Fig. 3From: A quasi-27-day oscillation activity from the troposphere to the mesosphere and lower thermosphere at low latitudesWavelet spectrum of zonal wind at 100Â km for 1Â year from 13 April 2006 to 12 April 2007. The months are marked on the last day of each month. The two dashed vertical lines are marked on 12 August 2006 and 31 October 2006, respectivelyBack to article page