Helium ion outflow from the terrestrial ionosphere

Details Helium ion outflow from the terrestrial ionosphere Helium ion outflow from the terrestrial ionosphere

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978p%26ss...26..255r&link_type=abstract

Planetary and Space Science, vol. 26, Mar. 1978, p. 255-268.

Physics

5

Atmospheric Models, Equilibrium Flow, Helium Ions, Upper Ionosphere, Continuity Equation, Density Distribution, Diffusion Coefficient, Hydrogen Ions, Oxygen Ions, Photoionization, Temperature Profiles

Scientific paper

For situations where ion outflow occurs from the topside ionosphere, steady-state solutions for the He(+) continuity, momentum, and energy equations have been obtained self-consistently, yielding density, velocity, and temperature profiles of He(+) from 200 to 2000 km altitude. The study indicates that the outflowing He(+) has density profiles of similar shape to those of H(+), for basically different reasons; the effect of the perpendicular electric field differs considerably for H(+) and He(+); the fractional heating of He(+) due to the He(+)-O(+) relative flow is not as effective in heating He(+) as the flow is in heating H(+); during magnetospheric disturbances the He(+) peak density decreases only by approximately a factor of 2; and the He(+) escape flux over the winter pole is approximately a factor of 20 greater than the He(+) escape flux over the summer pole. The possibility of interhemispheric He(+) flux from winter to summer on high-latitude closed field lines is considered.

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