# Cosmic Plasma Physics by Boris V. Somov (auth.)

By Boris V. Somov (auth.)

of the approximation handy can be defined from the perspective of physics instead of of many attainable astronomical purposes. After that, as an relief to targeted figuring out, please go back with pencil and paper to see the lacking steps (if any) within the formal arithmetic. at the foundation of such an technique the coed drawn to sleek astro physics, its present perform, will locate the solutions to 2 key questions: (1) what approximation is the easiest one (the least difficult yet enough) for descrip tion of a phenomenon in cosmic plasma; (2) how tO,build an sufficient version for the phenomenon, for instance, a sun flare. perform is de facto vital for realizing the speculation of cosmic plasma. similar routines (problems and solutions supplemented to every bankruptcy) to enhance ability don't thwart the idea yet serve to raised realizing of cosmic plasma physics. As for the purposes, choice obviously is given to actual approaches within the sun plasma. Why? - a lot realization to sunlight plasma physics is con the opportunity of th~ all-round observational try out of theoretical ditioned through versions. This assertion essentially pertains to the strategies within the sunlight atmo sphere. for example, flares at the solar, unlike these on different stars in addition to loads of different analogous phenomena within the Universe, might be visible of their improvement, i. e.

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65) over d3Yl d3Y2. 66) Here the function 9 (rl' r2) = JJf (Xl, X2) d3Yl d3Y2. 66) over rl and designate the function 9 (rl' r2) where r12 = 1rl - r2 = 9 (r[2) , I. We obtain the equation 2 ne2) -_ - 9 (r12 kBT Its solution is 9 (r) = -Co r J 9 (rl3) - - d 3r3 . 69) is the Debye radius. 28)) for the case when the shielding is due to the particles of one kind - due to electrons. 2. Thus the Debye radius is shown to be a characteristic length scale for the pair correlation function. 5. Debye Shielding (r ) 41feco =n--exp -- .

X = ~. 5), the averaging of the smooth averaged function does not change it. t af = Va ara . X Here the index Q = 1,2,3. In order to average the term containing the force F, let us represent it as a sum of a mean force (F) and the force due to the difference of the real force field from the mean (smooth) one: F=(F)+F'. 2) and averaging this term, we have Chapter 2. X f ~ [...!... x m j dt] dX + t,. x t,. 12) oj dXdt. t oj m avo dX dt . 14) are called the kinetic equation and the collisional integral (d.

Introduce the N-particle distribution function of the form N j(t, r, v) =L 8 (r - ri(t)) 8 (v - Vi(t)) . 36) i=l We shall call such a distribution function the exact one. 27). The resulting three terms are +L (-1) 8 (r - ri(t)) 8~ (v - Vi(t)) v~, i The sum of these terms equals zero. It can occur just then that all the coefficients of different delta function arguments equal zero as well. 37) Thus I the Liouville equation for an exact distribution function is equivalent to the Newton set of equations for a particle motion, both describing a purely dynamic behaviour of the particles.