A Multi-Instrument Measurement of a Mesospheric Front-Like Structure at the Equator(<Special Issue>CPEA-Coupling Processes in the Equatorial Atmosphere)

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概要

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• We have made a comprehensive measurement of a front-like structure in the mesosphere at the equator at Kototabang, Indonesia (0.2°S, 100.3°E), using an airglow imager, an airglow temperature photometer, a meteor radar, and the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) instrument on board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite. The event was detected in airglow images of both OH-band (peak emission altitude: 87km) and 557.7-nm (96-km) emissions, as an east-west front-like structure propagating northward with a velocity of 52-58m/s. Wave trains with a horizontal wavelength of 30-70km were observed after the passage of the front. The airglow intensity decreased for all the mesospheric emissions of OI (557.7nm), OH-band, O_2-band (altitude: 94km), and Na (589.3nm) (90km) after the front passage. The rotational temperatures of both the OH-band and the O_2-band also decreased 〜10K. An intense shear in northward wind velocity of 80m/s/6km was observed at altitudes of 84-90km by the meteor radar. The kinetic temperature profile at altitudes of 20-120km was observed near Kototabang by TIMED/SABER. The front-like structure and trailing waves were similar to those of the mesospheric tidal bore. However, we found that the ducting condition, which is necessary to form a bore, was not satisfied for the observed wave parameters. We speculate that the intense wind shear may play some role for the generation of the front-like structure.

• 社団法人日本気象学会の論文
• 2006-07-14

著者

• Shiokawa Kazuo

  Solar-Terrestrial Environmental Laboratory, Nagoya University

• Nakamura Takuji

  Research Institute for Sustainable Humanosphere, Kyoto University

• 小川 忠彦

  Solar-terrestrial Environment Laboratory Nagoya University

• Otsuka Yuichi

  Solar-terrestrial Environment Laboratory Nagoya University

• Ogawa Tadahiko

  Solar-Terrestrial Environment Laboratory,Nagoya University

• SUZUKI Shin

  Solar-Terrestrial Environment Laboratory, Nagoya University

• MLYNCZAK Martin

  Climate Science Branch, NASA Langley Research Center

• RUSSELL III

  Department of Physics, Hampton University

• Ogawa Toshio

  Faculty Of Engineering Toyama Prefectural University

• Ogawa Tadahiko

  Faculty Of Engineering Toyama Prefectural University

• Russell Iii

  Department Of Physics Hampton University

• Nakamura Takuji

  Research Institute For Sustainable Humanosphere (rish) Kyoto University

• Ogawa Tadahiko

  Solar-terrestrial Environment Laboratory Nagoya University

• Shiokawa Kazuo

  Solar-terrestrial Environmental Laboratory Nagoya University

• Shiokawa Kazuo

  Solar Terrestrial Environment Laboratory Nagoya University

• Mlynczak Martin

  Climate Science Branch Nasa Langley Research Center

• Suzuki Shin

  Solar-terrestrial Environment Laboratory Nagoya University

• Otsuka Yuichi

  Nagoya Univ. Nagoya Jpn

• Ogawa Toshio

  Solar-terrestrial Environment Laboratory Nagoya University

• Otsuka Yuichi

  Solar-Terrestrial Environment Laboratory, Nagoya University

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