Ion distributions in the high-latitude topside ionosphere

Details Ion distributions in the high-latitude topside ionosphere Ion distributions in the high-latitude topside ionosphere

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986angeo...4...97a&link_type=abstract

Annales Geophysicae, Series A - Upper Atmosphere and Space Sciences, vol. 4, April 1986, p. 97-106.

Computer Science

Sound

2

Earth Ionosphere, F Region, Ion Distribution, Ionospheric Ion Density, Polar Regions, Annual Variations, Atmospheric Models, Helium, Hydrogen, Ionospheric Sounding, Oxygen, Satellite Observation, Winter

Scientific paper

An earlier model of the high-latitude ionosphere that includes the ions H(+), He(+) and O(+) on an equal footing has been modified. Velocities applied at great altitudes (in this case at 10,000 km) are arranged to give velocities at 1400 km altitude that agree on average with Isis 2 data. Also, light-ion flows in the topside ionosphere respond to changing F-layer conditions. The model has been used to examine ion distributions for different seasons, assuming two-cell convection and sunspot minimum atmospheric parameters. In winter at high latitudes the H(+)/O(+) transition level usually lies above 500 km altitude, apart from the regions of the midlatitude trough and the high-latitude hole; at 500 km altitude, He(+) may be the dominant ion in these trough regions. A deep midlatitude trough present in the F-region may barely be evident in the total ion concentration at altitudes around 800 km. At equinox and in summer the consequences of smaller solar zenith angles and lower neutral atomic hydrogen and neutral helium concentrations are evident.

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