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Daily Erythemal Index over the United States for July 2001
The Erythemal Index is a measure of ultraviolet radiation (UV) at ground level on the Earth. UV exists to the left of the visible spectrum and is divided into three components (UV-A, UV-B and UV-C). UV-B (290-320 wavelengths) is the most dangerous form of UV radiation that can reach ground level. Atmospheric ozone shields life at the surface from most of the harmful components of solar radiation. Chemical processes in the atmosphere can effect the level of protection provided by the ozone in the upper atmosphere. This thinning of the atmospheric ozone in the stratosphere leads to elevated levels of UV-B at ground level and increases the risks of DNA damage in living organisms.

View of the United States with red (showing high levels of ground level ultraviolet radiation) covering the Western US and then changing to splotchy yellows, greens and blues as you move East (denoting lower levels of ground level ultraviolet radiation). Daily data is presented for July 1, 2001 through August 2, 2001.    View of the United States with red (showing high levels of ground level ultraviolet radiation) covering the Western US and then changing to splotchy yellows, greens and blues as you move East (denoting lower levels of ground level ultraviolet radiation). Daily data is presented for July 1, 2001 through August 2, 2001.
Duration: 4.0 seconds
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August 1, 2001    August 1, 2001

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August 2, 2001    August 2, 2001

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July 1, 2001    July 1, 2001

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July 2, 2001    July 2, 2001

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July 3, 2001    July 3, 2001

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July 1, 2001    July 1, 2001

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July 5, 2001    July 5, 2001

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July 6, 2001    July 6, 2001

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July 7, 2001    July 7, 2001

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July 8, 2001    July 8, 2001

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July 9, 2001    July 9, 2001

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July 10, 2001    July 10, 2001

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July 11, 2001    July 11, 2001

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July 12, 2001    July 12, 2001

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July 16, 2001    July 16, 2001

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July 27, 2001    July 27, 2001

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July 28, 2001    July 28, 2001

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July 29, 2001    July 29, 2001

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July 30, 2001    July 30, 2001

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July 31, 2001    July 31, 2001

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Animation Number:2216
Completed:2001-08-08
Animator:Michael Mangos (GST) (Lead)
Scientist:Richard McPeters (NASA/GSFC)
Platform/Sensor/Data Set:Earth Probe/TOMS (2001/07/01-2001/08/02)
Series:Erythemal UV
Video:SVS2001-0020 *
Keywords:
DLESE >> Atmospheric science
SVS >> Erythemal
SVS >> Solar Radiation
SVS >> UV
SVS >> UV-B
SVS >> Ultraviolet
 
 
Please give credit for this item to:
NASA/Goddard Space Flight Center
Scientific Visualization Studio


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