Other
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990angeo...8..171b&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 8, March 1990, p. 171-189.
Other
100
Atmospheric Ionization, Helium Ions, Ionized Gases, Plasmasphere, Solstices, Earth Ionosphere, Equinoxes, Mathematical Models, Satellite Orbits, Solar Cycles
Scientific paper
The study concentrates on the behavior of He(+) near 50-deg dip latitude (L = 3) where previous observations from two satellite orbits show He(+) to be the dominant light-ion. Possible local times other than those sampled when He(+) is the dominant ion are considered, and the possibility of such He(+) behavior is assessed using a mathematical model. The model solves coupled time-dependent equations of continuity, momentum, and energy balance for the O(+), He(+), H(+), N2(+), O2(+), and NO(+) ions, and the electrons along centered-dipole magnetic-field lines. Several sets of model calculations are carried out to derive results applicable to the winter and summer solstices and to equinox during solar maximum and solar minimum, and it is noted that altitude regions where He(+) is the dominant ion are most pronounced in the results for winter solstice, but there is no indication that He(+) could become the dominant ion during summer at solar maximum or at any time during solar minimum.
Bailey Graham J.
Sellek R.
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