Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dpplm1003g&link_type=abstract
American Physical Society, 44th Annual Meeting of the Division of Plasma , abstract #LM1.003
Physics
Scientific paper
Plasmas respond sensitively to electromagnetic forces, but they may interact collisionally with ambient neutrals that do not. An interesting analogy to this process appears in line-driven winds from hot stars, in which metal ions receive far stronger radiative forces than does the ambient hydrogen plasma, but the ions may share these stresses collisionally with the plasma. Since virtually all the particles in a hot-star wind are charged, magneto-hydrodynamic coupling is also a possibility, and tight coupling between the various species is typically assumed, both in terms of the driving of the winds and the radiative instabilities present. Here I discuss the sharing of bulk flow energy and its dissipation into thermal energy due to these processes, on scales much larger than dissipative singularities such as shocks. Important length scales to compare to the collisional mean free path include the stellar radius and the much smaller Sobolev length, in analogy with relevant plasma scales.
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