Year-end Sale % OFF 
Abstract
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.
Highlights
Atmospheric tides are one of the most prominent dynamical entities that transfer significant amount of energy from the lower atmosphere to mesosphere and lower thermosphere (MLT) and modify the ambient dynamical condition considerably (Miyahara et al 1993; Hagan and Forbes 2002)
Since Sun is the major source of energy of the Earth, it has potential to control and modify various physical, chemical and dynamical processes occurring at various levels in the Earth atmosphere
Solar Lyman‐α flux To find out the solar linkage of the observed 27-day modulation in the tidal amplitudes obtained from the zonal wind in the MLT, solar Lyman-α flux (121.6 nm) data provided by the Laboratory for Atmospheric and Space Physics (LASP), University of Colorado, corresponding to the selected intervals are analyzed
Summary
Atmospheric tides are one of the most prominent dynamical entities that transfer significant amount of energy from the lower atmosphere to mesosphere and lower thermosphere (MLT) and modify the ambient dynamical condition considerably (Miyahara et al 1993; Hagan and Forbes 2002). An extensive investigation related to the imprint of the 27-day signal on the dominant MLT tides and its relationship with the solar rotation is carried out using meteor radar wind observations from three low-latitude Southern hemispheric stations, São João do Cariri (7.4° S, 36.5° W) (CA), Cachoeira Paulista (22.7° S, 45° W) (CP) and Santa Maria (29.7° S, 53.7° W) (SM).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
