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Diurnal mesospheric tidal winds observed simultaneously by meteor radars in Costa Rica (10° N, 86° W) and Brazil (7° S, 37° W)
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Diurnal mesospheric tidal winds observed simultaneously by meteor radars in Costa Rica (10° N, 86° W) and Brazil (7° S, 37° W)
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Diurnal mesospheric tidal winds observed simultaneously by meteor radars in Costa Rica (10° N, 86° W) and Brazil (7° S, 37° W)
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Journal Article
Diurnal mesospheric tidal winds observed simultaneously by meteor radars in Costa Rica (10° N, 86° W) and Brazil (7° S, 37° W)
2020
Overview
This paper presents a study of diurnal tidal winds
observed simultaneously by two meteor radars located on each side of the
Equator in the equatorial region. The radars were located in Santa Cruz, Costa Rica
(10.3∘ N, 85.6∘ W) (hereafter CR) and
São João do Cariri, Brazil (7.4∘ S, 36.5∘ W) (hereafter CA). The distance between the sites is 5800 km. Harmonic analysis
has been used to obtain amplitudes and phases (hour of peak amplitude) for
diurnal, semidiurnal and terdiurnal tides between 82 and 98 km altitude, but
in this work we concentrate on the diurnal component. The period of
observation was from April 2005 to January 2006. The results were compared
to the Global Scale Waves Model (GSWM-09). Magnitudes of zonal and meridional amplitudes from
November to January for CR were quite different from the predictions of the
model. Concerning phases, the agreement between model and radar meridional
tidal phases at each site was good, and a vertical wavelength of 24 km for
the diurnal tide was observed practically every month, although on some
occasions determination of the vertical wavelength was difficult, especially
for the zonal component, due to nonlinear phase variations with height. For
the diurnal zonal amplitude, there were notable differences between the two
sites. We attribute this site-to-site difference of the diurnal zonal
amplitude to the nonmigrating component of the tide and propose that an
anomaly was present in the troposphere in the winter (Northern Hemisphere)
of 2005–2006 which produced substantial longitudinal variation.
