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    The use of the power density for identifying reconnection regions

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    Authors
    Hamrin, M.
    Andersson, L.
    Vaivads, A.
    Pitkanen, T.
    Gunell, H.
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    Discipline
    Physical sciences
    Audience
    Scientific
    Date
    2015
    Metadata
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    Description
    In the vicinity of magnetic reconnection, magnetic energy is transferred into kinetic energy. A reconnection region hence corresponds to a load, and it should manifest itself as large and positive values of the power density, E·J ≫ 0, where E is the electric field and J the current density. In this article we analyze Cluster plasma sheet data from 2001–2004 to investigate the use of the power density for identifying possible magnetic reconnection events from large sets of observed data. From theoretical arguments we show that an event with inline image pW/m3 in the Earth's magnetotail observed by the Cluster instruments (X <− 10RE and inline image) is likely to be associated with reconnection. The power density can be used as a primary indicator of potential reconnection regions, but selected events must be reviewed separately to confirm any possible reconnection signatures by looking for other signatures such as Hall electric and magnetic fields and reconnection jets. The power density can be computed from multispacecraft data, and we argue that the power density can be used as a tool for identifying possible reconnection events from large sets of data, e.g., from the Cluster and the Magnetospheric Multiscale missions.
    Citation
    Hamrin, M.; Andersson, L.; Vaivads, A.; Pitkanen, T.; Gunell, H. (2015). The use of the power density for identifying reconnection regions. , Journal of Geophysical Research A: Space Physics, Vol. 120, Issue 10, 8644-8662, DOI: 10.1002/2015JA021535.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/2717
    doi: http://dx.doi.org/10.1002/2015JA021535
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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