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→Frequencies: Correct CGS equation, see Talk:Plasma parameters#electron plasma frequency factor seems to be wrong |
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<math display="block">c_s = \left(\frac{\gamma ZkT_e}{m_i}\right)^\frac{1}{2} \approx 9.79 \times 10^5\,\left(\frac{\gamma ZT_e}{\mu}\right)^\frac{1}{2}\ \mbox{cm/s},</math>
where <math>\gamma</math> is the [[adiabatic index]] and <math>T_e</math> is in [[Electronvolt|electronVolt]]
| '''[[Hannes Alfvén|Alfvén]] velocity''', the speed of the [[Alfvén wave|waves]] resulting from the mass of the ions and the restoring force of the magnetic field:
: <math>v_A = \frac{B}{\left(4\pi n_i m_i\right)^\frac{1}{2}} \approx 2.18 \times 10^{11}\,\frac{B}{\left(\mu n_i\right)^\frac{1}{2}}\ \mbox{cm/s}</math> in [[cgs]] units,
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