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Keith Koehler                                            July 1, 2003
Wallops Flight Facility, Va.
(Phone: 757/824-1579)

Release:  03-69

NIGHTTIME CLOUDS EXCITE SKY WATCHERS

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.

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