Figure 1
From: Riemann solvers and Alfven waves in black hole magnetospheres
Super Alfvenic Riemann fan. An example of a one dimensional Riemann problem in which the flow is super-Alfvenic inward (to the left). The flow is not super-fast inward. This figure is used to illustrate what happens in a Riemann problem at the interface between two cells in a numerical scheme inside of the IACS. The 5-wave Riemann fan is illustrated (the slow waves are ignored without loss of generality) in order to show the difference of the resolved flux at the interface calculated with a 2-wave HLL Riemann solver and the same calculation performed with a 5-wave HLLI Riemann solver. Outgoing and ingoing are defined in the frame of reference of the plasma.