Numerical simulation of the formation of thin ionization layers at high latitudes

Details Numerical simulation of the formation of thin ionization layers at high latitudes Numerical simulation of the formation of thin ionization layers at high latitudes

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..404b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, March 1991, p. 404-407.

Physics

20

Digital Simulation, Ionospheric Ion Density, Nitrogen Ions, Oxygen Ions, Polar Regions, Sporadic E Layer, Magnetohydrodynamic Flow, Molecular Ions

Scientific paper

The role of the electric field in the formation of thin ionization layers at high latitudes was investigated using a one-dimensional simulation model of high-latitude sporadic-E layers developed for that purpose. The ion densities of O(+), O2(+), N(+), N2(+), NO(+), and Fe(+) ions and the temperatures were computed as a function of altitude; then, the energy equation was solved for electrons, neutrals, and a generic ion having the mean ion mass and velocity. It was found that the large perpendicular electric field (50 mV/m) used in the simulation leads to a significant heating of the ions and, to a smaller extent, of the electrons and neutrals. An electric field directed between the magnetic west and north results in convergent plasma flow and, thus, in the formation of ionization layer at about 120-130 km altitude, while fields directed to the west and south result in layers at lower altitudes (100-115 km).

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