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“Illuminating” electron diffusion regions of collisionless magnetic reconnection using electron agyrotropy

Scudder, Jack ; Daughton, William

Journal of Geophysical Research - Space Physics, 2008-06, Vol.113 (A6), p.A06222-n/a [Periódico revisado por pares]

Washington, DC: American Geophysical Union

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  • Título:
    “Illuminating” electron diffusion regions of collisionless magnetic reconnection using electron agyrotropy
  • Autor: Scudder, Jack ; Daughton, William
  • Assuntos: agyrotropy ; Earth sciences ; Earth, ocean, space ; Electric fields ; Exact sciences and technology ; Magnetic reconnection ; Magnetopause and boundary layers ; Magnetospheric Physics ; reconnection ; Solar Physics, Astrophysics, and Astronomy ; Space Plasma Physics
  • É parte de: Journal of Geophysical Research - Space Physics, 2008-06, Vol.113 (A6), p.A06222-n/a
  • Notas: ArticleID:2008JA013035
    istex:3EE2109142887B626877562607A9F641A4138014
    ark:/67375/WNG-CST1BRDC-B
  • Descrição: Agyrotropy is a scalar measure of the departure of the pressure tensor from cylindrical symmetry about the local magnetic field direction. Ordinarily electrons are well modeled as gyrotropic with very small agyrotropy. Intensified layers of electron agyrotropy are demonstrated to highlight the thin electron gyroradius scale boundary regions adjoining separatrices, X and O lines of full particle simulations of collisionless magnetic reconnection. Examples are presented to show these effects in antiparallel and guide field geometries, pair plasmas, and simulations at a variety of mass ratios, including a hydrogen plasma. Agyrotropy has been determined from the PIC pressure tensor using a new, fast algorithm developed to correct discreteness contributions to the apparent agyrotropy. As a local scalar diagnostic, agyrotropy is shown to be potentially useful with single spacecraft data to identify the crossing or proximity of electron scale current layers, thus providing a kinetic level diagnosis of a given layer's ability to be a possible site of the collisionless reconnection process. Such kinetic tools are certainly complimentary to the other macroscopic signatures of reconnection. Because of the extreme circumstances required for electron agyrotropy, detection of these signatures with framing macroscopic signatures might prove useful for the discovery of new reconnection sites in nature and 3‐D codes of collisionless reconnection. The agyrotropy in the 2‐D PIC codes reflect long‐lived bulges on the distribution function that appear to be organized by the direction and size of slowly evolving perpendicular electric fields in these layers and are not consistent with gyrophase bunching.
  • Editor: Washington, DC: American Geophysical Union
  • Idioma: Inglês
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