Modification of Rotation Frequency
The reconnected magnetic flux at the rational surface is assumed to convected by the local plasma flow. (See Section 3.11.) Hence, changes in the
plasma flow at the rational surface induced by the electromagnetic torques that develop in the vicinity of this
surface will modify the convection velocity. Consequently, the tearing mode's rotation frequency can be written

(3.185) 
where
is the natural frequency of the tearing mode. The natural frequency is defined as the rotation frequency of tearing mode that develops
spontaneously, and does not interact with any external structure (such as a resistive wall or an errorfield).
The previous expression is known as the noslip constraint [4], and has been verified experimentally [12].
It follows from Equations (3.170)
and (3.171) that

(3.186) 