Abstract
In situ measurements of the neutral constituent densities and temperature were made at 200 km by the open source mass spectrometer on the AE-D satellite during a rapid onset of the magnetic activity that occurred in January 1976. At high latitudes a 340 K temperature increase was accompanied by an increase in N2 and O2 concentrations, a decrease in He concentration, and a variable response in O concentration. At low latitudes, the rise in temperature was smaller, however; all constituent densities increased. It is concluded that the observed variations are consistent with heating and upward winds at high latitudes, meridional flow towards lower latitudes and subsidence near the equator.
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