Computer Science
Scientific paper
Dec 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968ssrv....8..690h&link_type=abstract
Space Science Reviews, Volume 8, Issue 5-6, pp. 690-749
Computer Science
48
Scientific paper
Direct observations of solar-wind particles are discussed in detail. A well-defined ‘quiet state’ of the solar wind is indicated by observations made from 1962 to 1967. The plasma properties in this quiet state are compared with those predicted by hydrodynamic models of the coronal expansion. While the basic flow parameters are predicted with reasonable accuracy by these models, the thermal properties of the solar-wind particles remain largely unexplained. As the interplanetary plasma is not in thermodynamic equilibrium, the thermal properties are determined by the specific energy-transfer mechanisms operative in the plasma. The observed magnitude of the magnetic-field-aligned anisotropy of proton random motions is interpreted as evidence for the presence of instability-generated waves; the effect of these waves on the thermal properties is examined. The observed chemical compositon of the solar wind is discussed and related to the solar origin of the inter-planetary material. Finally, the spatial and temporal structure of the medium is investigated through consideration of patterns of variation in the plasma properties.
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