Stationarity of magnetohydrodynamic fluctuations in the solar wind

Physics

Scientific paper

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Homogeneity, Interplanetary Magnetic Fields, Magnetohydrodynamics, Solar Wind, Ergodic Process, Imp, International Sun Earth Explorers, Solar Radiation, Turbulence, Voyager Project

Scientific paper

Solar wind research and studies of charged particle propagation often assume that the interplanetary magnetic field represents a stationary random process. The extent to which ensemble averages of the solar wind magnetic fields follow the asymptotic behavior predicted by the ergodic theorem was investigated. Several time periods, including a span of nearly two years, are analyzed. Data intervals which span many solar rotations satisfy the conditions of weak stationarity if the effects of solar rotation are included in the asymptotic analysis. Shorter intervals which include a small integral number of interplanetary sectors also satisfy weak stationarity. The results are illustrated using magnetometer data from the ISEE-3, Voyager and IMP spacecraft.

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