Arbitrary amplitude ion-acoustic solitary excitations in the presence of excess superthermal electrons
By N. S. Saini, Ioannis Kourakis, M. Hellberg. 2009
183 citations recorded by the source corpus.
Velocity distribution functions with an excess of superthermal particles are commonly observed in space plasmas, and are effectively modeled by a kappa distribution. They are also found in some laboratory experiments. In this paper we obtain existence conditions for and some characteristics of ion-acoustic solitary waves in a plasma composed of cold ions and -distributed electrons, where 3 / 2 represents the spectral index. As is the case for the usual Maxwell–Boltzmann electrons, only positive potential solitons are found, and, as expected, in the limit of large one recovers the usual range of possible soliton Mach numbers, viz., 1M 1.58. For lower values of , modeling the presence of a greater superthermal component, the range of accessible Mach numbers is reduced. It is found that the amplitude of the largest possible solitons that may be generated in a given plasma corresponding to the highest allowed Mach number for the given plasma composition falls off with decreasing , i.e., an increasing superthermal component. On the other hand, at fixed Mach number, both soliton amplitude and profile steepness increase as is decreased. These changes are seen to be important particularly for 4, i.e., when the electrons have a “hard” spectrum. © 2009 American Institute of Physics. DOI: 10.1063/1.3143036
Subfields: Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/8b9f01505f20c734fe507320cc5b182d6f0ea039
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Astronomy and Astrophysics
In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Kappa Distributions: Theory and Applications in Space Plasmas (2010, background): “The existence conditions and characteristics of ion-acoustic solitary waves have been studied by Abbasi and Pajouh (2008); Saini et al. (2009) and Chuang and Hau (2009) showing that Kappa-distributed electrons are not favorable to the existence of these solitons.”