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标题：On the variability of the quarter-diurnal tide in the MLT over Brazilian low-latitude stations
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作者：Amitava Guharay ; Paulo Prado Batista ; Ricardo Arlen Buriti 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2018
卷号：70
期号：1
页码：1-14
DOI：10.1186/s40623-018-0910-9
出版社：Springer Verlag
摘要：The characteristic features of the quarterdiurnal tide (QDT) in the mesosphere and lower thermosphere (MLT) are investigated using meteor radar observations from three low-latitude southern hemispheric stations, Sao Joao do Cariri (7.4°S, 36.5°W), Cachoeira Paulista (22.7°S, 45°W) and Santa Maria (29.7°S, 53.7°W) in 2005.The QDT shows consistent appearance with a weak enhancement during late summer and fall interval.The QDT amplitudes are found to be much smaller (< 3 m/s) than the longer period tidal components most of the times of the year consistent with the previous investigations carried out from various locations over the globe.The vertical wavelength is found to reach up to 80 km in the MLT maximizing in winter although most of the times it remains within 20 km.Therefore, based on the observed characteristics of the QDT, it is surmised that both the migrating and nonmigrating components are involved in manifestation of the QDT at present locations.Further detailed investigations are sought in connection with the important issues pertained to the actual excitation mechanisms and existing dominant QDT modes in the low-latitude MLT.
关键词：Quarterdiurnal tide; Mesosphere and lower thermosphere; Meteor radar observations