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The Spread F Experiment, or SpreadFEx, was performed from September toNovember 2005 to define the potential role of neutral atmosphere dynamics,primarily gravity waves propagating upward from the lower atmosphere, inseeding equatorial spread F (ESF) and plasma bubbles extending to higheraltitudes. A description of the SpreadFEx campaign motivations, goals,instrumentation, and structure, and an overview of the results presented inthis special issue, are provided by Fritts et al. (2008a). The variousanalyses of neutral atmosphere and ionosphere dynamics and structuredescribed in this special issue provide enticing evidence of gravity wavesarising from deep convection in plasma bubble seeding at the bottomside Flayer. Our purpose here is to employ these results to estimate gravity wavecharacteristics at the bottomside F layer, and to assess their possiblecontributions to optimal seeding conditions for ESF and plasma instability growth rates.We also assess expected tidal influences on the environment in whichplasma bubble seeding occurs, given their apparent large wind andtemperature amplitudes at these altitudes. We conclude 1) that gravity waves can achievelarge amplitudes at the bottomside F layer, 2) that tidal winds likely controlthe orientations of the gravity waves that attain the highest altitudes  andhave the greatest effects, 3) that the favored gravity wave orientationsenhance most or all of the parameters influencing plasma instability growth rates,and 4) that gravity wave and tidal structures acting together have an evengreater potential impact on plasma instability growth rates and plasma bubble seeding

Gravity wave and tidal influences on equatorial spread F based on observations during the Spread F Experiment (SpreadFEx)