RADARSAT-1 ScanSAR Wide B image, band-pass filtered to highlight atmospheric IGW signatures in the vicinity of a warm front. For more information, see Swales, D. J., G. S. Young, T. D. Sikora, N. S. Winstead, and H. N. Shirer, 2012:  Synthetic aperture radar remote sensing of shear-driven atmospheric internal gravity waves in the vicinity of a warm front.  Mon. Wea. Rev., 140, 1872-1882.