Electron acoustic waves in double-kappa plasmas: Application to Saturn's magnetosphere

Baluku, T. K.; Hellberg, M. A.; Mace, R. L.

doi:10.1029/2010ja016112

Cited by 82 publications

(85 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The observed distributions of charged particles have been well fitted with a generalized Lorentzian distribution, known as the kappa distribution, since it fits both the thermal as well as the suprathermal parts of the observed energy velocity spectra [ Krimigis et al , ; Hasegawa et al , ; Christon et al , ; Pierrard and Lemaire , ; Maksimovic et al , ; Viñas et al , ; Baluku et al , ]. The spectral index κ is a measure of the slope of the energy spectrum of the suprathermal particles forming the tail of the velocity distribution function; the smaller the value, the more suprathermal particles in the distribution function tail and the harder the energy spectrum.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear kinetic Alfvén waves with non‐Maxwellian electron population in space plasmas

et al. 2015

View full text Add to dashboard Cite

The present work discusses the effects of non-Maxwellian electron distributions on kinetic Alfvén waves in low-beta plasmas. Making use of the two-potential theory and employing the Sagdeev potential approach, the existence of solitary kinetic Alfvén waves having arbitrary amplitude is investigated. It is found that the use of non-Maxwellian population of electrons in the study of kinetic Alfvén 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.

show abstract

Section: Introductionmentioning

confidence: 99%

Nonlinear kinetic Alfvén waves with non‐Maxwellian electron population in space plasmas

et al. 2015

View full text Add to dashboard Cite

show abstract

“…In this section we will give the characteristics of ion waves for parameter values that are typical of the three regions of Saturn's magnetosphere, viz., the inner magnetosphere, intermediate magnetosphere and the outer magnetosphere as given by Shippers et al Table 1 where they mainly used data values obtained on the Cassini outbound trajectory (Baluku et al 2011).…”

Section: Application To Saturn's Magnetospherementioning

confidence: 99%

Ion-acoustic solitons in plasma: an application to Saturn’s magnetosphere

Annou

2015

Astrophys Space Sci

View full text Add to dashboard Cite

Soliton formation in plasma is addressed. Nonlinear acoustic waves in plasma where the combined effects of bounded spherical geometry and the transverse perturbation are dealt with, in two-temperature electron plasma are studied. Using the perturbation method, a spherical KadomtsevPetviashvili equation (SKP) that describes the ion acoustic waves is derived. The plasma is modeled by a kappa distribution function for both electrons components as found in Saturn's magnetosphere. It is found that parameters taken into account have significant effects on the properties of nonlinear waves. The model is applied to Saturn's magnetosphere, where two temperature superthermal electrons are present. Hence, ion acoustic waves are deduced for three regions, namely, the inner, the intermediate and the outer Saturn's magnetosphere. We point out, that this work has been motivated by recent observations of Saturn's magnetosphere.

show abstract

“…This paper forms the basis for a study which aims to study the non-linear properties of electrostatic waves found in Saturn's magnetosphere. 14 …”

Section: Introductionmentioning

confidence: 97%

Particle-in-cell simulations of beam-driven electrostatic waves in a plasma

2012

View full text Add to dashboard Cite

Using a particle-in-cell simulation, the characteristics of electrostatic waves are investigated in a three-electron component plasma including an electron beam. A Maxwellian distribution is used to describe the electron velocities. Three electrostatic modes are excited, namely electron plasma, electron acoustic, and beam-driven waves. These modes have a broad frequency spectrum and have been associated with intense broadband electrostatic noise observed in the Earth's auroral zone. The simulation results compare well with analytical dispersion and growth rate relations. This agreement serves to validate the simulation technique. V C 2012 American Institute of Physics.

show abstract

Electron acoustic waves in double-kappa plasmas: Application to Saturn's magnetosphere

Cited by 82 publications

References 34 publications

Nonlinear kinetic Alfvén waves with non‐Maxwellian electron population in space plasmas

Nonlinear kinetic Alfvén waves with non‐Maxwellian electron population in space plasmas

Ion-acoustic solitons in plasma: an application to Saturn’s magnetosphere

Particle-in-cell simulations of beam-driven electrostatic waves in a plasma

Contact Info

Product

Resources

About