Propagation in multicomponent plasmas

Smith, Robert L.; Brice, Neil

doi:10.1029/jz069i023p05029

Cited by 249 publications

(127 citation statements)

References 5 publications

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“…The literature devoted to the theoretical discussion of relevant acceleration processes may be grouped into several major categories, which include (1) acceleration by a DC electric Ðeld (Holman 1985 ;Holman & Benka 1992 ;Tsuneta 1995 ;Litvinenko 1996), (2) stochastic acceleration (Smith & Brice 1964 ;Miller 1991Miller , 1997Steinacker & Miller 1992 ;Miller & Vinas 1993 ;Miller & Roberts 1995 ;Miller, Larosa, & Moore 1996 ;Roth & Temerin 1998 ;Kocharov et al 1999), and (3) shock-related acceleration processes (Ellison & Ramaty 1985 ;Decker 1988 ;KraussVarban, Burgess, & Wu 1989 ;Zank & Gaisser 1992 ;Somov & Kosugi 1997 ;Tsuneta & Naito 1998 ;Berezhko & Donald 1999). The references cited here are mainly used as examples and are by no means complete.…”

Section: Introductionmentioning

confidence: 99%

A Source of Energetic Particles Associated with Solar Flares

Wang

et al. 2001

ApJ

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Energetic particles produced at a solar Ñare event are an issue of great theoretical interest. A scenario involving magnetic Ðeld reconnection and newborn ions produced by ionization of neutral atoms in the lower corona is proposed by Wu. A series of two-dimensional hybrid simulations has been carried out to investigate this scenario further, and the results are presented in this paper. It is shown that under certain conditions the proposed process can produce protons with energies in the range of 10È100 MeV with a timescale of 10~4 to 10~3 s in a reconnection layer via the so-called ion pickup process. The acceleration process is sensitive to the ambient magnetic Ðeld. The maximum energy attainable is also discussed in terms of altitudes above the photosphere on the basis of a certain magnetic Ðeld model.

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Section: Introductionmentioning

confidence: 99%

A Source of Energetic Particles Associated with Solar Flares

Wang

et al. 2001

ApJ

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“…Already in one of the first papers on wave propagation in multi-ion component plasmas, Smith and Brice (1964) noted that the ion-ion hybrid (IIH) resonance and cutoff frequencies present in plasmas with two or more ion species carry the information on ion densities. This motivated the development of indirect methods to determine the plasma composition using wave polarization analysis.…”

Section: Introductionmentioning

confidence: 99%

Tunneling and mode conversion of fast magnetosonic waves in the magnetospheres of Earth and Mercury

Kazakov¹,

Fülöp

2014

J. Plasma Phys.

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(Received ?; revised ?; accepted ?. -To be entered by editorial office) Narrow-band linearly polarized waves, having a resonant structure and a peak frequency between the local cyclotron frequency of protons and heavy ions, have been detected in the magnetospheres of Earth and of Mercury. Some of these wave events have been suggested to be driven by linear mode conversion (MC) of the fast magnetosonic waves at the ion-ion hybrid (IIH) resonances. Since the resonant IIH frequency is linked to the plasma composition, solving the inverse problem allows one to infer the concentration of the heavy ions from the measured frequency spectra. In this paper, we identify the conditions when the MC efficiency is maximized in the magnetospheric plasmas and discuss how this can be applied for estimating the heavy ion concentration in the magnetospheres of Earth and Mercury.

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“…Associated pioneer works were published during the same period. Smith and Brice (1964), examine the problem of propagation in any multi-component plasma, and Barrington et al (1965), present results derived from the analysis of the Alouette-1 data. In the latter paper, the measured frequency F lh is related to simultaneous measurements of the electron plasma frequency by the topside sounder in order to estimate ion composition and temperature of the ionosphere under various conditions.…”

Section: Introductionmentioning

confidence: 99%

Lower hybrid resonances stimulated by the four CLUSTER relaxation sounders deep inside the plasmasphere: observations and inferred plasma characteristics

Kougblénou¹,

Lointier²,

Décréau³

et al. 2011

Ann. Geophys.

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Abstract. The frequency range of the WHISPER relaxation sounder instrument on board CLUSTER, 4-80 kHz, has been chosen so as to encompass the electron gyro-frequency, F ce , and the electron plasma frequency, F p , in most regions to be explored. Measurement of those frequencies, which are triggered as resonances by the sounder, provides a direct estimation of in situ fundamental plasma characteristics: electron density and magnetic field intensity. In the late mission phase, CLUSTER penetrated regions deep inside the plasmasphere where F ce and F p are much higher than the upper frequency of the sounder's range. However, they are of the right order of magnitude as to place the lower hybrid frequency, F lh , in the 4-15 kHz band. This characteristic frequency, placed at a resonance of the medium, is triggered by the sounder's transmitter and shows up as an isolated peak in the received spectrum, not present in spectra of naturally occuring VLF waves. This paper illustrates, from analysis of case events, how measured F lh values give access to a plasma diagnostic novel of its kind. CLUSTER, travelling along its orbit, encounters favourable conditions where F ce is increasing and F p decreasing, such that F ce /F p increases from values below unity to values above unity. Measured F lh values thus give access, in turn, to the effective mass, M eff , indicative of plasma ion composition, and to the core plasmasphere electron density value, a parameter difficult to measure. The analysed case events indicate that the estimated quantities (M eff in the 1.0-1.4 range, N e in the 5 × 10 2 -10 4 cm −3 range) are varying with external factors (altitude, L value, geomagnetic activity) in a plausible way. Although covering only a restricted region (mid-latitude, low altitude inner plasmasphere), these measurements are available, sinceCorrespondence to: S. Kougblénou (sena.kougblenou@cnrs-orleans.fr) late 2009, for all CLUSTER perigee passes not affected by eclipses (on average, roughly a third of a total of ∼200 passes per year) and offer multipoint observations previously unavailable in this region.

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Propagation in multicomponent plasmas

Cited by 249 publications

References 5 publications

A Source of Energetic Particles Associated with Solar Flares

A Source of Energetic Particles Associated with Solar Flares

Tunneling and mode conversion of fast magnetosonic waves in the magnetospheres of Earth and Mercury

Lower hybrid resonances stimulated by the four CLUSTER relaxation sounders deep inside the plasmasphere: observations and inferred plasma characteristics

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