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Earth, Planets and Space
Figure 4 | Earth, Planets and Space

Figure 4

From: Global distribution of the migrating terdiurnal tide seen in sporadic E occurrence frequencies obtained from GPS radio occultations

Figure 4

Six-year averages of the normalised amplitude of the 8-h E S for each season. The results show 3-monthly mean zonal means for winter (December to February, top left), spring (March to May, top right), summer (June to August, bottom left) and autumn (September to November, bottom right), derived from the FORMOSAT-3/COSMIC satellites measurements from December 2006 to November 2012. Reddish areas show regions with an occurrence frequency of sporadic E layers >30/1,000.

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