NASA Scientist Confirms Light Show on Venus

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DC Agle 818-393-9011
Jet Propulsion Laboratory, Pasadena, Calif.
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Dwayne Brown 202-358-1726
NASA Headquarters, Washington
dwayne.c.brown@nasa.gov

Monica Talevi 011-31-71-565-3223
European Space Agency, Noordwijk, The Netherlands.
monica.talevi@esa.int

NEWS RELEASE: 2007-137 Nov. 28, 2007

NASA Scientist Confirms Light Show on Venus

Venus is a hellish place of high temperatures and crushing air pressure. The European
Space Agency's Venus Express mission adds into this mix the first confirmation that the
Venusian atmosphere generates its own lightning. The discovery is part of the Venus
Express science findings that appear in a special section of the Nov. 29 issue of the
journal Nature.

"In addition to all the pressure and heat, we can confirm there is lightning on Venus --
maybe even more activity than there is here on Earth," said Christopher Russell, a
NASA-sponsored scientist on Venus Express from the University of California, Los
Angeles, and lead author of one of the Nature papers. "Not a very good place to vacation,
that is for sure."

The discovery puts Venus in elite planetary company. Scientists currently know of only
three other planetary bodies in the entire universe that generate lightning -- Earth, Jupiter
and Saturn. Lightning on Venus -- as well as on any other planet -- is an important
discovery because the electrical discharges drive the chemistry of an atmosphere by
breaking molecules into fragments that can then join with other fragments in unexpected
ways. The lightning on Venus is unique from that found on Earth, Jupiter and Saturn in
that it is the only lightning known that is not associated with water clouds. Instead, on
Venus, the lightning is associated with clouds of sulfuric acid.

Any future missions to the second rock from the sun may have to take into account the
electrical activity in the Venusian atmosphere.

The confirming measurements of the electrical discharges were made with data obtained
by the Venus Express magnetometer instrument provided by the Space Research Institute
in Graz, Austria. The measurements were taken once a day for two minutes, during a
period when the spacecraft was closest to Venus. A Venusian day is about 117 days long.

With its primary mission completed, Venus Express will now embark upon its extended
mission to watch Earth's nearest planetary neighbor for two more Venusian days. Among
other things, it will look for the telltale infrared radiation from lava flows. In 2010, when
a Japanese mission, Venus Climate Orbiter, also called Planet-C, arrives at Venus,
scientists will be able to compare results from the two spacecraft.

More than 250 scientists and engineers across Europe are involved in the Venus Express
mission, supported by their institutes and national space agencies. The mission also sees
the contribution of scientists from Russia and Japan, as well as from NASA, which
sponsors 15 American Venus Express scientists and provides support to the radio science
investigation via its Deep Space Network antennas.

Related images and graphics are online at www.esa.int/venus .
For information about NASA's contribution to Venus Express, visit

http://www.venus.wisc.edu/index.html . For information about NASA and agency
programs, visit http://www.nasa.gov .

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