A theoretical study of the time-dependent behaviour of O2(+) in the mid-latitude plasmasphere

Details A theoretical study of the time-dependent behaviour of O2(+) in the mid-latitude plasmasphere A theoretical study of the time-dependent behaviour of O2(+) in the mid-latitude plasmasphere

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1591m&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 32, Dec. 1984, p. 1591-1603. Research supported by the University of Riyadh.

Physics

7

Midlatitude Atmosphere, Oxygen Ions, Plasmasphere, Positive Ions, Thermal Diffusion, Diurnal Variations, Ionic Collisions, Solar Terrestrial Interactions, Sunspots

Scientific paper

The effect of thermal diffusion on the behavior of doubly-charged oxygen ions in the plasmasphere at L = 3 is studied theoretically. Time-dependent equations of continuity and momentum of O2(+) in post-magnetic storm conditions are derived which are used to calculate the densities and fluxes for a period of several days according to sunspot maximum and sunspot minimum parameters. It is shown that large amounts of O2(+) are present near the equator at sunspot maximum, but relatively few at sunspot minimum. The high densities at O2(+) minimum are attributed to the combined effects of O2(+)-O(+) collisions. It is suggested that at sunspot maximum the O(+) layer acts as a collisional barrier below the O2(+) production region preventing O2(+) from sinking towards regions with high recombination rates. Some of the possible types of vertical temperature profiles which are likely to enhance equatorial O2(+) densities are identified.

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