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We examine the Pc5 wave power latitudinal distribution in the morning sector along the conjugate magnetometer arrays in Greenland and Antarctica. These distributions are compared with the location of the auroral oval, reconstructed using the OVATION-prime model. This model makes it possible to reconstruct separately the spatial structures of diffuse and monoenergetic precipitation of auroral electrons. Mapping of the spectral power of narrowband Pc5 waves onto the auroral oval has shown that the wave power in the morning sector is localized inside the auroral oval, namely at the poleward edge of diffuse precipitation, but near the peak of monoenergetic precipitation. The case analysis results have been confirmed by a larger statistical study. This observational result confirms the effects earlier found in case studies: the spatial/temporal variations of Pc5 wave power are closely related to the location of the auroral electrojet and magnetospheric field-aligned currents. From the observed relationship between the wave power and the auroral boundaries, it may be concluded that the poleward edge of the diffuse precipitation, around the maximum of the monoenergetic precipitation, is preferred latitude of magnetospheric field-line resonance excitation. This effect is not taken into account by modern theories of ULF Pc5 waves. © 2018 BBSCS RN SWS. All rights reserved

Correspondence between the latitudinal ULF wave power distribution and auroral oval in conjugate ionospheres