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We apply scintillation theory to stellar signal fluctuations in thehigh-resolution, high signal/noise, dual-wavelength data from the MMTobservation of the 2007 March 18 occultation of P445.3 by Pluto. A well-definedhigh wavenumber cutoff in the fluctuations is consistent with viscous-thermaldissipation of buoyancy waves (internal gravity waves) in Pluto's highatmosphere, and provides strong evidence that the underlying densityfluctuations are governed by the gravity-wave dispersion relation.

Buoyancy waves in Pluto's high atmosphere: Implications for stellar occultations