Response of the equatorial thermosphere to magnetic activity analysed with accelerometer total density data. Asymmetrical structure

A great deal of accurate total density data from the CACTUS accelerometer experiment has been collected in equatorial regions during the last minimum of the solar cycle. Using these data, an analysis of the magnetically disturbed thermosphere has been performed with an improved resolution. Time delay of the response, latitudinal and longitudinal variations for solstice, day-time and night-time conditions have been studied. An attempt is made to interpret the behaviour of the thermosphere in the light of existing theories. An asymmetrical heating in latitude and a heating depending on longitude are needed in order to interpret the results.