A case study of transient event motion in the magnetosphere and in the ionosphere

Physics

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Earth Ionosphere, Earth Magnetosphere, Interplanetary Magnetic Fields, Ionospheric Disturbances, Solar Activity Effects, Solar Wind, Dynamic Pressure, Magnetometers, Shock Waves, Statistical Analysis

Scientific paper

We present a case study of the magnetospheric and ionospheric response to a series of repetitive (7-8 min) solar wind dynamic pressure and interplanetary magnetic field (IMF) strength variations generated at the bow shock. During a period of duskward and antisunward IMF orientation, the magnetospheric and ionospheric observations indicate transient events moving dawn-ward and duskward away from a point of origin at or after local noon. In contrast, during a subsequent period of dawn-ward and antisunward IMF orientation, the observations indicate events moving duskward away from a point of origin at or prior to 0900 LT. We consider explanations in terms of pressure pulse driven riplets on the magnetopause or directly driven bursts of antiparallel merging.

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