Equations of State for Collisionless Guide-Field Reconnection

Lê, A.; Egedal, J.; Daughton, W.; Fox, W.; Katz, N.

doi:10.1103/physrevlett.102.085001

Cited by 99 publications

(164 citation statements)

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“…Pointing along the electric field that drives the current, they cause particle acceleration, which amplifies the current, generates energetic particles, and cause a number of secondary effects that affect the stability of the plasma in the current sheet. The role of guide fields in collisionless magnetic reconnection and the various effects it may cause have in the past decade been thoroughly investigated in numerical simulations both for guide fields perpendicular (e.g., Ricci et al, 2003) and parallel (e.g., Pritchett, 2005;Cassak et al, 2007;Egedal et al, 2008;Le et al, 2009) to the sheet current.…”

Section: Discussionmentioning

confidence: 99%

Magnetic guide field generation in collisionless current sheets

2010

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Abstract. In thin ( < few λ i ) collisionless current sheets in a space plasma like the magnetospheric tail or magnetopause current layer, magnetic fields can grow from thermal fluctuation level by the action of the non-magnetic Weibel instability (Weibel, 1959). The instability is driven by the counterstreaming electron inflow from the "ion diffusion" (ion inertial Hall) region into the inner current (electron inertial) region after thermalisation by the two-stream instability. Under magnetospheric tail conditions it takes ∼50 e-folding times (∼100 s) for the Weibel field to reach observable amplitudes |b W | ∼ 1 nT. In counter-streaming inflows these fields are of guide field type.

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Section: Discussionmentioning

confidence: 99%

Magnetic guide field generation in collisionless current sheets

2010

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“…We use Liouville's theorem together with the single particle constants of motion to derive a simple analytical form for the electron distribution function inside the reconnection region [15]. In collaboration with Dr. W Daughton at Los Alamos National Laboratory and Prof. J Drake at the University of we have validated our theory directly against their numerical distribution functions [17,19]. Furthermore, by taking moments of the electron distributions, we have derived new equations of state for the parallel and perpendicular electron pressures.…”

Section: Equation Of State For Guide-field Reconnectionmentioning

confidence: 99%

“…Another set of significant results is derived from a new theoretical model for the electron dynamics during reconnection [17], which was inspired by experimental observation in VTF. In the following paragraphs we described how this theory was born out of the experimental observations.…”

Section: Equation Of State For Guide-field Reconnectionmentioning

confidence: 99%

Final Report for DoE Grant DE-FG02-06ER54878, Laboratory Studies of Reconnection in Magnetically Confined Plasmas

Egedal-Pedersen¹

2010

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“…An anisotropic electron pressure with p || > p ⊥ within the reconnection region was first reported by Øieroset et al (2002). This anisotropy was analytically and numerically accounted for Egedal et al (2005), Egedal et al (2008), Le et al (2009, Le et al (2010) and Ohia et al (2012) as resulting from electron trapping by magnetic mirror forces and parallel electric fields.…”

Section: Plasma Phenomena As Measured In Three Dimensionsmentioning

confidence: 99%

Multipoint observations of plasma phenomena made in space by Cluster

et al. 2015

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Plasmas are ubiquitous in nature, surround our local geospace environment, and permeate the universe. Plasma phenomena in space give rise to energetic particles, the aurora, solar flares and coronal mass ejections, as well as many energetic phenomena in interstellar space. Although plasmas can be studied in laboratory settings, it is often difficult, if not impossible, to replicate the conditions (density, temperature, magnetic and electric fields, etc.) of space. Single-point space missions too numerous to list have described many properties of near-Earth and heliospheric plasmas as measured both in situ and remotely (see http://www.nasa.gov/missions/#.U1mcVmeweRY for a list of NASA-related missions). However, a full description of our plasma environment requires three-dimensional spatial measurements. Cluster is the first, and until data begin flowing from the Magnetospheric Multiscale Mission (MMS), the only mission designed to describe the three-dimensional spatial structure of plasma phenomena in geospace. In this paper, we concentrate on some of the many plasma phenomena that have been studied using data from Cluster. To date, there have been more than 2000 refereed papers published using Cluster data but in this paper we will, of necessity, refer to only a small fraction of the published work. We have focused on a few basic plasma phenomena, but, for example, have not dealt with most of the vast body of work describing dynamical phenomena in Earth's magnetosphere, including the dynamics of current sheets in Earth's magnetotail and the morphology of the dayside high latitude cusp. Several review articles and special publications are available that describe aspects of that research in detail and interested readers are referred to them (see for example, Escoubet et al.

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Equations of State for Collisionless Guide-Field Reconnection

Cited by 99 publications

References 10 publications

Magnetic guide field generation in collisionless current sheets

Magnetic guide field generation in collisionless current sheets

Final Report for DoE Grant DE-FG02-06ER54878, Laboratory Studies of Reconnection in Magnetically Confined Plasmas

Multipoint observations of plasma phenomena made in space by Cluster

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