Abstract:
The transition of an ion acoustic solitary wave into a “supersoliton,” or a super solitary wave have
been explored in a two electron temperature warm multi-ion plasma using the Sagdeev pseudopotential
technique. It is generally believed that the ion acoustic solitary wave can be transformed to a
super solitary wave only through a double layer. The present work shows that the transition route
of an ion acoustic solitary wave to a super solitary wave is not unique. Depending on the electron
temperature ratio, a regular solitary wave may transform to a super solitary wave either via the double
layer, or through an extra-nonlinear solitary structure whose morphology differs from that of a
regular one. These extra-nonlinear structures are associated with a fluctuation of the charge separation
within the potential profile and are named as “variable solitary waves.” Depending on these
analyses, the upper and lower bounds of a super solitary wave have been deciphered and its existence
domain has been delineated in the parametric space. It reveals that super solitary waves are a
subset of a more generalized class of extra-nonlinear solitary structures called variable solitary
waves.
