Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986thdy.work..205m&link_type=abstract
In NASA. Goddard Space Flight Center Thermosphere Dynamics Workshop, Volume 2 p 205-219 (SEE N86-29301 20-42)
Physics
Atmospheric Circulation, Gas Density, Magnetic Storms, Neutral Gases, Thermosphere, Wind Velocity, Gravity Waves, Magnetic Poles, Meridional Flow, Periodic Variations, Wind Direction, Wind Measurement, Wind Profiles
Scientific paper
A new thermospheric wind measurement technique is reported which is based on a Satellite Electrostatic Triaxial Accelerometer (SETA) system capable of accurately measuring accelerations in the satellite's in-track, cross-track and radial directions. Data obtained during two time periods are presented. The first data set describes cross-track winds measured between 170 and 210 km during a 5-day period (25 to 29 March 1979) of mostly high geomagnetic activity. In the second data set, cross-track winds and neutral densities from SETA and exospheric temperatures from the Millstone Hill incoherent scatter radar are examined during an isolated magnetic substorm occurring on 21 March 1979. A polar thermospheric wind circulation consisting of a two cell horizontal convection pattern is reflected in both sets of cross-track acceleration measurements. The density response is highly asymmetric with respect to its day/night behavior. Latitude structures of the density response at successive times following the substorm peak suggest the equatorward propagation of a disturbance with a phase speed between 300 and 600 m/s. A deep depression in the density at high latitudes (less than 70 deg) is evident in conjunction with this phenomenon. The more efficient propagation of the disturbance to lower latitudes during the night is probably due to the midnight surge effect.
Forbes Jeffrey M.
Marcos Frank A.
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