Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.7583r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Sept. 1, 1984, p. 7583-7588.
Physics
8
Atmospheric Circulation, Solar Eclipses, Thermosphere, Atmospheric Models, Atmospheric Temperature, Mixing, Nitrogen, Solar Terrestrial Interactions, Vertical Distribution, Winds Aloft
Scientific paper
The NCAR thermospheric general circulation model was used to calculate the time-dependent thermospheric wind, temperature, and compositional response to a solar eclipse. The model features include a 5 deg grid with 24 constant pressure layers extending from 97-500 km altitude. Procedures were defined to evaluate the solar EUV and UV fluxes, the ion drag parameters and ion drift velocities. An eclipse function was devised to account for the fraction of uneclipsed sun along the path of totality. Maximum disturbances were projected along the path of totality, with winds converging from all directions and reaching velocities of 60 m/sec in upper levels. The shadow's center featured a -70 K temperature anomaly and a -8 m/sec vertical wind anomaly. Mixing ratios of N2 and O increased due to sudden thermospheric cooling while at 300 km the number densities of both species decreased.
Dickinson Robert E.
Rees Manfred H.
Ridley E. C.
Roble Raymond G.
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