A comparative study of H(+) and He(+) at sunspot minimum and sunspot maximum

Details A comparative study of H(+) and He(+) at sunspot minimum and sunspot maximum A comparative study of H(+) and He(+) at sunspot minimum and sunspot maximum

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..673n&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, Oct. 1983, p. 673-682. Research supported by the Unive

Physics

8

Helium Ions, Hydrogen Ions, Ionic Diffusion, Ionospheric Ion Density, Midlatitude Atmosphere, Solar Activity Effects, Sunspots, Diurnal Variations, Oxygen Ions

Scientific paper

The time-dependent equations of continuity and momentum for O(+), H(+) and He(+) are solved for the section of a mid-latitude flux tube from the lower F2-region to the equator. H(+) and He(+) behavior is compared for both sunspot minimum and sunspot maximum conditions at equinox concentrating on light ion replenishment following a magnetic storm and light ion fluxes. It is found that the He(+) fluxes vary little from day to day throughout the replenishment period following a magnetic storm. In contrast, the H(+) fluxes can vary considerably throughout the replenishment period, particularly at sunspot minimum. In addition, results show that temperatures above 1000 km have an important influence on the variation and magnitude of H(+) fluxes and consequently also influence the replenishment of H(+). At sunspot minimum the He(+) content reaches its maximum value after eight days of replenishment and then starts to decrease whilst the H(+) content continues increasing. This is explained in terms of night-time H(+) return flows dragging the He(+) to regions where it can readily recombine. Consequently light ion depletion following a magnetic storm provides a loss process for neutral helium at sunspot maximum but not necessarily at sunspot minimum.

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