Accession Number : ADA545439


Title :   Creation of Artificial Ionospheric Layers Using High-Power HF Waves


Descriptive Note : Journal article


Corporate Author : AIR FORCE RESEARCH LAB HANSCOM AFB MA SPACE VEHICLES DIRECTORATE


Personal Author(s) : Pedersen, T ; Gustavsson, B ; Mishin, E ; Kendall, E ; Mills, T ; Carlson, H C ; Snyder, A L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a545439.pdf


Report Date : 30 Jan 2010


Pagination or Media Count : 5


Abstract : We report the first evidence of artificial ionospheric plasmas reaching sufficient density to sustain interaction with a high-power HF pump beam produced by the 3.6 MW High-Frequency Active Auroral Program (HAARP) transmitter in Gakona, Alaska. The HF-driven ionization process is initiated near the 2nd electron gyroharmonic at 220 km altitude in the ionospheric F region. Once the artificial plasma reaches sufficient density to support interaction with the transmitter beam it rapidly descends as an ionization wave to approximately 150 km altitude. Although these initial artificial layers appear to be dynamic and highly structured, this new ability to produce significant artificial plasma in the upper atmosphere opens the door to a new regime in ionospheric radio wave propagation where transmitter-produced plasmas dominate over the natural ionospheric plasma and may eventually be employed as active components of communications, radar, and other systems.


Descriptors :   *PLASMAS(PHYSICS) , *RADIO WAVES , *IONOSPHERE , ATMOSPHERIC PHYSICS , IONIZATION , HIGH FREQUENCY , RADIO TRANSMITTERS , HIGH POWER


Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation


Distribution Statement : APPROVED FOR PUBLIC RELEASE