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In this second paper, we shall concentrate on the “background wave spectra” which were observed during several magnetically quiet days in the Worldwide Atmospheric Gravity Wave Study (WAGS) campaign. The observed parameters used in this study are the ionization density and the line-of-sight ion velocity. This provides more information than in most of the previous investigations of traveling ionospheric disturbances, in which only electron density perturbations were used. The data will be analyzed and compared with a theoretical model to yield information about the background gravity wave spectrum in the neutral atmosphere. It will be shown that the neutral vertical velocity spectrum can be modeled as a power law type of spectrum. The overall kinetic energy of this spectrum will be calculated and compared with that associated with the special event observed on a magnetically active day.