Fig. 6From: Unseasonal development of post-sunset F-region irregularities over Southeast Asia on 28 July 2014: 1. Forcing from above?The hourly average of h’F versus local time throughout July 2014 (black, error bars indicate ± 1 standard deviation) and the h’F versus local time for 27 (yellow), 28 (red), and 29 (blue) July 2014, as measured by the BCL ionosonde. The horiztonal bar indicates the presence of spread F on 28 JulyBack to article page