Nonlinear Whistler-Mode Interaction and Triggered Emissions in the Magnetosphere: A Review

Matsumoto, Hiroshi

doi:10.1007/978-94-009-9500-0_13

Cited by 60 publications

(36 citation statements)

References 65 publications

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“…We will refer to a review paper by Matsumoto (1979) where the references to the most important studies on this subject fulfilled by that time can be found. Recently, the interest to this issue has been recommenced in connection with the problem of spacecraft safe functioning in the Earth's radiation belts.…”

Section: Discussionmentioning

confidence: 99%

On the nature of particle energization via resonant wave-particle interaction in the inhomogeneous magnetospheric plasma

Shklyar

2011

Ann. Geophys.

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Abstract. When a quasi-monochromatic wave propagating in an inhomogeneous magnetoplasma has sufficiently large amplitude, there exist phase-trapped resonant particles whose energy increases or decreases depending on the "sign" of inhomogeneity. The variation of energy density of such particles can greatly exceed the wave energy density which contradicts energy conservation under the prevalent assumption that the wave serves as the energy source or sink. We show that, in fact, the energy increase (or decrease) of phasetrapped particles is related to energy transfer from (to) phase untrapped particles, while the wave basically mediates the energization process. Virtual importance of this comprehension consists in setting proper quantitative constraints on attainable particle energy. The results have immediate applications to at least two fundamental problems in the magnetospheric physics, i.e. particle dynamics in the radiation belts and whistler-triggered emissions.

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Section: Discussionmentioning

confidence: 99%

On the nature of particle energization via resonant wave-particle interaction in the inhomogeneous magnetospheric plasma

Shklyar

2011

Ann. Geophys.

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“…For example, MATSUMOTO (1979) gives the following condition for electrons to stay in resonance with a wave of frequency variation dw/dt and �; =-2�! * /F vR( 1 + f.?…”

Section: Discussionmentioning

confidence: 99%

Magnetospheric VLF line radiation observed at Halley, Antarctica

Matthews

Yearby

1981

Planetary and Space Science

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Spectrograms of broad-band ELF/VLF goniometer data obtained from ground based measurements made at Halley, Antarctica (L 0 =4.3, con jugate near St. Anthony, Newfoundland) have shown the presence of discrete line radiation of magnetospheric origin, in the frequency range 1-4 kHz. The properties of this radiation are broadly similar to Power Line Harmonic Radia tion (PLHR), studied from ground based observations made at Siple, Antarc tica (L =4.1, conjugate-Roberval, Quebec), although there are some interesting differences. Line radiation observed at Halley, is never regularly spaced in frequency by 120 Hz, as one may expect if signals from the Newfoundland power distribution system (60 Hz fundamental) are entering the magneto sphere, and being amplified. Instead, frequency spacings are widely distributed about mean values between 50 to 90 Hz. The lines are observed to trigger emissions and often exhibit 2 hop amplitude modulation, which demonstrates that they are of magnetospheric origin. Events occur mostly in quiet to moderate geomagnetic conditions, and during the late af ternoon period of local time. Arrays of lines are often observed to drift upwards together in fre quency. Line bandwidths are 20-30 Hz-much larger than the bandwidths of locally generated induction lines. We show that the line spacing of ,.., 80 Hz is too large to correspond to sideband separation for waves of equatorial field strength ,.., 10 pT, and we investigate the conditions required for effective particle trapping by the wave array, of the type described by NuNN (J. Plasma Phys., 11, 189, 1974). It is proposed that the line radiation either originates in the signals which enter the magnetosphere from Newfoundland, or is 'naturally' generated, possibly by a linear instability which takes place if the electron distribution is unstable in restricted ranges of wave frequency and wave number.

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“…The description of such motion was studied in detail by many authors (see for instance, Karpman 1974;Matsumoto 1979). In the presence of a finite amplitude electromagnetic wave, particles having a velocity around resonant velocity are trapped by the wave.…”

Section: Trapping Of Particles By An Electromagnetic Wavementioning

confidence: 99%

“…The constant of motion H is equivalent to χ in (Matsumoto 1979;Hoshino & Terasawa 1985). Note that if κ is the same, any pair of u and k have a physical similarity.…”

Section: Trapping Of Particles By An Electromagnetic Wavementioning

confidence: 99%

Acceleration of charged particles by gyroresonant surfing at quasi-parallel shocks

Kuramitsu¹,

Krasnoselskikh²

2005

A&A

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Abstract.We discuss an acceleration mechanism of charged particles by magnetohydrodynamic (MHD) structures, such as quasi-parallel shocks and short-large amplitude magnetic structures (SLAMS). In the presence of electromagnetic waves and an electrostatic electric field, particles are accelerated efficiently in the perpendicular direction to the background magnetic field by the combination of two effects, the trapping of particles by the wave and the dragging by the electrostatic field to keep the resonance condition. This allows particles to propagate downstream even when they initially have smaller kinetic energy than the potential. We show the fundamental properties of this mechanism, referred to as gyroresonant surfing.

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Nonlinear Whistler-Mode Interaction and Triggered Emissions in the Magnetosphere: A Review

Cited by 60 publications

References 65 publications

On the nature of particle energization via resonant wave-particle interaction in the inhomogeneous magnetospheric plasma

On the nature of particle energization via resonant wave-particle interaction in the inhomogeneous magnetospheric plasma

Magnetospheric VLF line radiation observed at Halley, Antarctica

Acceleration of charged particles by gyroresonant surfing at quasi-parallel shocks

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