Ion neutral coupling in the high latitude thermosphere, part 1

Details Ion neutral coupling in the high latitude thermosphere, part 1 Ion neutral coupling in the high latitude thermosphere, part 1

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986thdy.work..185k&link_type=abstract

In NASA. Goddard Space Flight Center Thermosphere Dynamics Workshop, Volume 2 p 185-187 (SEE N86-29301 20-42)

Computer Science

Atmospheric Circulation, F Region, Interplanetary Magnetic Fields, Neutral Gases, Neutral Particles, Thermosphere, Dynamics Explorer Satellites, International Sun Earth Explorer 3, Magnetic Poles, Solar Wind, Universal Time, Wind Velocity

Scientific paper

Measurements of the neutral wind in the polar F region from Dynamics Explorer-2 (DE-2) were used to illustrate asymmetries in the neutral circulation that are dependent on the sign of the B sub y component of the interplanetary magnetic field (IMF). Individual DE-2 orbits and averaged data sets from different Universal times are presented. The data are categorized according to the sign of the hourly averaged IMF B sub y component measured by ISEE-3 for the hour preceding the DE-2 measurement. The major features observed are: (1) an asymmetry in the polar cap neutral flow velocity with the region of most rapid antisunward flow shifting from the dawn side to the dusk side of the polar cap as B sub y changes from positive to negative; (2) a shift in magnetic local time of the region of entry of neutral gas into the polar cap from a location on the dawn side of the noon-midnight meridian for B sub y positive to one more biased towards the dusk side for B sub y negative; (3) an enhancement in the velocities associated with the dawn, anti-clockwise neutral vortex B suby y negative relative to those observed for B sub y positive. The B sub y neutral wind asymmetries can be explained by similar asymmetries, previously observed, in the polar ion convection pattern. They imply a direct causal relationship between solar wind/magnetosphere coupling and neutral thermospheric dynamics.

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