Fig. 1From: Unseasonal development of post-sunset F-region irregularities over Southeast Asia on 28 July 2014: 1. Forcing from above?The 90th percentile of the hourly S4 index S90 as a function of local time and date throughout July 2014, as detected by a BKK, b BNG, and c CAL GPS stations. Gray cells indicate data gapsBack to article page