Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981plap.rept...77g&link_type=abstract
In ESA Plasma Astrophys. p 77-82 (SEE N82-20030 10-88)
Astronomy and Astrophysics
Astrophysics
Gas Ionization, Magnetohydrodynamic Flow, Plasma Turbulence, Flow Velocity, Ionizing Radiation, Linear Energy Transfer (Let), Magnetohydrodynamic Stability
Scientific paper
A quasilinear theory of collisionless energy transfer from a counterstreaming plasma-gas flow to electrons is presented. The critical ionization velocity was reexamined. It is recognized that this phenomenon requires enhanced heating of electrons, via some hypothetical collisionless interaction between plasma species, that can be studied by a well developed weak plasma turbulence theory. Since a plasma cannot interact collisionlessly with a neutral gas, it is assumed that, in astrophysical situations, some seed ionized atoms are produced in the plasma flow by external ionization sources, e.g., stellar ultraviolet radiation. The orbits of newly ionized atoms are such that they form an unstable distribution in a velocity space. Although the branch of plasma modes excited by an instability is the same in a wide range of plasma and field parameters, the driving term has a different form in two limiting cases, which are considered.
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