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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 34, issue 1
Ann. Geophys., 34, 91–96, 2016
https://doi.org/10.5194/angeo-34-91-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 34, 91–96, 2016
https://doi.org/10.5194/angeo-34-91-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 22 Jan 2016

Regular paper | 22 Jan 2016

Twin mesospheric bores observed over Brazilian equatorial region

A. F. Medeiros1, I. Paulino1, M. J. Taylor2, J. Fechine1, H. Takahashi3, R. A. Buriti1, L. M. Lima4, and C. M. Wrasse3 A. F. Medeiros et al.
  • 1Universidade Federal de Campina Grande, Campina Grande/PB, Brazil
  • 2Utah State University, Logan, UT 84322-4405, USA
  • 3Instituto Nacional de Pesquisas Espaciais, São José dos Campos/SP, Brazil
  • 4Universidade Estadual da Paraíba, Campina Grande/PB, Brazil

Abstract. Two consecutive mesospheric bores were observed simultaneously by two all-sky cameras on 19 December 2006. The observations were carried out in the northeast of Brazil at two different stations: São João do Cariri (36.5° W, 7.4° S) and Monteiro (37.1° W, 7.9° S), which are by about 85 km apart. The mesospheric bores were observed within an interval of  ∼  3 h in the NIR OH and OI557.7 nm airglow emissions. Both bores propagated to the east and showed similar characteristics. However, the first one exhibited a dark leading front with several trailing waves behind and progressed into a brighter airglow region, while the second bore, observed in the OH layer, was comprised of several bright waves propagating into a darker airglow region. This is the first paper to report events like these, called twin mesospheric bores. The background of the atmosphere during the occurrence of these events was studied by considering the temperature profiles from the TIMED/SABER satellite and wind from a meteor radar.

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This paper reports two consecutive mesospheric bores observed in the airglow emissions (OH and OI5577). Both bores propagated to the east and showed similar spectral characteristics. However, the first one exhibited a dark leading front with several trailing waves behind and progressed into a brighter airglow region. However, the second bore, observed in the OH layer, was comprised of several bright waves propagating into a darker airglow region.
This paper reports two consecutive mesospheric bores observed in the airglow emissions (OH and...
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