Coincident imaging and spectrometric observations of zenith OH nightglow structure

Physics

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Aloha System, Hydroxyl Radicals, Infrared Spectra, Near Infrared Radiation, Nightglow, Brunt-Vaisala Frequency, Charge Coupled Devices, Fourier Transformation, Gravity Waves, Infrared Imagery, Spectral Bands

Scientific paper

During the ALOHA-90 campaign, a novel comparative study was made between near-infrared wave structure imaged in the zenith using a CCD camera and that detected at infrared wavelengths by a Fourier Transform Spectrometer. Coincident measurements were made briefly on several occasions and for an extended period on March 31. The temporal variations imaged in the near-infrared structure during this night almost completely matched those detected in the OH (3,1) band spectrometer data when similar viewing fields were compared. However, the image data also displayed small scale wave forms that were not resolved by the larger field instrument. These structures exhibited significant changes in brightness and position on a time scale much shorter than the local Brunt-Vaisala period indicating that very high resolution measurements are necessary to investigate short period (less than 20 min) upper-atmospheric wave motions.

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