Abstract
During magnetically disturbed days, wind and temperature data obtained in the F-region from incoherent scatter, show strong oscillations of the ion temperature and velocity with period of some 2 hr. These oscillations can be interpreted as due to atmospheric gravity waves travelling Southwards. In this paper, the data are compared to auroral magnetograms. Temperature and velocity oscillations appear to follow magnetic events such as substorms, with a time delay of about one hour. Theoretical computations show that the intense heat deposited in the auroral E-region during a magnetic substorm, can generate atmospheric waves which propagate towards midlatitudes. The characteristics of the computed waves are in close agreement with the observed ones. Finally, the calorific energy deposited at midlatitude by dissipation of such waves is evaluated. The resulting thermospheric temperature increase is comparable to that predicted by Jacchia's model.
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