GUIDED-WAVE PROPAGATION THROUGH GYROMAGNETIC MEDIA 649 



-2.0 -1.5 -1.0 -0.5 0.5 1.0 1.5 2.0 



Fig. 17 — Geometrical exploration of solution curves for the plasma. The 

 dotted regions are excluded by the jjlasma relation; the cross-hatched regions are 

 those in which H{\. a) and H{T{\), a) have unlike sign. Solution curves may lie 

 only in unshaded parts of the 1st and 3rd quadrants, q^ = 0.25, ro ~' 2.0. 



through the unmagnetized plasma, but too small to admit higher modes. 

 The solution curves for ro '^ 2.2 are indicated roughly in Fig. 17. 



In the first quadrant, for a > o-q , a solution curve starts at Xi = 1, 

 0- = 1, passes through the intersection of 7i , (Ib')t and proceeds to 

 infinity as indicated. The formulae in Section 4.21 describe the cor- 

 responding curve near o- = 1, and at o- — > =», showing that the solution 



