期刊
PHYSICS OF PLASMAS
卷 23, 期 9, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.4962500
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资金
- National Research Foundation of Korea [NRF-2013M1A3A3A02041911, 2014M1A3A3A02034585]
- National Research Foundation of Korea [2013M1A3A3A02041911, 2014M1A3A3A02034585] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Generation of coherent ion acoustic solitary waves (IASWs) in inhomogeneous plasmas by an odd eigenmode (OEM) of electron holes (EHs) is investigated using 1D electrostatic particle-in-cell (PIC) simulations. The OEM oscillates at a frequency comparable to the trapped electron bouncing frequency, as also demonstrated by Lewis' theoretical formalism about the linear eigenmode in Bernstein-Greene-Kruskal (BGK) equilibrium. The density gradient in the inhomogeneous plasmas causes asymmetry in the EH potential structure associated with the OEM, whose amplitude grows rapidly as it propagates through the density gradient region. As the ions interact with this asymmetric potential, which oscillates slowly enough for the ions to respond, they are ejected to the lower density side with a larger potential amplitude, forming a chain of IASWs coherently with the oscillation of the OEM. Published by AIP Publishing.
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