Waves and Instabilities in Collisionless Shocks

Gurnett, D. A.

doi:10.21236/ada146689

Cited by 4 publications

(2 citation statements)

References 52 publications

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“…Whistlers have a lower threshold energy (section 3.1.1) but need to be located near the electron cyclotron frequency for this threshold to lie near thermal energies. While the largest-amplitude waves at the Earth's bow shock reside at lower frequencies, whistler turbulence has also been reported extensively [Gurnett, 1985].…”

Section: Shock Acceleration Is Generally Split Into 2 Types: Drift Anmentioning

confidence: 99%

Critical issues for understanding particle acceleration in impulsive solar flares

Miller¹,

Cargill²,

Emslie³

et al. 1997

J. Geophys. Res.

478

368

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Abstract. This paper, a review of the present status of existing models for particle acceleration during impulsive solar flares, was inspired by a week-long workshop held in the Fall of 1993 at NASA Goddard Space Flight Center. Recent observations from Yohkoh and the Compton Gamma Ray Observatory, and a reanalysis of older observations from the Solar Maximum Mission, have led to important new results concerning the location, timing, and eificiency of particle acceleration in flares. These are summarized in the first part of the review. Particle acceleration processes are then discussed, with particular emphasis on new developments in stochastic acceleration by magnetohydrodynamic waves and direct electric field acceleration by both sub-and super-Dreicer electric fields. Finally, issues that arise when these mechanisms are incorporated into the large-scale flare structure are considered. Stochastic and super-Dreicer acceleration may occur either in a single large coronal reconnection site or at multiple "fragmented" energy release sites. Sub-Dreicer acceleration requires a highly filamented coronal current pattern. A particular issue that needs to be confronted by all theories is the apparent need for large magnetic field strengths in the flare energy release region.

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Section: Shock Acceleration Is Generally Split Into 2 Types: Drift Anmentioning

confidence: 99%

Critical issues for understanding particle acceleration in impulsive solar flares

Miller¹,

Cargill²,

Emslie³

et al. 1997

J. Geophys. Res.

478

368

View full text Add to dashboard Cite

show abstract

“…........... -d o b .............. '-' Fig. 6c [Gurnett, 1985] was selected in order to indicate that the mechanism of 'oscilliton' generation is more general and should also work in the range of high-frequency waves where the electron dynamics dominates.…”

Section: Structure Of Bi-ion Solitonsmentioning

confidence: 99%

New type of soliton in Bi‐ion plasmas and possible implications

Sauer¹,

Dubinin²,

McKenzie³

2001

Geophysical Research Letters

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Abstract.It is well known that the addition of a second ion population into a proton-electron plasma gives rise to new low-frequency wave modes. Here we investigate stationary structures streaming with sub-fast speed in such a bi-ion plasma. It is shown that a new type of stationary structure occurs as result of mode splitting effects caused by the second ion population. These so-called 'oscillitons' are characterized by an oscillating spatial structure superimposed on the spatial growth or decay associated with the usual single-ion solitons. Examples of the solution of the full non-linear equations describing stationary bi-ion flows are given which show that 'oscillitons' may contribute to a better understanding of diverse low-frequency phenomena observed in the mass loaded plasma environments of Mars, Jupiter and comets.

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Plasma wave signatures of collisionless shocks and the role of plasma wave turbulence in shock formation

Mellott

1986

Advances in Space Research

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Waves and Instabilities in Collisionless Shocks

Cited by 4 publications

References 52 publications

Critical issues for understanding particle acceleration in impulsive solar flares

Critical issues for understanding particle acceleration in impulsive solar flares

New type of soliton in Bi‐ion plasmas and possible implications

Plasma wave signatures of collisionless shocks and the role of plasma wave turbulence in shock formation

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