

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