Main properties of space plasma

1.1.1. Neutrality of space plasma and Debye radius

Space plasma is mostly very highly ionized gas where the main interactions between particles are Colon interactions. One of the main characteristics of space plasma (as in any plasma) is the value of the Debye radius:

where the temperature of plasma T is in °K, and concentration of plasma particles N

is in cm . It is important that the Debye radius for space plasma be much smaller than the dimension of the system. For example, in solar wind near the Earth's orbit

(T < 10 K, N > 1cm ) we obtain rD < 2 X10 cm; in the solar corona

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