هموگش ِ درهازش
Fr.: équation d'induction
In magnetohydrodynamics, an equation that describes the transport of plasma and magnetic
field lines over time:
∂B/∂t = ∇ x (v x B) +
is the → magnetic induction, v is the
plasma velocity, and η = (μσ)-1 the
→ magnetic diffusivity.
The first term on the right side represents → magnetic advection
and the second term → magnetic diffusion.
The induction equation can also be expressed as:
∂B/∂t = -(v.∇)B + (B.∇)v -
where the terms of the right-hand side stand for advection,
stretching, and compression, respectively. Among these terms, net
increase of the field can be done only through the stretching and
→ induction; → equation.