Electron-acoustic solitons in an electron-beam plasma system with kappa-distributed electrons

Ashkbiz Danehkar, Ioannis Kourakis, Manfred A. Hellberg

Research output: Chapter in Book/Report/Conference proceedingOther chapter contribution

Abstract

Interaction of a stream of high-energy electrons with the background plasma plays an important role in the astrophysical phenomena such as interplanetary and stellar bow shock and Earth's foreshock emission. It is not yet fully understood how electrostatic solitary waves are produced at the bow shock. Interestingly, a population of energetic suprathermal electrons were also found to exist in those environments. Previously, we have studied the properties of negative electrostatic potential solitary structures exist in such a plasma with excess suprathermal electrons. In the present study, we investigate the existence conditions and propagation properties of electron-acoustic solitary waves in a plasma consisting of an electron beam fluid, a cold electron fluid, and hot suprathermal electrons modeled by a kappa-distribution function. The Sagdeev pseudopotential method was used to investigate the occurrence of stationary-profile solitary waves. We have determined how the electron-acoustic soliton characteristics depend on the electron beam parameters. It is found that the existence domain for solitons becomes narrower with an increase in the suprathermality of hot electrons, increasing the beam speed, decreasing the beam-to-cold electron population ratio. These results lead to a better understanding of the formation of electron-acoustic solitary waves observed in those space plasma systems characterized by kappa-distributed electrons and inertial drifting (beam) electrons.
Original languageEnglish
Title of host publicationICOPS/BEAMS 2014
Subtitle of host publicationthe 41st IEEE International Conference on Plasma Science and the 20th Internationa Conference on High-Power Particle Beams : Proceedings
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1-1
Number of pages1
ISBN (Print)9781479927111
DOIs
Publication statusPublished - 2014
EventIEEE International Conference on Plasma Science (41st :2014) and the Internationa Conference on High-Power Particle Beams (20th : 2014) - Washington, DC
Duration: 25 May 201429 May 2014

Conference

ConferenceIEEE International Conference on Plasma Science (41st :2014) and the Internationa Conference on High-Power Particle Beams (20th : 2014)
CityWashington, DC
Period25/05/1429/05/14

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