Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994iaf..conf.....c&link_type=abstract
Conference Paper, Instituto de Astronomia y Fisica del Espacio Buenos Aires, Argentina
Physics
Heat Flux, Heat Transfer, Solar Corona, Solar Wind, Plasmas (Physics), Kinetic Energy, Electrons, Fokker-Planck Equation, Distribution Functions, Ion Charge, Magnetic Fields, Electron Scattering, Electron Flux Density
Scientific paper
A nonlocal analytical expression for the electron heat flux in low collisional plasmas, which reproduces known results at high, low and intermediate ion charge number Z is derived by solving the Fokker-Planck equation in a narrow, tail-energy range. The solutions involve an external magnetic field. A correction to the anisotropy of the distribution function due to the divergent magnetic field lines was included. It is shown that the heat flux can be expressed taking into account a delocalization function for the suprathermal particles. The convolution formula leads in a physically relevant way to the delocalization of the heat flux. The theory is applied to the lower solar corona, showing that a non-local, ballistic suprathermal tail originated near the coronal base dominates the energy flux at distances r approximately equal to 4 solar radius. The further development of the anisotropy of the distribution function has been studied through a test-particle model, revealing that particles with v(parallel) greater than 5v(e), will eventually run away due to the magnetic pumping effect. The scaling with v(parallel) of the parallel distribution function and of the perpendicular temperature is also derived.
Canullo M. V.
Costa Alfredo
Ferro Fontan Constantino
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