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Ensemble Space-Time Correlation of Plasma Turbulence in the Solar Wind

AuthorMatthaeus, H.; Weygand, M.; Dasso, S.;
Keywordsparker solar probe; Solar Probe Plus

Single point measurement turbulence cannot distinguish variations in space and time. We employ an ensemble of one- and two-point measurements in the solar wind to estimate the space-time correlation function in the comoving plasma frame. The method is illustrated using near Earth spacecraft observations, employing ACE, Geotail, IMP-8, and Wind data sets. New results include an evaluation of both correlation time and correlation length from a single method, and a new assessment of the accuracy of the familiar frozen-in flow approximation. This novel view of the space-time structure of turbulence may prove essential in exploratory space missions such as Solar Probe Plus and Solar Orbiter for which the frozen-in flow hypothesis may not be a useful approximation.

Year of Publication2016
JournalPhysical Review Letters
Number of Pages245101
Date Published06/2016