Abstract
Experimental evidence and a theory is presented for the properties of solitary waves which propagate at right angles to a magnetic field in a plasma which contains two classes of ions with a relative drift velocity between them. Two kinds of nonlinear wave motion are seen to exist. One type of wave reduces to the magnetosonic solitary wave as the density of one of the ion components becomes small. The other type of solitary wave appears to be an ion beam wave. For example, if one of the ion components is at rest in the laboratory, the wave velocity approaches a value less than the moving ion velocity. Unlike the magnetosonic solitary wave these waves can have velocities much greater than twice the Alfvén speed.
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