Fig. 4From: Sporadic E morphology based on COSMIC radio occultation data and its relationship with wind shear theoryMonthly variations of the global distribution of the Es layer occurrence rates binned with a grid of 2° × 2° during the period from January 2007 to December 2015. Panels a–l represent 12 different months, and the red and the black curves, respectively, represent the magnetic inclination contoursBack to article page