Mesospheric tides comparisons at low latitudes observed by two collocated meteor radars

Accurate knowledge of mesospheric winds and waves is essential for studying the dynamics and climate in the mesosphere and lower thermosphere (MLT) region. In this study, we conducted a comparative analysis of the mesosphere tidal results obtained from these two adjacent meteor radars at low latitudes in Kunming， China from November 2013 to December 2014 were analyzed and compared. These two radars operate at different frequencies of 37.5 MHz and 53.1 MHz, respectively. However, an overall good agreement was observed between the two radars in terms of horizontal winds and tide observations. The results showed that the dominant tidal waves of the zonal and meridional winds are diurnal and semidiurnal tides. Moreover, we conducted an exhaustive statistical analysis to compare the tidal amplitudes and vertical wavelengths recorded by the dual radar systems, which revealed a high degree of alignment in tidal dynamics. The investigation included variances and covariances of tidal amplitudes, which demonstrated remarkable consistency across measurements from both radars. This finding highlights a clear uniformity in the mesospheric tidal patterns observed at low latitudes by the two neighboring meteor radars. The comparative analysis specifically underscores the significant correlation in vertical wavelength measurements, validating the robustness of radar observations for tidal research.