Fig. 4
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40645-018-0184-7/MediaObjects/40645_2018_184_Fig4_HTML.gif)
Longitudinal fluctuations in GAIA temperature averaged over 10 EPB-active days in each period. The periods and timing are a March and April 2003 and 1230 UT and b March and April 2004 and 1230 UT. Temperature perturbation is obtained as a deviation from the zonal 5-point running mean. Solid, dashed, and dotted lines in each panel are data at 4 N, 23 S, and 32 N latitudes, respectively