Comparison of the solar wind energy input to the magnetosphere measured by Wind and Interball-1

Physics

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Scientific paper

Timely solar wind measurements are indispensable for space weather forecasts and magnetospheric studies, but solar wind variations detected by a distant spacecraft might be different from those actually hitting Earth's magnetosphere. To determine how important these differences can be for geophysical applications, we compared energy input to the magnetosphere which was simultaneously measured by the Wind and Interball-1 spacecraft at various distances from the Earth. The percentage of equal (with differences less than 15%) measurements was found to increase from 30% at energies associated with small substorms to 100% for storm-level energies. The degree of the spacecraft separation along the /X GSE coordinate and in the /YZ GSE plane appeared to be of minor importance within the limits of Wind and Interball-1 orbits.

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