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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 31, issue 3
Ann. Geophys., 31, 409–418, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 31, 409–418, 2013
© Author(s) 2013. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 05 Mar 2013

Regular paper | 05 Mar 2013

Investigation of a mesospheric bore event over northern China

Q. Li1,2, J. Xu1, J. Yue3, X. Liu1,4, W. Yuan1, B. Ning5, S. Guan1,2, and J. P. Younger6,7 Q. Li et al.
  • 1State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Hampton University, Hampton, VA, USA
  • 4College of Mathematics and Information Science, Henan Normal University, Xinxiang, China
  • 5Beijing National Observatory of Space Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
  • 6School of Chemistry and Physics, University of Adelaide, Adelaide, South Australia, Australia
  • 7ATRAD Pty Ltd., Thebarton, South Australia, Australia

Abstract. A mesospheric bore event was observed using an OH all-sky airglow imager (ASAI) at Xinglong (40.2° N, 117.4° E), in northern China, on the night of 8–9 January 2011. Simultaneous observations by a Doppler meteor radar, a broadband sodium lidar, and TIMED/SABER OH intensity and temperature measurements are used to investigate the characteristics and environment of the bore propagation and the possible relations with the Na density perturbations. The bore propagated from northeast to southwest and divided the sky into bright and dark halves. The calculations show that the bore has an average phase velocity of 68 m s−1. The crests following the bore have a horizontal wavelength of ~ 22 km. These parameters are consistent with the hydraulic jump theory proposed by Dewan and Picard, as well as the previous bore reports. Simultaneous wind measurements from the Doppler meteor radar at Shisanling (40.3° N, 116.2° E) and temperature data from SABER on board the TIMED satellite are used to characterize the propagating environment of the bore. The result shows that a thermal-Doppler duct exists near the OH layer that supports the horizontal propagation of the bore. Simultaneous Na lidar observations at Yanqing (40.4° N, 116.0° E) suggest that there is a downward displacement of Na density during the passage of the mesospheric bore event.

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