Journal
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
Volume 120, Issue 1, Pages 101-112Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014JA020459
Keywords
Kappa distribution; Cairns distribution; kinetic Alfven wave; compressive soliton; rarefactive soliton; Sagdeev potential
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Funding
- Higher Education Commission (HEC), Pakistan [20-1886/RD10]
- NSF [AGS1138720, AGS1242331]
- BK21-Plus grant from National Research Foundation (NRF) by Ministry of Education of Korea
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1242331] Funding Source: National Science Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1138720] Funding Source: National Science Foundation
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The present work discusses the effects of non-Maxwellian electron distributions on kinetic Alfven waves in low-beta plasmas. Making use of the two-potential theory and employing the Sagdeev potential approach, the existence of solitary kinetic Alfven waves having arbitrary amplitude is investigated. It is found that the use of non-Maxwellian population of electrons in the study of kinetic Alfven waves leads to solutions corresponding to solitary structures that do not exist for Maxwellian electrons. The present investigation solves the riddle of plasma density fluctuations associated with strong electromagnetic perturbations observed by the Freja satellite. The present findings can also be applied to regions of space where various satellite missions have observed the presence of suprathermal populations of plasma species and where the low assumption is valid
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