Determination of Precipitating Energy and Energy Flux from Space-based Auroral Observations.

Physics

Scientific paper

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2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2788 Storms And Substorms

Scientific paper

The impact of magnetospheric particles into the upper atmosphere and the ionosphere of Earth produces auroral luminosities and modifies the conductivity and composition of the atmosphere/ionosphere system above ~80 km. Over the past several decades, a number of models have been developed to determine the energy and energy flux of the precipitating auroral electrons from auroral observations and to infer the Hall and Pedersen conductivities of the auroral zone ionosphere. The nighttime auroral oval is observed with the Visible Imaging System on the Earth-orbiting Polar spacecraft of NASA Goddard Space Flight Center with narrowband filters corresponding to the auroral emissions of atomic oxygen at 630.0 nm and the N2+ molecular ion at 391.4 nm. The ratio of the auroral intensities is used as input to the models to obtain the characteristic energy of the precipitating electrons while the absolute intensity of the N2+ is utilized to determine the energy flux. The characteristic energy and energy flux are used as intermediary inputs to the models to infer the ionospheric conductivities. The determined energy and energy flux measurements will be presented for several storm and substorm events. In addition, the results of a correlation of the determined characteristic energies and energy fluxes with the ultraviolet auroral intensities observed with the VIS Earth camera will be presented. The derived characteristic energy and energy flux of the precipitating electrons will be validated by detailed comparison with observations of the precipitating auroral electrons by the FAST spacecraft.

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