Swell systems in Near Real Time from 18-25 January 2008 across the Pacific Ocean as observed by Envisat’s ASAR Wave Mode. Colour indicates wavelength, with red being the longest.
This Envisat image over the North Sea captures numerous aircraft condensation trails, or 'contrails', as well as parts of the Netherlands (upper right), Belgium (lower right) and England (lower left). This image was acquired by Envisat's Medium Resolution Imaging Spectrometer (MERIS) instrument on 21 March 2009, working in Full Resolution mode to provide a spatial resolution of 300 m.
This Envisat image features the Galapagos Islands, an archipelago situated some 1000 km to the west of Ecuador in the Pacific Ocean. Galapagos’s largest island is Isabela (visible). The five volcanoes seen on the island are (from north to south): Wolf Volcano, Darwin Volcano, Alcedo Volcano, Sierra Negra Volcano and Cerro Azul Volcano. The bigger island to the right of Isabela is Santiago Island.
The image was obtained by combining three Advanced Synthetic Aperture Radar (ASAR) acquisitions (23 March 2006, 14 August 2008 and 1 January 2009) taken over the same area. The colours in the image result from variations in the surface that occurred between acquisitions. Apart from mapping changes on the land surface, radar data can also be used to determine sea surface parameters like wind speed, wind direction and wave height. Different wave types and wind speeds are visible in the image as ripples on the water surface.
This animation is comprised of Envisat Advanced Synthetic Aperture Radar (ASAR) mosaics of the Arctic Ocean and highlights the changes in sea ice between June and September 2008. The dark grey colour represents ice-free areas while blue represents areas covered with sea ice.
Ozone hole during 7 October 2008 as measured by the Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) atmospheric sensor onboard ESA’s Envisat.
Envisat captures Cyclone Nargis making its way across the Bay of Bengal just south of Myanmar on 1 May 2008, with its Medium Resolution Imaging Spectrometer (MERIS) instrument working in Reduced Resolution mode to deliver a spatial resolution of 1200 metres.
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