va_

plasmapy.formulary.va_(

B: Quantity,

density: (Unit('1 / m3'), Unit('kg / m3')),

ion: str | int | integer | Particle | CustomParticle | Quantity | None = None,

*,

mass_numb: int | None = None,

Z: float | None = None,

) → Quantity

Alias to Alfven_speed.