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Discussion papers | Copyright
© Author(s) 2018. This work is distributed under
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Research article 14 May 2018

Research article | 14 May 2018

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This discussion paper is a preprint. A revision of the manuscript is under review for the journal Atmospheric Chemistry and Physics (ACP).

Undulating wave front of mesospheric bore; Space-borne observations by ISS-IMAP/VISI

Yuta Hozumi1, Akinori Saito2, Takeshi Sakanoi3, Atsushi Yamazaki4, and Keisuke Hosokawa1 Yuta Hozumi et al.
  • 1Department of Information and Communication Engineering, University of Electro-Communications, Tokyo, Japan
  • 2Graduate School of Science, Kyoto University, Kyoto, Japan
  • 3Planetary Plasma and Atmospheric Research Center, Tohoku University, Sendai, Japan
  • 4Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Japan

Abstract. Large-scale spatial structures of mesospheric bores were observed by Visible and near Infrared Spectral Imager (VISI) of the ISS-IMAP mission (Ionosphere, Mesosphere, upper Atmosphere and Plasmasphere mapping mission from the International Space Station) in the mesospheric O2 airglow at 762nm wavelength. Two mesospheric bore events are reported in this paper; one event was observed over the south of African continent (48°S–54°S and 10°E–25°E) on 9 July 2015, and the other event over the south Atlantic Ocean (35°S–43°S and 24°W–1°E) on 7 May 2013. For the first event, the temporal evolution of the mesospheric bore was investigated from the difference of two observations in consecutive paths. The estimated eastward speed of the bore is 100m/sec. The number of trailing waves increased with a rate of 3.5wave/hour. Anti-clockwise rotation with a speed of 20º/hour was also recognized. These parameters are similar to those reported by previous studies based on ground-based measurements, and the similarity supports the validity of VISI observation for mesospheric bores. For the second event, VISI captured a mesopshric bore having a large-scale and undulating wave front. The horizontal extent of the wave front was 2,200km. The long wave front undulated with 1,000km wave length. The undulating wave front is a new feature of mesospheric bore revealed by the wide FOV of VISI. We suggest that non-uniform bore propagating speed due to inhomogeneous background ducting structure might be a cause of the undulation of the wave front. Temperature measurements from the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) of the Thermosphere, Ionosphere, Mesosphere, Energetics and Dynamics (TIMED) satellite indicated that bores of both events were ducted in a temperature inversion layer.

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Short summary
Spatial structures of wave disturbances in the upper atmosphere were investigated with space-borne imaging from the International Space Station. The wave disturbance occurred around an altitude of 100 km, and called a mesospheric bore. Large-scale structures of mesospheric bore have not been fully captured by previous ground-based imagers, but the space-borne imaging captured a bore with a wide field of view, and showed that bore can have large undulating wave front as long as 2,000 km.
Spatial structures of wave disturbances in the upper atmosphere were investigated with...