Fig. 12
From: Two current systems in the preliminary phase of sudden commencements in the magnetosphere
The type H and L current systems illustrated in the same manner used in Fig. 3 at t = 5.5 min according to the value of \(\epsilon\). The current lines are shown only in the area of \(\beta\)<0.2. The Alfvén-mode current and the fast magnetosonic-mode current are dominant along the current lines denoted by (1) and (2), respectively. The mixture of the two modes appears along the current lines denoted by (3)