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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 36, issue 1
Ann. Geophys., 36, 253-264, 2018
https://doi.org/10.5194/angeo-36-253-2018
© 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, 253-264, 2018
https://doi.org/10.5194/angeo-36-253-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Regular paper 27 Feb 2018

Regular paper | 27 Feb 2018

Mesospheric front observations by the OH airglow imager carried out at Ferraz Station on King George Island, Antarctic Peninsula, in 2011

Gabriel Augusto Giongo1,2, José Valentin Bageston1, Paulo Prado Batista3, Cristiano Max Wrasse3, Gabriela Dornelles Bittencourt2, Igo Paulino4, Neusa Maria Paes Leme5, David C. Fritts6, Diego Janches7, Wayne Hocking8, and Nelson Jorge Schuch1 Gabriel Augusto Giongo et al.
  • 1Southern Regional Space Research Center, National Institute for Space Research, Santa Maria – RS, 97105-970, Brazil
  • 2Federal University of Santa Maria, Santa Maria – RS, 97195-000, Brazil
  • 3Aeronomy Division, National Institute for Space Research, São José dos Campos – SP, 12227-010, Brazil
  • 4Federal University of Campina Grande, Campina Grande – PB, 58.429-900, Brazil
  • 5Northern Regional Center, National Institute for Space Research, Natal – RN, 59076-740, Brazil
  • 6Boulder GATS, Inc., Boulder, CO 80301, USA
  • 7Space Weather Laboratory – Goddard Space Flight Center, National Aeronautics and Space Administration, Greenbelt, MD 20771, USA
  • 8University of Western Ontario, London, Ontario, N6A 3K7, Canada

Abstract. The main goals of this work are to characterize and investigate the potential wave sources of four mesospheric fronts identified in the hydroxyl near-infrared (OH-NIR) airglow images, obtained with an all-sky airglow imager installed at Comandante Ferraz Antarctic Station (EACF, as per its Portuguese acronym) located on King George Island in the Antarctic Peninsula. We identified and analyzed four mesospheric fronts in 2011 over King George Island. In addition, we investigate the atmospheric background environment between 80 and 100km altitude and discuss the ducts and propagation conditions for these waves. For that, we used wind data obtained from a meteor radar operated at EACF and temperature data obtained from the TIMED/SABER satellite. The vertical wavenumber squared, m2, was calculated for each of the four waves. Even though no clearly defined duct (indicated by positive values of m2 sandwiched between layers above and below with m2<0) was found in any of the events, favorable propagation conditions for horizontal propagation of the fronts were found in three cases. In the fourth case, the wave front did not find any duct support and it appeared to dissipate near the zenith, transferring energy and momentum to the medium and, consequently, accelerating the wind in the wave propagation direction (near to south) above the OH peak (88–92km). The likely wave sources for these four cases were investigated by using meteorological satellite images and in two cases we could find that strong instabilities were potential sources, i.e., a cyclonic activity and a large convective cloud cell. In the other two cases it was not possible to associate troposphere sources as potential candidates for the generation of such wave fronts observed in the mesosphere and secondary wave sources were attributed to these cases.

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This work presents four events of mesosphere fronts observed on King George Island, Antarctic Peninsula, in the year 2011. The atmospheric background environment was analyzed to investigate the propagation conditions for all cases. To investigate the sources for such cases, satellite images were used. In two cases, we found that strong tropospheric instabilities were potential sources, and in the other two cases, it was not possible to associate them with tropospheric sources.
This work presents four events of mesosphere fronts observed on King George Island, Antarctic...
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