First observation of the diurnal and semidiurnal ocillation in the mesospheric winds over São João do Cariri-PB, Brazil

Lima, Lourivaldo Mota; Paulino, Ana Roberta; Medeiros, A. F.; Buriti, R. A.; Batista, P. P.; Clemesha, B. R.; Takahashi, H.

doi:10.1590/s0102-261x2007000600005

Cited by 11 publications

(12 citation statements)

References 12 publications

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“…The wind patterns presented indicate a semi-diurnal tide oscillation. This type of intensification of the semi-diurnal tidal mode in the wind field has been reported by Lima et al (2007) and Buriti et al (2008). The zonal wind intensification was larger above 90 km, reaching values of −120 ms −1 (westward) at 97 km.…”

Section: Propagation Condition For the Mesospheric Frontsupporting

confidence: 80%

First observation of an undular mesospheric bore in a Doppler duct

et al. 2009

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Abstract. On 1 October 2005, during the SpreadFEx campaign, a distinct mesospheric bore was observed over São João do Cariri (7.4 • S, 36.5 • W), Brazil by using airglow allsky imagers. The event appeared both in the OI5577 and OH emissions, forming a well extended wave front which was followed by short waves from behind. Simultaneous wind and temperature data obtained by the meteor radar and the TIMED/SABER satellite instrument revealed that the bore event occurred during the Doppler ducting condition in the emission layers.

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Section: Propagation Condition For the Mesospheric Frontsupporting

confidence: 80%

First observation of an undular mesospheric bore in a Doppler duct

et al. 2009

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“…The amplitudes of the diurnal and semidiurnal tides were extracted by applying the harmonic analyses to a 2-day long moving window and stepped forward by 1 day. As the diurnal tide is dominant at Cariri latitude (e.g., Lima et al, 2007), only the amplitudes of the diurnal tide in the zonal (Fig. 7a) and meridional (Fig.…”

Section: Interaction Between the Ufkw And The Diurnal Tidementioning

confidence: 99%

Ultrafast Kelvin waves in the MLT airglow and wind, and their interaction with the atmospheric tides

et al. 2018

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Abstract. Airglow and wind measurements from the Brazilian equatorial region were used to investigate the presence and the effects of the 3-4-day ultrafast Kelvin waves in the MLT. The airglow integrated intensities of the OI557.7 nm, O 2 b(0-1) and OH(6-2) emissions, as well as the OH rotational temperature, were measured by a multichannel photometer, and the zonal and meridional wind components between 80 and 100 km were obtained from a meteor radar. Both instruments are installed in the Brazilian equatorial region at São João do Cariri (7.4 • S, 36.5 • W). Data from 2005 were used in this study. The 3-4-day oscillations appear intermittently throughout the year in the airglow. They were identified in January, March, July, August and October-November observations. The amplitudes induced by the waves in the airglow range from 26 to 40 % in the OI557.7 nm, 17 to 43 % in the O 2 b(0-1) and 15 to 20 % in the OH(6-2) emissions. In the OH rotational temperature, the amplitudes were from 4 to 6 K. Common 3-4-day oscillations between airglow and neutral wind compatible with ultrafast Kelvin waves were observed in March, August and October-November. In these cases, the amplitudes in the zonal wind were found to be between 22 and 28 m s −1 and the vertical wavelength ranges from 44 to 62 km. Evidence of the nonlinear interaction between the ultrafast Kelvin wave and diurnal tide was observed.

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“…In this work, the zonal and meridional winds were estimated in seven height intervals of 4 km thickness, separated by 3 km, centered at 81,84,87,90,93,96 Because the atmospheric tides, primarily the diurnal tides Lima et al, 2007), are one of the remarkable features of the MLT winds over C. Paulista and Cariri, the data series were subjected to a low-pass filter in order to remove the variances associated with high frequencies. For this, a low-pass filter with a cutoff period of 1.5 days was used.…”

Section: Radar Systems and Data Seriesmentioning

confidence: 99%

Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S

Araújo¹,

Lima²,

Batista

et al. 2014

Ann. Geophys.

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Abstract. In this study we have used wind observation data from the mesosphere and lower thermosphere (MLT) region, obtained from meteor radar measurements in São João do Cariri . From the spectral analysis it was possible to identify the presence of planetary-scale oscillations in the hourly winds for the two latitudes and to study their transient character, which allowed elaboration of a climatology of planetary oscillation signatures. Planetary waves with periods near 2-days, 6-7 days, and 16 days were focussed on in this study. The quasi-2-day waves in the meteoric winds showed a seasonal cycle, with intense amplitudes occurring after the austral summer solstice and extending until the end of the season. The vertical wavelengths of the 2-day wave over Cachoeira Paulista were larger than those at São João do Cariri. A possible modulation of the quasi-2-day wave amplitudes by the quasi-biennial oscillation (QBO) has been observed only at São João do Cariri. The 6-7 day oscillations presented more intense amplitudes during August-November but were present with lower amplitudes during March-April at both sites. The 6-7 day vertical wavelengths over São João do Cariri were larger than at Cachoeira Paulista. The 6-7 day amplitudes exhibited intra-seasonal and annual behavior, however, there was no clear evidence of QBO modulation. The 16-day oscillations showed a seasonal cycle at São João do Cariri, with amplifications from austral spring to mid-summer and weaker amplitudes from autumn until early winter, however, there was no clear seasonality over Cachoeira Paulista. The 16-day vertical wavelengths have assumed values of λ z ∼ 45-85 km over both sites. 16-day wave amplitudes at the two sites showed different long-term behaviors.

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First observation of the diurnal and semidiurnal ocillation in the mesospheric winds over São João do Cariri-PB, Brazil

Cited by 11 publications

References 12 publications

First observation of an undular mesospheric bore in a Doppler duct

First observation of an undular mesospheric bore in a Doppler duct

Ultrafast Kelvin waves in the MLT airglow and wind, and their interaction with the atmospheric tides

Planetary wave seasonality from meteor wind measurements at 7.4° S and 22.7° S

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