Signature of the 27-day oscillation in the MLT tides and its relation with solar radiation at low latitudes

被引：0

作者：

Amitava Guharay

Paulo Prado Batista

Ricardo Arlen Buriti

Nelson Jorge Schuch

机构：

[1] Space and Atmospheric Sciences Division,Aeronomy Division

[2] Physical Research Laboratory,undefined

[3] National Institute for Space Research,undefined

[4] INPE,undefined

[5] Federal University of Campina Grande,undefined

[6] Southern Regional Space Research Center-CRCRS,undefined

[7] COCRE/INPE-MCTIC,undefined

来源：

Earth, Planets and Space | / 72卷

关键词：

27-day oscillation; Tides in the MLT; Meteor radar observations;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The modulation of the dominant atmospheric tides (i.e. diurnal, semidiurnal and terdiurnal) in the mesosphere and lower thermosphere (MLT) is investigated using long-term meteor wind database from three Southern hemispheric low-latitude locations, São João do Cariri (7.4° S, 36.5° W), Cachoeira Paulista (22.7° S, 45° W) and Santa Maria (29.7° S, 53.7° W). The spectral analysis reveals an evident and intermittent signature of a 27-day oscillation in the tidal amplitudes. Relationship between the 27-day tidal modulation in the MLT and solar rotation is looked into utilizing solar UV flux (Lyman-α) that indicates a conspicuous linkage of the tides with the solar short-term variability. The strong correlation between the solar variability and tidal modulation in the concerned period with positive lags at certain intervals may indicate predominate solar influence on the MLT tides. Potential involvement of the lower, middle and upper atmospheric dynamics and chemistry to support the observed oscillation feature is deemed plausible. [graphic not available: see fulltext]

引用

共 28 条

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