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Wed, Nov 03, 2004

NOAA Offers New Experimental Ionospheric Products

Aimed At Making GPS More Accurate

NOAA's Space Environment Center and National Geodetic Survey Tuesday released new experimental ionosphere products to help emergency managers and other users quickly assess the effects of solar storm on Global Positioning System applications.

The SEC has created a near real-time ionospheric specification map of total electron content (TEC) over the continental United States that updates every 15 minutes.

The USTEC map, available online, will aid users affected by ionospheric conditions -- GPS applications, surveyors, emergency managers, and others -- to quickly assess the current situation that may impact their systems.

The ionosphere is the area of the Earth's atmosphere beginning at an altitude of about 30 miles and extending upwards to 10,000 miles. Free electrons slow and disrupt the GPS signal as it passes through the ionosphere.

"This map is the initial offering in an ongoing effort to provide improved products and services to a significant part of the SEC users community," said Ernest Hildner, director of NOAA's Space Environment Center in Boulder (CO).

This product results from contributions of the National Geodetic Survey, National Geophysical Data Center, Forecast Systems Lab, and the Cooperative Institute for Research in the Environmental Sciences (CIRES) at the University of Colorado.

The NGS also announce two new ionosphere models over the continental United States. These two highly accurate models (MAGIC and ICON-1) use the full set of Continuously Operating Reference Stations (CORS) and provide ionospheric information between CORS stations and GPS satellites with a three-day delay. Thanks to these models, users will be able to more precisely compute positions from GPS.

Both MAGIC and ICON-1 are prototype models, part of ongoing research projects, but are being made available free to the general public for testing and evaluation purposes.

FMI: www.ngdc.noaa.gov/stp/IONO/, www.noaa.gov, www.sec.noaa.gov/ustec

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