Equatorial particle precipitation during magnetic storms and relationship to equatorial thermospheric heating

Physics

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Atmospheric Heating, Equatorial Atmosphere, Magnetic Storms, Particle Precipitation, Thermosphere, Brazil, Neutral Atoms, Ohmic Dissipation, Ring Currents, Trapped Particles

Scientific paper

Optical observations of ring-current particle precipitation from a near-equatorial site in Brazil are compared with variations in the AE and Dst indices. Precipitation occurs during ring-current injection when AE is large, but for large AE without ring-current injection, little precipitation is seen. Comparisons are also made with 630-nm observations of thermospheric heating made simultaneously in Peru. The thermospheric temperatures have been corrected for instrumental drift, and temperature enhancements of several hundred K are present. It is not possible to associate clearly the heating with direct precipitation nor in the short term with transport of heat from higher latitudes. On a longer time scale it is likely that both midlatitude ring-current sources and high-latitude Joule heating sources are involved.

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