Japan Geoscience Union Meeting 2014

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Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM36_28AM1] Physics and Chemistry in the Atmosphere and Ionosphere

Mon. Apr 28, 2014 9:00 AM - 10:45 AM 312 (3F)

Convener:*Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University), Takuya Tsugawa(National Institute of Information and Communications Technology), Seiji Kawamura(National Institute of Information and Communications Technology), Chair:Atsuki Shinbori(Research Institute for Sustainable Humanosphere (RISH), Kyoto University), Seiji Kawamura(National Institute of Information and Communications Technology)

9:45 AM - 10:00 AM

[PEM36-04] Relationship between solar activity and disturbance in the middle atmosphere during Arctic winter

*Kazuyo SAKANOI1, Takenari KINOSHITA2, Yasuhiro MURAYAMA2 (1.Komazawa Univ., 2.National Institude of Information and Communications Technology)

Keywords:Middle atmosphere disturbance, Solar activity, Arctic Oscillation, QBO, Arctic region, Stratospheric sudden warming

Purpose of this research is to clarify relationship between solar activity and disturbance in the middle atmosphere during Arctic winter. In this research we consider stratospheric sudden warming (SSW), which is typical phenomenon in Arctic winter, as disturbance in the middle atmosphere including the mesosphere. Previous research reported effect of 11-year solar cycle on thermal structure only in the Stratosphere. To get thing started, we selected daily bottom altitude of easterly wind area, which corresponds to SSW, in the zonal mean horizontal wind. Averaged value of those during one SSW event is used for quantitative comparison with solar activity and QBO index. No clear relationship was found between the selected new value (ZEW index) and two indexes. However we confirm that the ZEW index represents well the degree of disturbance. Next, we calculate AO index in the altitude range from 1000 hPa to 0.1 hPa (65km alt). AO index also represents the degree of disturbance. In this presentation, we will examine and discuss in more detail about ZEW and AO index as those which indicate the degree of disturbance in the middle atmosphere for quantitative comparison with solar activity.