Articles | Volume 25, issue 3
Ann. Geophys., 25, 639–643, 2007
https://doi.org/10.5194/angeo-25-639-2007
Ann. Geophys., 25, 639–643, 2007
https://doi.org/10.5194/angeo-25-639-2007

  29 Mar 2007

29 Mar 2007

On the use of simultaneous measurements of OH and O2 emissions to investigate wave growth and dissipation

A. Taori1, A. Guharay1, and M. J. Taylor2 A. Taori et al.
  • 1Aryabhatta Research Institute of Observational Sciences, Nainital, India
  • 2Department of Physics, Utah State University, Logan, UT, USA

Abstract. Simultaneous measurements of mesospheric OH (6–2) Meinel and O2 (0–1) Atmospheric band emissions from a low-latitude station, Maui, Hawaii (20.8° N, 156.2° W) are utilized to study the wave characteristics and associated processes. Deduced temperatures show large variability in both OH and O2 data. The seasonal variability in the temperature shows a well-defined, semiannual type of oscillation, which are comparable to the ground-based rocket sounding data. The "Wave Growth Factor", a ratio of normalized perturbation amplitude in O2 to the OH temperature variability, is estimated for principal as well as residual smaller period components of the nocturnal variability. It is noticed that smaller period waves (less than 12 h) occasionally have large growth factors of about 3–4 during equinox transitions, an indication of wave amplitude amplification within the 87–94 km altitudes while a strong wave-dissipation occurs throughout the year.