Planetary wave-like oscillations in the ionosphere retrieved with a longitudinal chain of ionosondes at high northern latitudes

Stray, N.H., and P. J. Espy (2017), Planetary wave-like oscillations in the ionosphere retrieved with a longitudinal chain of ionosondes at high northern latitudes, J. Atmos. Sol. Terr. Phys., doi.org/10.1016/j.jastp.2017.10.011 (pdf)