The gravity wave - TID relationship: insight via theoretical model - EISCAT data comparison.

Physics

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Earth Atmosphere: Gravity Waves

Scientific paper

Atmospheric gravity waves (AGWs) in the thermosphere are of particular interest because of their rôle in the equatorward redistribution of auroral momentum and energy input. However, their direct measurement is difficult and so they are normally traced by their ionospheric signatures, the travelling ionospheric disturbances (TIDs). These can be routinely observed, especially with incoherent scatter radars like the EISCAT-facility, which measure all the fundamental ionospheric parameters. In order to reliably infer AGW parameters from TID data, however, one needs to know the physics of the AGW-TID relationship as comprehensively as possible. The authors investigated this relationship by means of one-to-one comparison of theoretical model results with EISCAT data for several TID events. The relevant physics, the modeling procedure and the results of the comparisons are discussed. As a representative example, one typical event on 6 September 1988 is presented in some detail.

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