Accession Number : AD1010313


Title :   Creating Space Plasma from the Ground


Descriptive Note : Technical Report,14 Aug 2012,14 May 2016


Corporate Author : Utah State University Logan United States


Personal Author(s) : Carlson,Herbert C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/1010313.pdf


Report Date : 12 May 2016


Pagination or Media Count : 46


Abstract : It was predicted (Carlson, 1987; 1993) that once HF radio waves achieved ionospheric energy densities comparable to that from the solar EUV, they could produce their own ionosphere. That work estimated a GW ERP of rf energy would produce an ionosphere half that from an overhead sun, assuming 15 efficiency conversion of rf energy to accelerated electron energy. [Until 2009 only one experimental estimate existed, 15 from Carlson, 1982.] The production mechanism proposed was impact ionization, by HF-accelerated electrons, to energies exceeding thermospheric ionization potentials. Solar EUV, aurora, and high-power HF radio-waves produce suprathermal electrons in the 15-100 eV energy range, yielding long-lived ionization in the ionosphere. Once suprathermal electrons are produced, the Aeronomy of production, transport, and recombination are in common. The key to understanding artificial ionization thus reduces to conversion efficiency of HF energy to ionization. By 2008 technology reached GW ERP. The prediction was tested, and confirmed [Pedersen et al, 2009, Blagoveschenskaya et al, 2009] at high latitudes.


Descriptors :   Ionosphere , SPACE PLASMAS , ionization , radio waves , electrons , high latitudes , High frequency


Distribution Statement : APPROVED FOR PUBLIC RELEASE