Simulation study of mid-latitude ionosphere fluctuations observed at Millstone Hill

Physics

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Ionosphere: Ionosphere/Magnetosphere Interactions (2736), Ionosphere: Ionospheric Dynamics, Ionosphere: Midlatitude Ionosphere, Ionosphere: Modeling And Forecasting

Scientific paper

Quasi-periodic variations in ionospheric F-region parameters associated with interplanetary magnetic field fluctuations have been reported by Huang et al. [2002]. Two mechanisms that could generate these ionospheric fluctuations are a time-varying electric field or neutral wind. We present simulation results of the response of the mid-latitude F-region ionosphere to these drivers using the NRL ionosphere model SAMI2. We obtain good agreement with Millstone Hill density and velocity observations for a zonal F-region electric field E ~= +/-2.4 mV/m. We also obtain good agreement with density observations if the neutral wind fluctuates ~+/-40 m/s along the geomagnetic field. However, this neutral wind variation corresponds to ~+/-140 m/s in the meridional component of the horizontal neutral wind, and the fluctuating ion velocity is ~30% larger than those observed. This suggests that a fluctuating penetration electric field is probably responsible for the Millstone Hill observations.

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