Earth from space: Irene's eye

Sep 02, 2011
This animation, comprised of two images taken simultaneously at 11:15 local time (15:15 GMT) on Aug. 27, 2011, with different Envisat sensors, shows Hurricane Irene, which struck the US east coast at the end of August. The first black and white radar image provides an unusual view of a hurricane as it shows the rough ocean surface through the clouds. In the centre of the image, a dark spot can be seen where the eye of the hurricane passed over North Carolina’s Outer Banks. This area of serene weather at the center of the hurricane was visible to the radar because calm water provided a smooth surface, appearing darker. The second image is from Envisat’s MERIS instrument and shows the typical spiral cloud pattern of the hurricane. Credit: ESA

This week we look at two images taken simultaneously with different Envisat sensors of Hurricane Irene, which struck the US east coast last week.

The first black and white image is from Envisat's radar, covering the of North Carolina, Virginia, Maryland and Delaware.

The radar provides an unusual view of a hurricane as it shows the rough through the clouds.

In the centre of the image, a dark spot can be seen where the eye of the hurricane passed over North Carolina's Outer Banks. This area of serene weather at the centre of the hurricane was visible to the radar because calm water provided a smooth surface, appearing darker.

The pattern of the hurricane over the Atlantic Ocean is evident: bright areas correspond to rough seas while the darker areas depict calmer waters. Dark areas may also be caused by heavy rainfall that reduces the radar signal.

The second image is from Envisat's MERIS instrument and shows the typical spiral of the hurricane.

The two images were captured at 11:15 local time (15:15 GMT) on 27 August. wreaked havoc along the coast as it continued north, leaving dozens of people dead and causing billions of dollars in damage.

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