Photographic evidence of waves around the 85 km level

Computer Science

Scientific paper

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Hydroxyl Emission, Infrared Photography, Ionospheric Propagation, Nightglow, Photographic Recording, Wave Propagation, Data Reduction, E Region, Optical Thickness, Pattern Recognition, Propagation Velocity

Scientific paper

Photographs are presented and analyzed which reveal regular wave-like structure in OH emissions between 758 and 895 nm over areas as large as 1000 x 1000 km. For example, a parallax determination performed between two sites in the Alps yielded an altitude of about 85 km for the emissive layer. The wave crests corresponding to the bright features visible on the photographs were often as long as 600 km and as numerous as 20. Two or three wave patterns could be distinguished simultaneously. The horizontal wavelength between crests was found to be comprised between 30 and 70 km, and the horizontal velocity was of the order of 15-20 m/sec or lower.

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