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Erythemal Index for August 2000 through July 2001: Zoom to North America (With Dates)
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.

A global view of the Earth, gradually zooming into North America covered in purples (to the North) and blues (to the South), denoting low levels of ground level ultraviolet radiation in August, 2000. This animation shows the fluctuation in the levels through the year. By January, 2001, the red showing high levels of ground level ultraviolet radiation creep in and then fade away. The data covers August, 2000 through July, 2001.    A global view of the Earth, gradually zooming into North America covered in purples (to the North) and blues (to the South), denoting low levels of ground level ultraviolet radiation in August, 2000. This animation shows the fluctuation in the levels through the year. By January, 2001, the red showing high levels of ground level ultraviolet radiation creep in and then fade away. The data covers August, 2000 through July, 2001.
Duration: 12.0 seconds
Available formats:
  320x240 (30 fps) MPEG-1   1 MB
  160x80       PNG           29 KB
  80x40         PNG           8 KB
  320x240     JPEG         7 KB
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Animation Number:2218
Animator:Michael Mangos (Lead)
Studio:SVS
Completed:2001-06-25
Scientist:Richard McPeters (NASA/GSFC)
Instrument:Earth Probe/TOMS
Data Collected:2000/08/01-2001/07/31
Series:Erythemal UV
Video:SVS2001-0020 *
Keywords:
DLESE >> Atmospheric science
SVS >> UV
 
 
Please give credit for this visualization to
NASA/Goddard Space Flight Center
Scientific Visualization Studio


*Please note: the SVS does not fulfill requests for copies of the tapes in our library. On some of our animation pages, there is a direct link to a video distribution service from which tapes, handled by the Public Affairs Office (PAO)/Goddard TV, including some of our animations may be ordered. General information on this service can be found here.


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