Parallel propagation of ion solitons in magnetic flux tubes

John, Z. G.; Hirose, Akira

doi:10.1088/0031-8949/79/04/045502

Cited by 14 publications

(10 citation statements)

References 87 publications

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“…Numerous satellites have measured these non-wave solitons and confirmed the simultaneity between spikelet electric field structures and energetic ion populations (see e.g. Carlqvist and Boström 1970, Cattell et al 1991, Dusenbery et al 1988, Mottez 2001, and references in Ma and Hirose 2009, Temerin et al 1982, Vago et al 1992.…”

Section: Introductionmentioning

confidence: 84%

Non-wave mechanism of transverse ion heating in magnetic flux tubes

John¹,

St.-Maurice²,

Hirose³

2009

Phys. Scr.

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We introduce a new mechanism for ion heating in the plane perpendicular to the magnetic field lines of a magnetic flux tube. The transverse energization is shown to be contributed by the non-wave solitons developed from nonlinear waves in magnetized plasmas. We use a cylindrical geometry in the study. Solitons carry space charges, which produce an electrostatic electric field by means of Gauss's law. For electron solitons, positive ions are accelerated by and gain energy from the radially inward space-charge electric field. Both the bulk kinetic energy and temperature of ions are enhanced from the initial states. For a single train of solitons, the heating effect is insignificant. By contrast, for a dense cluster of soliton sets, the space charges form an electric field, which is proportional to the radius; if the electric field is stochastic with time, ions can be heated efficiently to a level at which the enhanced parameters are observable by the high-resolution satellites, e.g. FAST.

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Section: Introductionmentioning

confidence: 84%

Non-wave mechanism of transverse ion heating in magnetic flux tubes

John¹,

St.-Maurice²,

Hirose³

2009

Phys. Scr.

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“…It deserves to mention again that these three shapes of IA E x structures (i.e., sinusoidal, sawtooth, and spiky/bipolar) are well-known in satellite observations. They were first reported by S3-3 satellite in late 1970s (Temerin et al, 1979) and have thereafter been detected in various regions in geospace by numerous satellites (see a detailed review in Ma and Hirose, 2009a).…”

Section: In the Absence Of Electron Inertia: Parallel-propagating Ia mentioning

confidence: 98%

“…This fact was highlighted in the introduction to Ma and Hirose (2009a) where the authors gave a thorough discussion of prior literature in this field, and showed that there are often differences in nomenclature used by different authors. Table 1.…”

Section: A Preliminary Simulation To Observationsmentioning

confidence: 99%

“…Such electrostatic nonlinear structures were considered to be necessary for auroral electron acceleration up to the observed energies of ∼10 keV. Recently, Ma and Hirose (2009a) performed a parameterized study on IA solitary waves by employing the Sagdeev potential in a magnetized plasma system consisting of warm ions, background electrons, and energetic electrons.…”

Section: Introductionmentioning

confidence: 99%

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Lower-hybrid (LH) oscillitons evolved from ion-acoustic (IA)/ion-cyclotron (IC) solitary waves: effect of electron inertia

Hirose

2010

Nonlin. Processes Geophys.

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Abstract. Lower-hybrid (LH) oscillitons reveal one aspect of geocomplexities. They have been observed by rockets and satellites in various regions in geospace. They are extraordinary solitary waves the envelop of which has a relatively longer period, while the amplitude is modulated violently by embedded oscillations of much shorter periods. We employ a two-fluid (electron-ion) slab model in a Cartesian geometry to expose the excitation of LH oscillitons. Relying on a set of self-similar equations, we first produce, as a reference, the well-known three shapes (sinusoidal, sawtooth, and spiky or bipolar) of parallel-propagating ion-acoustic (IA) solitary structures in the absence of electron inertia, along with their Fast Fourier Transform (FFT) power spectra. The study is then expanded to illustrate distorted structures of the IA modes by taking into account all the three components of variables. In this case, the ion-cyclotron (IC) mode comes into play. Furthermore, the electron inertia is incorporated in the equations. It is found that the inertia modulates the coupled IA/IC envelops to produce LH oscillitons. The newly excited structures are characterized by a normal low-frequency IC solitary envelop embedded by highfrequency, small-amplitude LH oscillations which are superimposed upon by higher-frequency but smaller-amplitude IA ingredients. The oscillitons are shown to be sensitive to several input parameters (e.g., the Mach number, the electronion mass/temperature ratios, and the electron thermal speed). Interestingly, whenever a LH oscilliton is triggered, there occurs a density cavity the depth of which can reach up to 20% of the background density, along with density humps on both sides of the cavity. Unexpectedly, a mode at much lower frequencies is also found beyond the IC band. Future studies areCorrespondence to: J. Z. G. Ma (johnzg.ma@asc-csa.gc.ca) finally highlighted. The appendices give a general dispersion relation and specific ones of linear modes relevant to all the nonlinear modes encountered in the text.

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“…Group-2 presents simple waves in the lower two panels, θ and δ, characterized by the wave packets of hybrid sinusoidal and saw-tooth waveforms [16].…”

Section: Inadequacy Of the Argumentmentioning

confidence: 99%

How is Block’s Central Argument against Functionalism?

2018

ARJASS

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Parallel propagation of ion solitons in magnetic flux tubes

Cited by 14 publications

References 87 publications

Non-wave mechanism of transverse ion heating in magnetic flux tubes

Non-wave mechanism of transverse ion heating in magnetic flux tubes

Lower-hybrid (LH) oscillitons evolved from ion-acoustic (IA)/ion-cyclotron (IC) solitary waves: effect of electron inertia

How is Block’s Central Argument against Functionalism?

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