Soliton Formation in Neutral Ion Gases: Exact Analysis
  It is shown here that in neutral ion gases the thermal energy transport can occur in the form of new types of thermal soliton waves. The solitons can form under a vanishing net heating function, and for a quadratic net heating. It is predicted that these solitons play an important role in a diversity of terrestrial and astrophysical phenomena. We claim that the reported soliton waves can be observed under ordinary laboratory conditions. 
Babur M. Mirza
nlin.PS astro-ph.EP math.AP