Comparative study of ion escape at high latitude with simulation and EISCAT observations

Details Comparative study of ion escape at high latitude with simulation and EISCAT observations Comparative study of ion escape at high latitude with simulation and EISCAT observations

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..804t&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 9, Dec. 1991, p. 804-820.

Physics

5

Computerized Simulation, Eiscat Radar System (Europe), Hydrogen Ions, Oxygen Ions, Particle Acceleration, Polar Regions, Thermal Plasmas, Atmospheric Composition, Earth Magnetosphere, Electron Energy, Finite Difference Theory, Plasmasphere, Very High Frequencies

Scientific paper

Ion escape at high latitude by use of comparative results from EISCAT VHF measurements and from a code simulating the observed thermal plasma. The code consists of the resolution, of the continuity equation and the momentum equation that takes account of the acceleration and of the nonlinear terms, for O+ and H+. Ion and electron temperatures are derived from two EISCAT experiments as functions of altitude and time. The results show a good agreement between calculated and measured densities, velocities and fluxes, although some differences exist which are partly explained by underestimated values of MSI86 neutral densities of O and especially H. The variation of H density with altitude indicates that it is more complicated than a simple factor. Knowing the ion convection velocity, it is shown that some information can be derived for the meridional neutral wind component. The code indicates that supersonic velocities of H+ might be reached in the experimental conditions, provided the plasma pressure at high altitudes is below a reasonable value.

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