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Evolution of spatial and temporal correlations in the solar wind - Observations and interpretationObservations of solar wind magnetic field spectra from 1-22 AU indicate a distinctive structure in frequency which evolves with increasing heliocentric distance. At 1 AU extremely low frequency correlations are associated with temporal variations at the solar period and its first few harmonics. For periods of l2-96 hours, a l/f distribution is observed, which we interpret as an aggregate of uncorrelated coronal structures which have not dynamically interacted by 1 AU. At higher frequencies the familiar Kolmogorov-like power law is seen. Farther from the sun the frequency break point between the shallow l/f and the steeper Kolmogorov spectrum evolves systematically towards lower frequencies. We suggest that the Kolmogorov-like spectra emerge due to in situ turbulence that generates spatial correlations associated with the turbulent cascade and that the background l/f noise is a largely temporal phenomenon, not associated with in situ dynamical processes. In this paper we discuss these ideas from the standpoint of observations from several interplanetary spacecraft.
Document ID
19930049596
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Klein, L. W.
(Applied Research Corp. Landover, MD, United States)
Matthaeus, W. H.
(Bartol Research Inst. Newark, DE, United States)
Roberts, D. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Goldstein, M. L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1992
Publication Information
Publication: In: Solar Wind Seven; Proceedings of the 3rd COSPAR Colloquium, Goslar, Germany, Sept. 16-20, 1991 (A93-33554 13-92)
Publisher: Pergamon Press
Subject Category
Solar Physics
Accession Number
93A33593
Distribution Limits
Public
Copyright
Other

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