Journal cover Journal topic
Annales Geophysicae An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

Journal metrics

  • IF value: 1.585 IF 1.585
  • IF 5-year value: 1.698 IF 5-year
    1.698
  • CiteScore value: 1.62 CiteScore
    1.62
  • SNIP value: 0.820 SNIP 0.820
  • IPP value: 1.52 IPP 1.52
  • SJR value: 0.781 SJR 0.781
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 83 Scimago H
    index 83
  • h5-index value: 24 h5-index 24
Volume 30, issue 4
Ann. Geophys., 30, 703–710, 2012
https://doi.org/10.5194/angeo-30-703-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 703–710, 2012
https://doi.org/10.5194/angeo-30-703-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

ANGEO Communicates 19 Apr 2012

ANGEO Communicates | 19 Apr 2012

A remarkable correlation between short period gravity waves and semiannual oscillation of the zonal wind in the equatorial mesopause region

N. Venkateswara Rao1, T. Tsuda1, and Y. Kawatani2 N. Venkateswara Rao et al.
  • 1Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Japan
  • 2Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan

Abstract. The variability of zonal winds and the horizontal wind velocity variance of short period (20–120 min) gravity waves (GWs) in the equatorial mesopause region are studied using medium frequency (MF) radar observations from Pameungpeuk (7.4° S, 107.4° E) during 2004–2010. The zonal winds display a distinct semiannual oscillation (called mesospheric semiannual oscillation, MSAO), with westward winds during equinoxes and eastward winds during solstices. Furthermore, the westward winds during March equinox are larger during 2008 and 2009. The short period GW variance also shows a semiannual oscillation with enhanced activity during equinoxes. A good correlation is observed between the zonal winds and the short period GW variance from 2008–2010, with the winds being westward during the times of enhanced GW activity. Such a correlation, however, is less obvious during 2004–2006. The long period (10–20 h) GW variance, on the other hand, does not show such a correlation throughout the observation period.

Publications Copernicus
Download
Citation