H/T to Keith Stein @
www.examiner.com
NASA Rocket Experiment Visible In D.C. Skies
September 10, 2009 12:35
A rocket experiment launched from NASA?s Wallops Flight Facility in
Virginia will be visible in the D.C. area Tuesday night, weather permitting.
The Naval Research Laboratory (NRL) and the Department of Defense
Space Test Program will use a NASA four-stage Black Brant rocket to
conduct the experiment named Charged Aerosol Release Experiment
(CARE). Using ground based instruments and Earth orbiting spacecraft,
scientists will study an artificial noctilucent cloud formed by the exhaust
particles of the rocket's fourth stage 62 miles above Earth.
The launch is scheduled between 7:30 and 7:57 p.m. EDT. The backup
launch days are Sept. 16 through Sept. 20. The rocket flight and the
resulting cloud may be seen throughout the mid-Atlantic region. The
artificial noctilucent cloud also may be visible the following morning just
before sunrise.
Ground based cameras and radars will be based at various observation
stations along the Atlantic coast and in Bermuda. Because of the optical
observations, the launch will require clear skies not only at Wallops but
also at the multiple observation stations.
Science instruments aboard the STPSat-1 spacecraft in Earth orbit will
track the CARE dust cloud for days or even months. The spacecraft has
previously viewed natural noctilucent clouds for the past two years. The
CARE will be the first space viewing of an artificial noctilucent cloud.
Data collected during the experiment will provide insight into the
formation, evolution, and properties of noctilucent clouds, which are
typically observed naturally at high latitudes. In addition to the
understanding of noctilucent clouds, scientists will use the experiment to
validate and develop simulation models that predict the distribution of
dust particles from rocket motors in the upper atmosphere.
Natural noctilucent clouds, also known as polar mesospheric clouds, are
found in the upper atmosphere as spectacular displays that are most
easily seen just after sunset. The clouds are the highest clouds in Earth's
atmosphere, located in the mesosphere around 50 miles altitude.
They are normally too faint to be seen with the naked eye and are visible
only when illuminated by sunlight from below the horizon while the
Earth's surface is in darkness.
A team of government agencies and universities, led by the NRL, is
conducting the experiment. Participants include the University of
Michigan, Air Force Research Laboratory, Clemson University, Stanford
University, University of Colorado, Penn State University and
Massachusetts Institute of Technology/Haystack Observatory.
http://www.examiner.com/x-5429-DC-Space ... n-DC-skies