Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..372a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 1, p. 372-380.
Astronomy and Astrophysics
Astrophysics
4
Electron Scattering, Heat Flux, Interplanetary Space, Mathematical Models, Solar Wind, Conductive Heat Transfer, Energy Conversion, Potential Energy, Solar Corona
Scientific paper
The present model divides the interplanetary space into an 'inner region' and an 'outer region'. The solar wind is assumed to be one-fluid in the former zone and two-fluid in the latter zone, where a new equation for the electron heat flux replaces the classical heat conduction law because the plasma is not collision dominated. The model produces solutions for all physical quantities as functions of heliocentric distance that are in good agreement with quiet-time observations. The numerical results and a new interpretation of the gravitational potential energy show that the main energy conversions in the solar coronal expansion are from heat conduction and enthalpy into mechanical energy, whereas the magnetic component plays an insignificant role. It is also found that the total energy equation cannot be replaced by the polytropic law.
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