Abstract
| Original language | English |
|---|---|
| Pages (from-to) | 192-199 |
| Number of pages | 8 |
| Journal | Physica Scripta |
| Volume | 2004 |
| Issue number | T107 |
| DOIs | |
| Publication status | Published - 2004 |
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Keywords
- waves
- wave propagation
- plasma dynamics
- plasma flow
- ion holes
- Vlasov equation
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Trapping of Langmuir waves in ion holes. / Eliasson, Bengt; Shukla, Padma Kant.
In: Physica Scripta, Vol. 2004, No. T107, 2004, p. 192-199.Research output: Contribution to journal › Article
TY - JOUR
T1 - Trapping of Langmuir waves in ion holes
AU - Eliasson, Bengt
AU - Shukla, Padma Kant
PY - 2004
Y1 - 2004
N2 - We present analytical and numerical studies of a new electron plasma wave interaction mechanism which reveals trapping of Langmuir waves in ion holes associated with non-isothermal ion distribution functions. This Langmuir-ion hole interaction is a unique kinetic phenomenon, which is governed by two second-order nonlinear differential equations in which the Langmuir wave electric field and ion hole potential are coupled in a complex fashion. Numerical analyses of our nonlinearly coupled differential equations exhibit trapping of localized Langmuir wave envelops in ion holes which are moving with sub- or super ion thermal speeds. The resulting ambipolar potential of the ion hole is essentially negative, giving rise to bipolar slow electric fields. The theoretical predictions are investigated numerically with a fully kinetic Vlasov code, and are found to be in qualitative agreement with the numerical results. Furthermore, a process for the generation of Langmuir waves by colliding ion holes is studied numerically.
AB - We present analytical and numerical studies of a new electron plasma wave interaction mechanism which reveals trapping of Langmuir waves in ion holes associated with non-isothermal ion distribution functions. This Langmuir-ion hole interaction is a unique kinetic phenomenon, which is governed by two second-order nonlinear differential equations in which the Langmuir wave electric field and ion hole potential are coupled in a complex fashion. Numerical analyses of our nonlinearly coupled differential equations exhibit trapping of localized Langmuir wave envelops in ion holes which are moving with sub- or super ion thermal speeds. The resulting ambipolar potential of the ion hole is essentially negative, giving rise to bipolar slow electric fields. The theoretical predictions are investigated numerically with a fully kinetic Vlasov code, and are found to be in qualitative agreement with the numerical results. Furthermore, a process for the generation of Langmuir waves by colliding ion holes is studied numerically.
KW - waves
KW - wave propagation
KW - plasma dynamics
KW - plasma flow
KW - ion holes
KW - Vlasov equation
UR - http://iopscience.iop.org/1402-4896/2004/T107/037
U2 - 10.1238/Physica.Topical.107a00192
DO - 10.1238/Physica.Topical.107a00192
M3 - Article
VL - 2004
SP - 192
EP - 199
JO - Physica Scripta
JF - Physica Scripta
SN - 0031-8949
IS - T107
ER -