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Using a radio occultation technique, scientists are able to use
signals broadcast from Global Positioning System (GPS) satellites to
retrieve profiles of bending angles, refractivity, temperature,
pressure, and water vapor in the atmosphere. Also, profiles of
electron density in the ionosphere. Such data are gathered and
processed at the Constellation Observing System for Meteorology,
Ionosphere, Climate (COSMIC) Data Analysis and Archive Center
(CDAAC) in Boulder, Colorado. Various products are produced
including atmospheric profiles starting from near Earth's surface to
the height of the satellites at 800 kilometers (500 miles) above the
Earth surface. At this time only atmospheric profiles of bending
angle, refractivity, and dry temperature are available. As we
receive more data this archive will continue to expand to include
more variable profiles.
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