The Induction Arrow is a graphical representation of tipper T. The real and imaginary parts of complex tipper components Tx,Ty can be combined to form +/- (Txr,Tyr) and +/- (Txi,Tyi). In Parkinson convention -(Txr,Tyr) is chosen as Induction Arrow, which tends to point toward regions of higher conductivity. Thus Induction Arrow magnitude can be defined as:
Chave, A.D. and Jones, A.G. eds., 2012. The magnetotelluric method: Theory and practice. Cambridge University Press.
Wight, D.E., 1987. Society of Exploration Geophysicists MT/EMAP Data Interchange Standard.