Nonlinear effects associated with the dispersive Alfven waves in space plasmas

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.3304182· OSTI ID:21347192

Kumar, Sanjay; Sharma, R P ^[1]

---

1. Centre for Energy Studies, Indian Institute of Technology, Delhi 110016 (India)

This paper presents the model equations governing the nonlinear dynamics of the dispersive Alfven wave (DAW) in the low-beta plasmas (beta<<m{sub e}/m{sub i}; known as inertial Alfven waves) applicable to solar corona and intermediate-beta plasmas (m{sub e}/m{sub i}<<beta<<1; kinetic Alfven waves) applicable to solar wind in Earth's magnetosphere. The pump DAW is perturbed by a low-frequency fast wave (FW). When the ponderomotive nonlinearities are incorporated in the DAW and FW dynamics, the model equations of DAW and FW turn out to be the modified Zakharov system of equations. Growth rate and threshold field for modulational (filamentation) instability have been calculated. The dependence of the growth rate on the perturbation wave number and the pump wave parameters (such as perpendicular wave number) has also been presented.

• OSTI ID: 21347192
• Journal Information: Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 3 Vol. 17; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ALFVEN WAVES
ATMOSPHERES
EARTH ATMOSPHERE
EARTH MAGNETOSPHERE
HYDROMAGNETIC WAVES
INSTABILITY
NONLINEAR PROBLEMS
PLASMA
PLASMA INSTABILITY
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR CORONA
SOLAR WIND
STELLAR ACTIVITY
STELLAR ATMOSPHERES
STELLAR CORONAE
STELLAR WINDS