The Alfvén Mach number (also known as the Alfvén number, Alfvénic Mach number, and magnetic Mach number; MA or MM) is a dimensionless quantity representing the ratio of the relative velocity of a fluid to the local Alfvén speed. It is used in plasma physics, where it is analogous to the Mach number but based on Alfvén waves rather than sound waves.
The Alfvén Mach number (also known as the Alfvén number, Alfvénic Mach number, and magnetic Mach number; MA or MM) is a dimensionless quantity representing the ratio of the relative velocity of a fluid to the local Alfvén speed. It is used in plasma physics, where it is analogous to the Mach number but based on Alfvén waves rather than sound waves.
Source: Wikipedia "Alfvén Mach number" · CC BY-SA 4.0
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