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Egito Fábio

Institute:
Nacional Institute for Space Research-INPE.
São José dos Campos, Brazil

A SURVEY OF PLANETARY WAVE TYPE OSCILLATIONS IN THE MLT BY AIRGLOW AND WINDS MEASUREMENTS OVER MIDDLE LATITUDE REGIONS

Authors: 1 Egito F., 1 Takahashi H., 2 Shiokawa K., 3 Murayama Y., 1 National Institute for Space Research (INPE), 2 Solar-Terrestrial Environment Laboratory, Nagoya University, 3 National Institute of Information and communications Technology (NICT)
Poster presentation

Planetary wave type oscillations at periods close to 2, 5 and 16 days have been observed in the MLT region and attributed to upward propagation from lower atmosphere of Rossby normal modes. Usually, these waves are observed by neutral wind measurements performed by radars. Nevertheless, several measurements have showed signatures of these waves on the nightglow brightness. Once, nightglow measurements are limited to the nighttime, it is possible that some information can be lost. Thus, it is important that nightglow observations to be carried out simultaneously to wind measurements. Ground-based measurements of the OH(6-2), O2(0-1) and OI5577nm airglow emissions and OH and O2 rotational temperatures at two middle latitude stations, Sata(31.0ºN, 130.7ºE) and Rikubetsu(43.5ºN, 143.8ºE), and neutral wind measurements, performed by two MF radars installed at Yamagawa(31.2°N, 130.6°E) and Wakkanai(45.3°N, 141.8°E), both sites near to Sata and Rikubestu, respectively, were used to survey planetary wave type oscillations in the MLT region. Spectral analysis of nightglow and wind time series showed presence of periodic variation at periods close to 2, 5, 10 and 16 days simultaneously in both nightglow and winds. In this work, we will show and discuss the characteristics of these planetary wave type oscillations observed on nightglow and winds.
planetary waves, airglow, mesospheric winds

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