| Budget Amount *help |
¥46,930,000 (Direct Cost: ¥36,100,000、Indirect Cost: ¥10,830,000)
Fiscal Year 2014: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Fiscal Year 2013: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Fiscal Year 2012: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
Fiscal Year 2011: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
Fiscal Year 2010: ¥10,790,000 (Direct Cost: ¥8,300,000、Indirect Cost: ¥2,490,000)
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| Outline of Final Research Achievements |
We studied the behavior of atmospheric waves as well as long-term variations of the monthly mean winds in the Mesosphere-Lower Thermosphere (MLT) region at 60-150 km altitude, focusing on the coupling processes between different atmospheric layers due to upward propagating waves. We utilized archived data-sets (IUGONET) collected by a number of meteor and medium frequency (MF) radars operated continuously for many years since 1990’s at low latitudes in Asia and Pacific regions. We investigated seasonal variations of the atmospheric gravity activity in the tropics, and found its relation with cloud convection in the lower atmosphere. Monthly mean zonal and meridional winds exhibited peculiar variations with semi-annual (SAO), annual, quasi-biennial (QBO), and intra-seasonal periods. Our analysis suggested importance of interaction of atmospheric waves with the mean flow to drive these regular and irregular variations. The mean meridional winds showed a trend with a decadal time scale.
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