Nonlinear two‐stream instabilities as an explanation for auroral bipolar wave structures

Goldman, M. V.; Oppenheim, M. M.; Newman, D. L.

doi:10.1029/1999gl900435

Cited by 165 publications

(169 citation statements)

References 13 publications

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“…[35,36]), and ES whistler waves have been shown to be responsible for decay of electron holes formed in simulations of beam-plasma systems [37,38]. In VTF it was found that during reconnection events where holes were not observed, there was nonetheless still substantial electrostatic turbulence in this same frequency range f LH < f < f ce [23], termed "lower-hybrid" modes since the frequency spectrum peaked at a few times f LH .…”

Section: Electrostatic Vs Electromagnetic Responsementioning

confidence: 96%

Observations of electron phase-space holes driven during magnetic reconnection in a laboratory plasma

et al. 2012

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This work presents detailed experimental observations of electron phase-space holes driven during magnetic reconnection events on the Versatile Toroidal Facility. The holes are observed to travel on the order of or faster than the electron thermal speed, and are of large size scale, with diameter of order 60 Debye lengths. In addition, they have 3-D spheroidal structure with approximately unity aspect ratio. We estimate the direct anomalous resistivity due to ion interaction with the holes and find it to be too small to affect the reconnection rate; however the holes may play a role in reining in a tail of accelerated electrons, and they indicate the presence of other processes in the reconnection layer, such as electron energization and electron beam formation.

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Section: Electrostatic Vs Electromagnetic Responsementioning

confidence: 96%

Observations of electron phase-space holes driven during magnetic reconnection in a laboratory plasma

et al. 2012

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“…Although there is no simple explicit expression for n p (φ) that can be obtained with the distribution (17), one can use an expansion for small φ to analyse the behaviour of the passing electrons (Krasovsky et al, 1997),…”

Section: Passing Electronsmentioning

confidence: 99%

Modeling stretched solitary waves along magnetic field lines

Muschietti

Roth

Carlson

et al. 2002

Nonlin. Processes Geophys.

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Abstract.A model is presented for a new type of fast solitary waves which is observed in downward current regions of the auroral zone. The three-dimensional, coherent structures are electrostatic, have a positive potential, and move along the magnetic field lines with speeds on the order of the electron drift. Their parallel potential profile is flattened and cannot fit to the Gaussian shape used in previous work. We develop a detailed BGK model which includes a flattened potential and an assumed cylindrical symmetry around a centric magnetic field line. The model envisions concentric shells of trapped electrons slowly drifting azimuthally while bouncing back and forth in the parallel direction. The electron dynamics is analysed in terms of three basic motions that occur on different time scales characterized by the cyclotron frequency e , the bounce frequency ω b , and the azimuthal drift frequency ω γ . The ordering e ω b ω γ is required. Self-consistent distribution functions are calculated in terms of approximate constants of motion. Constraints on the parameters characterizing the amplitude and shape of the stretched solitary wave are discussed.

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“…The negative potential ESWs have been interpreted in terms of ion solitary waves or solitons (Koskinen et al,904 G. S. Lakhina et al: Study of nonlinear ion-and electron-acoustic waves been commonly interpreted in terms of as Bernstein-GreeneKruskal (BGK) modes (Bernstein et al, 1957;Muschietti et al, 1999;Jovanovic and Shukla, 2000;Chen et al, 2005). Other favorite interpretations for these ESWs are based on the nonlinear evolution of a bump-on-tail instability/electron two stream instability (Omura et al, 1996;Kojima et al, 1997;Goldman et al, 1999), and electron-acoustic solitary waves (Pottelette et al, 1990;Dubouloz et al, 1991Dubouloz et al, , 1993Lakhina, 2001, 2004;Tagare et al, 2004. For a detailed discussion of various models, one can refer to Lakhina et al (2000Lakhina et al ( , 2004.…”

Section: Introductionmentioning

confidence: 99%

Study of nonlinear ion- and electron-acoustic waves in multi-component space plasmas

Lakhina

Singh

Kakad

et al. 2008

Nonlin. Processes Geophys.

102

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Abstract. Large amplitude ion-acoustic and electronacoustic waves in an unmagnetized multi-component plasma system consisting of cold background electrons and ions, a hot electron beam and a hot ion beam are studied using Sagdeev pseudo-potential technique. Three types of solitary waves, namely, slow ion-acoustic, ion-acoustic and electron-acoustic solitons are found provided the Mach numbers exceed the critical values. The slow ion-acoustic solitons have the smallest critical Mach numbers, whereas the electron-acoustic solitons have the largest critical Mach numbers. For the plasma parameters considered here, both type of ion-acoustic solitons have positive potential whereas the electron-acoustic solitons can have either positive or negative potential depending on the fractional number density of the cold electrons relative to that of the ions (or total electrons) number density. For a fixed Mach number, increases in the beam speeds of either hot electrons or hot ions can lead to reduction in the amplitudes of the ion-and electron-acoustic solitons. However, the presence of hot electron and hot ion beams have no effect on the amplitudes of slow ion-acoustic modes. Possible application of this model to the electrostatic solitary waves (ESWs) observed in the plasma sheet boundary layer is discussed.

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Nonlinear two‐stream instabilities as an explanation for auroral bipolar wave structures

Cited by 165 publications

References 13 publications

Observations of electron phase-space holes driven during magnetic reconnection in a laboratory plasma

Observations of electron phase-space holes driven during magnetic reconnection in a laboratory plasma

Modeling stretched solitary waves along magnetic field lines

Study of nonlinear ion- and electron-acoustic waves in multi-component space plasmas

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