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Atmospheric gravity wave effect on the airglow O (0,1) and OH (9,4) band intensity and temperature variations observed from a low latitude station

1992; Elsevier BV; Volume: 12; Issue: 10 Linguagem: Inglês

10.1016/0273-1177(92)90454-6

1879-1948

H. Takahashi, Y. Sahai, P. P. Batista, B. R. Clemesha,

GNSS positioning and interference

Simultaneius meausurements of the night airglow O2 atmospheric (0,1) band (864.5 nm) and OH(9,4) band (774.6 nm) emissions have been carried out at Cachoeira Paulista (22.7oS, 45.0oW) since 1983. We present a study of gravity wave induced variations in the emission intensities and rotational temperatures. For both the emissions, the intensity variations are normally delayed with respect to the temperature variations, and the phase difference is larger for OH(9,4) than for O2(0,1). The ratio between the amplitudes of fluctuation of the intensity and temperature, expressed as η = (δI/I/(δT/T) has been calculated for both the emissions. The mean value of η for OH(9,4) was 4.9 with a range of 1.03 to 7.9, in agreement with a recent model. For the O2A(0,1) band, varied from 3.4 to 16.1, with a mean of 7.1. The relation between η and the fluctuation period is also different for the two emissions.