Fig. 1From: Extraordinary quasi-16-day wave activity from October 2013 to January 2014 with radar observations at mid-latitudes and MERRA2 reanalysis dataMonthly mean a, c zonal and b, d meridional winds at 76–100 km between October 2010 and September 2017 derived from meteor radar observations at a, b Beijing and c, d Wuhan. The blank spaces indicate the acceptance data rate less than 60% within a monthBack to article page