Abstract
Abstract. Tidal oscillations in the equatorial mesosphere and lower thermosphere (MLT) region over Jicamarca (11.95° S, 76.87° W) are studied using the observations from the newly installed Jicamarca All-sky Specular MEteor Radar (JASMET). The vertical structure and seasonal variability of diurnal and semidiurnal tides from 80–100 km are presented. The analyses show a strong diurnal tide over Jicamarca for both zonal and meridional components with the meridional amplitudes being larger than the zonal ones. Maximal diurnal amplitudes, 45 m/s for zonal and 55 m/s for meridional, are observed around equinox. The zonal diurnal amplitudes reach maxima at 90–96 km, while the meridional diurnal amplitudes grow with altitude for most months. Semidiurnal amplitudes vary not as strong as diurnal amplitudes. The vertical structures of the tidal components are compared with Global Scale Wave Model (GSWM02) prediction and the tidal wind analysis results from TIDI measurements onboard of the TIMED satellite. The data from JASMET and TIDI show similar amplitudes for both diurnal and semidiurnal tides. GSWM02 overestimates diurnal amplitudes, but underestimates semidiurnal amplitudes for both zonal and meridional components.
Highlights
Solar atmospheric tides, persistent global-scale waves with periods of integer fractions of a solar day, are one of the dominant oscillations in the mesosphere and lower thermosphere (MLT) region
Diurnal and semidiurnal tidal analyses from 3–20 day Jicamarca All-sky Specular MEteor Radar (JASMET) zonal and meridional observations are compared with GSWM02 values and TIDI results
Comparisons of tidal parameters measured in the equatorial MLT region by meteor radar JASMET (11.95◦ S, 76.87◦ W) from twelve months in 2006–2008 with available TIDI satellite instrument and monthly GSWM02 model results are presented
Summary
Persistent global-scale waves with periods of integer fractions of a solar day, are one of the dominant oscillations in the MLT region. The month-to-month variation of vertical characteristics of atmospheric tides in the equatorial MLT region using JASMET is presented These are the initial results from the system, which are compared with TIDI satellite results (Oberheide and Forbes, 2008; Wu et al, 2008) and monthly GSWM02 (Hagan and Forbes, 2002, 2003) values which take into account both migrating and nonmigrating components. Reconstructed daily TIDI diurnal and semidiurnal tides for zonal and meridional wind from the migrating w1 (from SABER temperatures) and 7 nonmigrating (w4, w3, w2, s0, e1, e2, e3) components (Oberheide and Forbes, 2008) at 10◦ S, 77◦ W in 2007 are compared with the corresponding JASMET data (see Table 2 for the daily TIDI data used in comparison). The characteristics of tidal oscillations and their seasonal variations can be discussed
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