Accession Number : ADA259741


Title :   Metallic Ions and Atoms in the Upper Atmosphere


Descriptive Note : Annual rept. 1 Jan-31 Dec 92,


Corporate Author : BOSTON UNIV MA


Personal Author(s) : Forbes, Jeffrey M ; Roble, R G


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a259741.pdf


Report Date : 15 Oct 1992


Pagination or Media Count : 14


Abstract : The main focus of research under AFOSR Grant F49620-92-J-0092 is to investigate the global and local transport of metallic ions in the upper atmosphere, in particular the layering of ionization, through use of comprehensive numerical models which account for realistic meteoric sources, chemical conversions and sinks, and transport by molecular and eddy diffusion, winds, and electric fields. The ultimate goal is to better understand the mechanisms producing ionization layers, and ultimately the seasonal, latitudinal, local time, and temporal variations in the occurrences of ionization layers. Plasma layering can affect HF communications by introducing new reflection paths thus complicating the propagating modes, and presumably in extreme cases by producing blanketing effects. In addition, plasma irregularities may also accompany the sharp gradients characterizing the plasma layers.


Descriptors :   *IONS , *METALS , *ATOMS , *IONIZATION , *LAYERS , *ATMOSPHERES , CONVERSION , PROPAGATION , WIND , PATHS , TIME , ADDITION , GRADIENTS , EDDY CURRENTS , UPPER ATMOSPHERE , DIFFUSION , TRANSPORT , VARIATIONS , REFLECTION , ELECTRIC FIELDS , NUMERICAL ANALYSIS , PLASMAS(PHYSICS) , GLOBAL , MODELS , CHEMICALS


Subject Categories : Atmospheric Physics
      Inorganic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE