Day-to-day variations of migrating semidiurnal tide in the mesosphere and thermosphere

• Main Authors: Miyoshi,Yasunobu, Fujiwara,Hitoshi
• Format: Report
• Language: English
• Published: Department of Earth and Planetary Sciences, Faculty of Sciences,Kyushu University/Department of Geophysics, Faculty of Science, Tohoku University 2006
• Subjects: semidiurnal tide; dynamical coupling; general circulation model; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=2519; http://id.nii.ac.jp/1291/00002519/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=2519&item_no=1&attribute_id=18&file_no=1

By using a general circulation model, we examine behavior of the migrating semidiurnal tide for solar cycle moderate and geomagnetically quiet conditions. We investigate day-to-day variabilities of the migrating semidiurnal tide in the mesosphere and thermosphere and their relation with the migrating semidiurnal tide generated in the lower atmosphere. The results show that day-to-day variations of the migrating semidiurnal tide are evident from the tropopause to the thermosphere. Fluctuations of the migrating semidiurnal amplitude with periods of 10-12 and 25 days are found at altitudes from 20 to 250km, indicating dynamical coupling between the mesosphere and thermosphere and the lower atmosphere.