Modeling the solar cycle dependence of quiet-time ion upwelling at high geomagnetic latitudes

Details Modeling the solar cycle dependence of quiet-time ion upwelling at high geomagnetic latitudes Modeling the solar cycle dependence of quiet-time ion upwelling at high geomagnetic latitudes

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1141c&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Oct. 1989, p. 1141-1144.

Physics

28

Geomagnetic Latitude, Hydrogen Ions, Oxygen Ions, Solar Cycles, Gravitational Effects, Helium Ions, Mathematical Models

Scientific paper

Initial results are reported which show how solar-cycle variations of the thermosphere modify the composition and intensity of ion upflows at high geomagnetic latitudes. Using an improved version of the one-dimensional hydordynamic polar wind model developed by Gombosi et al. (1985), H(+) and O(+) vertical flow profiles are obtained using different thermospheric states corresponding to solar-cycle minimum and maximum. Comparing the quasi-equilibrium flux profiles for both cases, it is found that H(+) upwelling shows almost no variations in intensity with solar cycle, while O(+) exhibits a 10-fold increase from solar minimum to solar maximum. These changes result in an O(+) dominated upflow at solar maximum, while H(+) flows dominate at solar minimum. These different behaviors are related to long-term thermospheric changes resulting from solar cycle EUV/UV differences.

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