Abstract
This paper reviews the recent results concerning streams and magnetic fields in the inner solar system. Specifically, it discusses in situ magnetic field and plasma observations within 1 AU which describe MHD stream flows and Alfvénic fluctuations, and it discusses the latest theories of those phenomena. Observationally, there have been significant advances in our understanding of streams and fluctuations as the result of acquiring nearly complete sets of high resolution plasma and magnetic data simultaneously at two or more points by IMPs 6, 7, and 8, Mariner-Venus-Mercury, HELIOS-1, and HELIOS-2. HELIOS and IMP observations and coronal hole observations demonstrated that streams can have very thin boundaries in latitude and longitude near the Sun. This has necessitated a revision of earlier views of stream dynamics, for it is now clear that magnetic pressure is a major factor in the dynamics of stream in the inner solar system and that nonlinear phenomena are significant much closer to the Sun than previously believed. Simultaneous IMP 6, 7, and 8 observations of Alfvénic fluctuations have shown that they are probably not simply transverse Alfvén waves; they suggest that Alfvénic fluctuations are better described as nonplanar, large-amplitude, ‘general Alfvén’ waves moving through an inhomogeneous and ‘discontinuous’ medium, and coupled to a compressive mode.
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Proceedings of the Symposium on Solar Terrestrial Physics held in Innsbruck, May–June 1978.
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Burlaga, L.F. Magnetic fields, plasmas, and coronal holes: The inner solar system. Space Sci Rev 23, 201–216 (1979). https://doi.org/10.1007/BF00173810
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DOI: https://doi.org/10.1007/BF00173810