### Abstract

The unambiguous 2-D horizontal wave number spectrum of gravity wave perturbations in OH emission intensities is computed from imager observations acquired on 2 Feb 1995 at the Starfire Optical Range, NM. The technique involves computing the (ω, k, l) = (ω, h, φ) spectrum of OH images collected over a several hour period, where k is the zonal wave number, l is the meridional wave number, h = (k^{2} + l^{2})1/2, φ = tan^{-1} (k/l), and ω is the temporal frequency. The data are used to study the azimuthal distribution of wave energy propagation and the separability of the (h, φ) spectrum. The h spectral indices, computed from power-law fits of the 2-D spectrum over the wave number range 2π/(200 km) < h < 2π/(20 km), vary between -1.6 and -3.6 as a function of φ with a mean of -2.58. Consequently, the image spectrum is not separable in h and φ. We show that nonseparability is most likely associated with distortion of the wave perturbations caused by the viewing geometry at large zenith angles.

Original language | English (US) |
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Article number | 96GL03158 |

Pages (from-to) | 3739-3742 |

Number of pages | 4 |

Journal | Geophysical Research Letters |

Volume | 23 |

Issue number | 25 |

DOIs | |

State | Published - Jan 1 1996 |

### ASJC Scopus subject areas

- Geophysics
- Earth and Planetary Sciences(all)