Electromagnetic effects on the modified two-stream instability

Lemons, Don S.; Gary, S. Peter

doi:10.1029/ja082i016p02337

Cited by 48 publications

(28 citation statements)

References 29 publications

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“…In contrast, Lemons and Gary [1977] retained the sums over Bessel functions and found that although y(k m ,e) was still maximum at small values of B, it remained relatively constant to beyond e < 20°.…”

Section: Forward and Reverse Shocksmentioning

confidence: 99%

“…1) using V as a free parameter Once having found the value of V which maximizes the growth rate, (2.2) can be used to estimate the scale size of the MHD wave required to excite the MTS1. Because the growth rates are relatively insensitive to V SW and R, we first solve (3.1) using parameters typical of 1 AU; a choice which permits comparison with the results of Lemons and Gary [1977], who have used a more general formulation of the MTSI to investigate the formation and structure of the earth's bow shock.…”

Section: Forward and Reverse Shocksmentioning

confidence: 99%

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Microscale instabilities in stream interaction regions

Eviatar¹,

Goldstein²

1980

J. Geophys. Res.

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A theoretical investigation of the microstructure of solar wind stream interaction regions is presented. We discuss the role of several electrostatic kinetic instabilities which may be important within the stream interface and the compression region. Inside of 1 AU the interface is likely to be stable against the electrostatic streaming instabilities considered. Between 1 and 2 AU we argue that the interface will excite the magnetized ion‐ion instability. The compression region is also found to be unstable beyond 1 AU, where the modified two‐stream instability, beam‐cyclotron instability, and ion‐acoustic instability will be important in determining the structure of the compressive pulses as they evolve into forward and reverse shocks. We conclude that the modified two‐stream instability and beam‐cyclotron instability predominately play a role in heating the electrons to the threshold for the ion‐acoustic instability. Various electrostatic plasma waves, ranging in frequency from the lower‐hybrid to harmonics of the electron cyclotron frequency, would be produced by these instabilities. Their signature should also be seen by high time resolution measurements of the temperature of the various plasma species.

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Section: Forward and Reverse Shocksmentioning

confidence: 99%

Section: Forward and Reverse Shocksmentioning

confidence: 99%

Microscale instabilities in stream interaction regions

Eviatar¹,

Goldstein²

1980

J. Geophys. Res.

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“…Magnetic reconnection can saturate the MRI and limit the efficiency of angular momentum transport. This has been demonstrated recently in simulations with explicit resistivity and viscosity; large resistivity leads to efficient reconnection but inefficient angular momentum transport (Lesur and Longaretti, 2007;Fromang et al, 2007).…”

Section: Magnetic Reconnection In Accretion Disksmentioning

confidence: 73%

“…McBride et al, 1972;Lemons and Gary, 1977). This instability is driven by a local ion current unrelated to the diamagnetic drift, a situation that can occur in collisionless shocks, but does not generally apply to the reconnection current sheets.…”

Section: Mechanisms For Anomalous Resistivitymentioning

confidence: 99%

Magnetic Reconnection

Yamada¹

2009

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We review the fundamental physics of magnetic reconnection in laboratory and space plasmas, by discussing results from theory, numerical simulations, observations from space satellites, and the recent results from laboratory plasma experiments. After a brief review of the well-known early work, we discuss representative recent experimental and theoretical work and attempt to interpret the essence of significant modern findings. In the area of local reconnection physics, many significant findings have been made with regard to two-fluid physics and are related to the cause of fast reconnection. Profiles of the neutral sheet, Hall currents, and the effects of guide field, collisions, and micro-turbulence are discussed to understand the fundamental processes in a local reconnection layer both in space and laboratory plasmas. While the understanding of the global reconnection dynamics is less developed, notable findings have been made on this issue through detailed documentation of magnetic self-organization phenomena in fusion plasmas. Application of magnetic reconnection physics to astrophysical plasmas is also briefly discussed.

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“…The occurrence of intense low-frequency ͑20-500 Hz͒ electrostatic noise bursts at the inner boundary of the proton ring current during the magnetic storm of 16-17 December 1971 has been reported by Anderson and Gurnett. The transverse electric field would give rise to a fluctuating magnetic field B Z along the Z-direction given by 27,36 They have suggested that this electrostatic noise may be responsible for the pitch angle scattering and loss of ring current protons from the region near the plasma pause boundary during the storm.…”

Section: ͑12͒mentioning

confidence: 99%

Ring current instabilities excited by the energetic oxygen ions

2007

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The ring current instabilities driven by the energetic oxygen ions are investigated during the magnetic storm. The electrons and protons are considered to have Maxwellian distributions, while energetic oxygen ions are having loss-cone distribution. Dispersion relation for the quasielectrostatic modes with frequencies Ͼ cp ͑proton cyclotron frequency͒ and propagating obliquely to the magnetic field is obtained. Dispersion relation is studied numerically for the storm time ring current parameters and it is found that these instabilities are most prominent during intense storms when the oxygen ions become the dominant constituents of the ring current plasma. For some typical storm-time ring current parameters, these modes can produce quasielectrostatic noise in the range of 17-220 Hz, thus providing a possible explanation of the electrostatic noise observed at the inner boundary of the ring current during magnetic storms. Further, these modes can attain saturation electric fields of the order of 100-500 V / m, and therefore, are expected to scatter O + ions into the loss-cone giving rise to their precipitation into the atmosphere, thus contributing to the ring current decay.

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Electromagnetic effects on the modified two-stream instability

Cited by 48 publications

References 29 publications

Microscale instabilities in stream interaction regions

Microscale instabilities in stream interaction regions

Magnetic Reconnection

Ring current instabilities excited by the energetic oxygen ions

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