New Findings Relating Tidal Variability and Solar Activity in the Low Latitude MLT Region

Mesospheric winds have been measured by meteor radar at Cachoeira Paulista (22.7°S; 45°W) since April 1999. The tidal components were analyzed over about 21 years of available data exhibiting an annual and semi‐annual variation. Amplitudes of meridional diurnal (semidiurnal) tide are on averaged 30%...

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Bibliographic Details
Published in:Journal of geophysical research. Space physics 2022-03, Vol.127 (3), p.n/a
Main Authors: Andrioli, V. F., Xu, J., Batista, P. P., Resende, L. C. A., Da Silva, L. A., Marchezi, J. P., Li, H., Wang, C., Liu, Z., Guharay, A.
Format: Article
Language:English
Subjects:
Amplitudes
Annual variations
Diurnal variations
Electron precipitation
Mesospheric winds
meteor winds
Particle precipitation
Radar
Semiannual oscillation
Semidiurnal tides
Solar activity
Solar cycle
Solar flux
Solar maximum
Solar minimum
Solar oscillations
solar wind HSS
Tidal amplitude
tidal variability
Tidal winds
Wind variations
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Summary:Mesospheric winds have been measured by meteor radar at Cachoeira Paulista (22.7°S; 45°W) since April 1999. The tidal components were analyzed over about 21 years of available data exhibiting an annual and semi‐annual variation. Amplitudes of meridional diurnal (semidiurnal) tide are on averaged 30% (28%) and the zonal ones are 14% (20%) stronger at solar minimum than at solar maximum. The anticorrelation between F10.7 cm solar flux and amplitudes of the semiannual oscillation of diurnal and semidiurnal tides is presented. Additionally, the sporadic E (Es) layers occurrence has an anti‐correlation with solar activity due to the tidal wind variation. A discussion about the physical mechanism is performed in terms of the particle precipitation during High‐Speed Stream (HSS) events according to the solar cycle. Finally, a superposed epoch analysis of the tidal amplitudes during the HSS events in 2018 is presented. And a slight increase in all tidal components is seen when the structure reached the Earth and in the following days showing that indeed the electron precipitation during HSS events affect the tidal amplitudes. Key Points Anticorrelation between tidal winds and solar cycle activity Anticorrelation between sporadic E (Es) layer occurrence and solar cycle Evidence of solar wind high speed streams influence in the mesosphere lower thermosphere (MLT) region winds
ISSN:2169-9380
2169-9402
DOI:10.1029/2021JA030239