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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 2
Ann. Geophys., 36, 311-319, 2018
https://doi.org/10.5194/angeo-36-311-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: Space weather connections to near-Earth space and the...

Ann. Geophys., 36, 311-319, 2018
https://doi.org/10.5194/angeo-36-311-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 05 Mar 2018

Regular paper | 05 Mar 2018

Case study of mesospheric front dissipation observed over the northeast of Brazil

Amauri Fragoso Medeiros1, Igo Paulino1, Cristiano Max Wrasse2, Joaquim Fechine1, Hisao Takahashi2, José Valentin Bageston3, Ana Roberta Paulino1,4, and Ricardo Arlen Buriti1 Amauri Fragoso Medeiros et al.
  • 1Universidade Federal de Campina Grande, Campina Grande, PB, Brazil
  • 2Instituto Nacional de Pesquisas Espaciais, São José dos Campos, SP, Brazil
  • 3Centro Regional Sul de Pesquisas Espaciais, Instituto Nacional de Pesquisas Espaciais, Santa Maria, RS, Brazil
  • 4Universidade Estadual da Paraíba, Campina Grande, PB, Brazil

Abstract. On 3 October 2005 a mesospheric front was observed over São João do Cariri (7.4°S, 36.5°W). This front propagated to the northeast and appeared in the airglow images on the west side of the observatory. By about 1.5 h later, it dissipated completely when the front crossed the local zenith. Ahead of the front, several ripple structures appeared during the dissipative process of the front. Using coincident temperature profile from the TIMED/SABER satellite and wind profiles from a meteor radar at São João do Cariri, the background of the atmosphere was investigated in detail. On the one hand, it was noted that a strong vertical wind shear in the propagation direction of the front produced by a semidiunal thermal tide was mainly responsible for the formation of duct (Doppler duct), in which the front propagated up to the zenith of the images. On the other hand, the evolution of the Richardson number as well as the appearance of ripples ahead of the main front suggested that a presence of instability in the airglow layer that did not allow the propagation of the front to the other side of the local zenith.

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On 3 October 2005, a mesospheric front was observed over São João do Cariri (7.4° S, 36.5° W) propagating to the northeast in the OH airglow images. One and a half hours later, it disappeared completely and ripples were observed in the eastern part of the images. After studying the background atmosphere, the main conclusion of this work was that the instability in the airglow layer did not allow the propagation of the front to the other side of the local zenith.
On 3 October 2005, a mesospheric front was observed over São João do Cariri (7.4° S, 36.5° W)...
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