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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
physics and astronomy
Freak waves in white dwarfs and magnetars
Physics of Plasmas, Volume 19, No. 12, Article 122903, Year 2012
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Description
We report properties of ion acoustic freak waves that propagate in a plasma composed of warm ions and ultrarelativistic electrons and positrons. The dynamics of the nonlinear freak waves is governed by the nonlinear Schrödinger equation. The possible region for the freak waves to exist is defined precisely for typical parameters of white dwarfs and magnetars corona. It is found that for low wave number, the nonlinear ion-acoustic wave packets are structurally stable in magnetars corona than in white dwarfs. However, for large wave numbers the situation is opposite. The critical wave number threshold (kc), which indicates where the modulational instability sets in, is defined for both applications. It is seen that near to kc the freak wave amplitude becomes high, but it decreases whenever we stepped away from kc. For the wave numbers close to kc, the increase of the unperturbed density ratio of positrons-to-electrons (β) would lead to increase the freak wave amplitude, but for larger wave numbers the amplitude decreases with the increase of β. © 2012 American Institute of Physics.
Authors & Co-Authors
Sabry, Refaat
Egypt, New Damietta
Faculty of Science
Saudi Arabia, Al Kharj
Prince Sattam Bin Abdulaziz University
Germany, Bochum
Ruhr-universitat Bochum
Moslem, Waleed M.
Germany, Bochum
Ruhr-universitat Bochum
Egypt, Port Said
Faculty of Science
Egypt, El Shorouk
Centre for Theoretical Physics
Shukła, Padma Kant
Germany, Bochum
Ruhr-universitat Bochum
United States, La Jolla
Center for Energy Research
Statistics
Citations: 47
Authors: 3
Affiliations: 6
Identifiers
Doi:
10.1063/1.4772058
ISSN:
1070664X