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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Artificial optical emissions at HAARP for pump frequencies near the third and second electron gyro-harmonic
Annales Geophysicae, Volume 23, No. 5, Year 2005
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Description
High-power high-frequency radio waves beamed into the ionosphere cause plasma turbulence, which can accelerate electrons. These electrons collide with the F-layer neutral oxygen causing artificial optical emissions identical to natural aurora. Pumping at electron gyro-harmonic frequencies has special significance as many phenomena change their character. In particular, artificial optical emissions become strongly reduced for the third and higher gyroharmonics. The High frequency Active Auroral Research Program (HAARP) facility is unique in that it can select a frequency near the second gyro-harmonic. On 25 February 2004, HAARP was operated near the third and passed through the second gyro-harmonic for the first time in a weakening ionosphere. Two novel observations are: firstly, a strong enhancement of the artificial optical emission intensity near the second gyro-harmonic, which is opposite to higher gyro-harmonics; secondly, the optical enhancement maximum occurs for frequencies just above the second gyro-harmonic. We provide the first experimental evidence for these effects, which have been predicted theoretically. In addition, irregular optical structures were created when the pump frequency was above the ionospheric critical frequency. © European Geosciences Union 2005.
Authors & Co-Authors
Kosch, Michael J.
United States, Dayton
Air Force Research Laboratory
United Kingdom, Lancaster
Lancaster University
South Africa, Durban
University of Kwazulu-natal
Pedersen, Todd R.
United States, Dayton
Air Force Research Laboratory
Hughes, J. M.
United States, Fairbanks
University of Alaska Fairbanks
Marshall, Robert A.
United States, Stanford
Star Lab
Gerken, Elizabeth A.
United States, Ithaca
Cornell University
Senior, Andrew
United Kingdom, Lancaster
Lancaster University
Sentman, Davis D.
United States, Fairbanks
University of Alaska Fairbanks
McCarrick, Michael J.
United States, Washington
Advanced Power Technology, Inc.
Djuth, Frank T.
United States, El Segundo
Geospace Research, Inc.
Statistics
Citations: 48
Authors: 9
Affiliations: 8
Identifiers
Doi:
10.5194/angeo-23-1585-2005
ISSN:
09927689
Research Areas
Environmental
Health System And Policy