Press Release

Nighttime Clouds Excite Sky Watchers

By SpaceRef Editor
July 1, 2003
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A NASA project to study the ionosphere using man-made nighttime clouds
excited sky watchers in the mid-Atlantic and lower northeastern United
States on Sunday night.

Four rockets were launched Sunday night and Monday morning from the NASA
Wallops Flight Facility in Virginia. Three of the rockets released
trimethylaluminum, a substance in space that formed milky-white clouds,
allowing scientists to monitor winds in the ionosphere, a high and poorly
accessible layer of Earth’s atmosphere.

Observers in North Carolina, Virginia, Maryland, Delaware, New Jersey, New
York and Pennsylvania reported seeing the clouds that remained visible for
up to 20 minutes after forming.

The clouds allow scientists to monitor the Earth’s winds at the edge of
space, said Dr. Gregory Earle from the University of Texas in Dallas, the
lead researcher for the project. “The clouds act as a tracer and allow
researchers to view the winds at various altitudes over a period of time,”
he said.

The ionosphere is strongly affected by solar activity, such as solar flares
and ultraviolet radiation. The state of the ionosphere affects such things
as radio communications and Global Positioning System reception on Earth.

Earle said, ” The data gathered from this project will aid in our
understanding of the relationship between the winds and ionospheric activity.”

The rockets were launched between 11:19 p.m., Sunday, June 29 and 3:07
a.m., Monday, June 30. All four rockets and experiment systems performed
as planned.

SpaceRef staff editor.