Solitary potential structures observed in the magnetosheath by the Cluster spacecraft

Pickett, J. S.; Menietti, J. D.; Gurnett, D. A.; Tsurutani, B. T.; Kintner, P. M.; Klatt, E.; Balogh, A.

doi:10.5194/npg-10-3-2003

Cited by 103 publications

(94 citation statements)

References 24 publications

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“…the broad-band signals, in this spectrogram, are observed to be very similar from one spacecraft to the next, we have been unable to conclusively correlate any one structure as propagating from one spacecraft to the next, but this is the subject of ongoing work and not pertinent to this study. Here we see that the broad-band signals extend up to about 40-60 kHz, which is indicative of the pulses being much shorter in duration (see Pickett et al, 2003) than those from the auroral zone. Indeed, when we look at the 5-msec sample waveform from C4, beginning at 22:25:01.2566 UT (Fig.…”

Section: Ies Examplesmentioning

confidence: 83%

“…The Cluster WBD instrument obtains high resolution waveforms in three different filter bandwidths, providing time resolution between samples varying from 5 to 36.5 µsec (see Gurnett et al, 1997 andPickett et al, 2003 for a full description of the WBD instrument and its sampling characteristics). This allows for the resolution of periodic or single period (pulse) waveforms with extremely short durations.…”

Section: Introductionmentioning

confidence: 99%

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Isolated electrostatic structures observed throughout the Cluster orbit: relationship to magnetic field strength

et al. 2004

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Abstract. Isolated electrostatic structures are observed throughout much of the 4 R E by 19.6 R E Cluster orbit. These structures are observed in the Wideband plasma wave instrument's waveform data as bipolar pulses (one positive and one negative peak in the electric field amplitude) and tripolar pulses (two positive and one negative peak, or vice versa). These structures are observed at all of the boundary layers, in the solar wind and magnetosheath, and along auroral field lines at 4.5-6.5 R E . Using the Wideband waveform data from the various Cluster spacecraft we have carried out a survey of the amplitudes and time durations of these structures and how these quantities vary with the local magnetic field strength. Such a survey has not been carried out before, and it reveals certain characteristics of solitary structures in a finite magnetic field, a topic still inadequately addressed by theories. We find that there is a broad range of electric field amplitudes at any specific magnetic field strength, and there is a general trend for the electric field amplitudes to increase as the strength of the magnetic field increases over a range of 5 to 500 nT. We provide a possible explanation for this trend that relates to the structures being Bernstein-GreeneKruskal mode solitary waves. There is no corresponding dependence of the duration of the structures on the magnetic field strength, although a plot of these two quantities reveals the unexpected result that with the exception of the magnetosheath, all of the time durations for all of the other regions are comparable, whereas the magnetosheath time durations clearly are in a different category of much smaller time duration. We speculate that this implies that the structures are much smaller in size. The distinctly different pulse durations for the magnetosheath pulses indicate the possibility that the pulses are generated by a mechanism which is different from the mechanism operating in other regions.

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Section: Ies Examplesmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Isolated electrostatic structures observed throughout the Cluster orbit: relationship to magnetic field strength

et al. 2004

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“…Analysis of the high time resolution of the plasma wave data from GEOTAIL have shown that BEN in the plasma sheet boundary layer actually consists of short electrostatic solitary waves (ESWs) whose Fourier spectrum give rises to the broadband nature of the noise (Matsumoto et al, 1994). ESWs have been observed at/in the bow shock (Bale et al, 1998), the magnetosheath (Pickett et al, 2003), the polar cap boundary layer (Franz et al, 1998;Tsurutani et al, 1998), and in the auroral acceleration region (Ergun et al, 1998;Bounds et al, 1999). It is interesting to note that the electrostatic solitary structures are observed in the electric field parallel to the background magnetic field, are usually bipolar or tripolar, and their amplitudes are typically a few mV/m in the plasma sheet boundary layer, but they can be as large as 200 mV/m at polar altitudes (Cattell et al, 1999).…”

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.

105

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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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“…Only some immediately relevant references will be given below, there being no hope of doing this extended domain any semblance of justice. Solitary waves seen in space have usually been in the form of bipolar pulses in the electric field or humps and dips in the electrostatic potential and observed in many parts of the magnetosphere: for instance, the auroral region (Bounds et al 1999), the bow shock (Bale et al 1998), the magnetosheath (Pickett et al 2003), and the plasma sheet boundary region (Matsumoto et al 1994;Frantz et al 1998), to quote just a selected few.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear electrostatic modes in astrophysical plasmas with charged dust distributions

Verheest

Yaroshenko

2009

A&A

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Context. Most theoretical investigations of wave phenomena in dusty plasmas have treated charged dust as additional heavy negative ions in standard multispecies models. Many dusty plasma experiments use monodisperse grains, but charged (and neutral) grains in space environments come in a whole range of sizes and compositions, hence in masses and charges. Dust density distributions having a power-law decay with size are often observed in planetary rings. Aims. There is a need to investigate larger solitary structures, since wave descriptions involving charged dust distributions have usually been limited to linear or weakly nonlinear modes. Methods. Sagdeev pseudopotential methods describe large-amplitude solitary waves in a co-moving reference frame and are adapted to include dust distributions, using mass and charge, or alternatively size, as additional variables. Observed power-law distributions lead to descriptions involving hypergeometric functions. Results. Lower limits for possible solitary wave velocities follow from requiring that the Sagdeev pseudopotentials have a local maximum for the undisturbed conditions, whereas upper limits come from ensuring that dust densities remain real. Nonlinear amplitudes increase with solitary wave velocities and relative electron temperature. Under similar plasma conditions, dust size distributions admit slower solitary wave solutions, with correspondingly smaller amplitudes than given by monodisperse dust models. For typical planetary ring conditions, the difference can be quite appreciable.

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Solitary potential structures observed in the magnetosheath by the Cluster spacecraft

Cited by 103 publications

References 24 publications

Isolated electrostatic structures observed throughout the Cluster orbit: relationship to magnetic field strength

Isolated electrostatic structures observed throughout the Cluster orbit: relationship to magnetic field strength

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

Nonlinear electrostatic modes in astrophysical plasmas with charged dust distributions

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