Abstract
Long-term ground-based airglow observations with a spectral airglow temperature imager (SATI) installed at Sierra Nevada Observatory (37.06°N, 3.38°W) at 2900~m height are used to investigate the main features of the quasi planetary waves in the period range of 3–20 days during autumn at this latitude in the mesosphere and lower thermosphere region. The modulations of periods 5 day, (6–7) day, and 10 day have been clearly detected during autumn at this location, being the most prominent waves detected at this location during the autumn. They have a strong persistence during the autumn period and relative amplitudes are generally constant during the period although a slight tendency to increase seems to be detected towards winter.PACS Nos.: 92.60.hw, 92.60.hb, 92.60.hc, 92.60.hh, 92.60.hv
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