The response of thermospheric nitric oxide to an auroral storm. II - Auroral latitudes

Physics

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Atmospheric General Circulation Models, Auroral Ionization, Auroras, Magnetic Storms, Nitric Oxide, Particle Precipitation, Thermosphere, Atmospheric Heating, Auroral Zones, Photochemical Reactions, Solar Mesosphere Explorer, Vertical Air Currents

Scientific paper

NOAA 6 and 7 particle measurements are used, in conjunction with a statistical model of the auroral particle precipitation, to study the response of auroral NO to the auroral storm of September 19, 1984. The results of a time-dependent photochemical calculation show that particle precipitation can more effectively produce NO than can Joule heating, in contrast to nonauroral latitudes where heating is important. Both the model and the NO data show NO increases as a result of the storm; however, the absolute magnitude of the NO in the model, as well as the amplitude of the increase, significantly exceeded what was observed. Two possible explanations for the this discrepancy are proposed.

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