Accession Number:

ADA402166

Title:

Investigations of the Nature and Behavior of Plasma-Density Disturbances That May Impact GPS and Other Transionospheric Systems

Descriptive Note:

Scientific rept. no. 1, 10 Sep 1997-31 Aug 1998

Corporate Author:

NORTHWEST RESEARCH ASSOCIATES INC BELLEVUE WA

Report Date:

1998-10-21

Pagination or Media Count:

31.0

Abstract:

As solar maximum approaches, the space-weather vulnerability of systems that depend upon transionospheric radio propagation will increase. Likely effects include variable range errors in the Global Positioning System GPS due to variations in ionospheric total electron content TEC, spatial gradients in such errors, and the scintillation of signals employed in a variety of navigation, communication, and other systems. This report summarizes research performed in the first year of a contract aimed at a investigating the behavior of naturally occurring variations in TEC and the plasma-density irregularities that produce scintillation as solar activity increases, and b observing such phenomena and others that may be produced artificially by means of high-frequency HF heating of the ionosphere in the HF Active Auroral Research Program HAARP. The first-year efforts included collection and processing of TEC data from USAFs Ionospheric Measuring System IMS campaign operation of a portable ionospheric monitor for measurement of TEC and scintillation at Ascension Island preliminary assessment of plasmaspheric contribution to TEC and coordinating development of a variety of diagnostic instruments for HAARP.

Subject Categories:

  • Atmospheric Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE