Fig. 17

Energy dependencies of the amplitude GD₁ (0 hr) and TD₁ (6 hr) derived from the observed S_iD₁ ’s whose phases are shown in Fig. 12 (Ref. 3). The symbols are the same as in Fig. 12. The amplitude for \(\lambda \ne 0^\circ \) is converted into that at the equator by multiplying a provisional correction factor \(1/\cos {\rm{\lambda }}\) although its latitude dependence cannot be exactly expressed by cos γ as it contains the north-south asymmetric term (sin γ).