Preprints
https://doi.org/10.5194/angeo-2021-38
https://doi.org/10.5194/angeo-2021-38

  09 Jul 2021

09 Jul 2021

Review status: this preprint is currently under review for the journal ANGEO.

Influence of the semidiurnal lunar tide on the equatorial plasma bubble zonal drifts over Brazil

Igo Paulino1, Ana Roberta Paulino2, Amauri F. Medeiros1, Cristiano M. Wrasse3, Ricardo A. Buriti1, and Hisao Takahashi3 Igo Paulino et al.
  • 1Unidade Acadêmica de Física, Universidade Federal de Campina Grande, Campina Grande, PB, Brazil
  • 2Departamento de Física, Universidade Estadual da Paraíba, Campina Grande, PB, Brazil
  • 3Divisão de Clima Espacial, Instituto Nacional de Pesquisas Espacias, São José dos Campos, SP, Brazil

Abstract. Using OI6300 airglow images collected over São João do Cariri (7.4° S, 36.5° W) from 2000 to 2007, the equatorial plasma bubble (EPB) zonal drifts were calculated. A strong day-to-day variability was observed in the EPB zonal drifts due to the complexity in the dynamics of the nighttime thermosphere-ionosphere system near the equator. The present work investigated the contribution of the semidiurnal lunar tide M2 for the EPB zonal drifts. On average, the M2 contributes 5.6 % to the variability of the EPB zonal drifts, presenting an amplitude of 3.1 m/s. The results showed that the M2 amplitudes in the EPB zonal drifts were solar cycle and seasonal dependents. The amplitude of the M2 was stronger during the high solar activity reaching over 10 % of the EPB zonal drift average. Regarding the seasons, during the southern hemisphere summer, the M2 amplitude was twice larger (12 %) compared to the equinox ones. The seasonality agrees with other observations of the M2 in the ionospheric parameters such as vertical drifts and electron concentration, for instance. On the other hand, the very large M2 amplitudes found during the high solar activity must be further investigated.

Igo Paulino et al.

Status: open (until 28 Aug 2021)

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Igo Paulino et al.

Igo Paulino et al.

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Short summary
In the present work, the lunar semidiurnal tide (M2) was investigated in the equatorial plasma bubble (EPB) zonal drifts over Brazil from 2000 to 2007. On average, the M2 contributes 5.6 % to the variability of the EPB zonal drifts. It was also observed a strong seasonal and solar cycle dependency, being the amplitudes of the M2 stronger during the summer and high solar activity periods.