Seasonal variations of emission characteristics of the mesopause hydroxyl with different vibrational excitation Original Research Article

Observations of the hydroxyl band in the near infrared region 0.77 – 1.04 μm were made at the Zvenigorod Observatory (56N, 37E), Russia, during 2000–2001. An analysis of seasonal variations of the emission intensities and rotational temperatures was carried out. The main feature of these characteristics is a dependence of the amplitudes and phases of their seasonal variations on the vibrational level of the hydroxyl. This is probably due to a height shift of the hydroxyl emission layers and the height variations of the seasonal atmospheric dynamics.