title: Ensemble Space-Time Correlation of Plasma Turbulence in the Solar Wind.
abstract: 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.
authors.affiliation: Bartol Research Institute, Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, USA.
authors.forename: W H
authors.initials: WH
authors.lastname: Matthaeus
authors.affiliation: Institute for Geophysics and Planetary Physics, University of California, Los Angeles, California 90095, USA.
authors.forename: J M
authors.initials: JM
authors.lastname: Weygand
authors.affiliation: Instituto de Astronomía y Física del Espacio (IAFE) and Departamento de Ciencias de la Atmósfera y los Océanos and Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina.
authors.forename: S
authors.initials: S
authors.lastname: Dasso