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The use of the power density for identifying reconnection regions
Umeå University, Faculty of Science and Technology, Department of Physics.
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2015 (English)In: Journal of Geophysical Research - Space Physics, ISSN 2169-9380, E-ISSN 2169-9402, Vol. 120, no 10, 8644-8662 p.Article in journal (Refereed) PublishedText
Abstract [en]

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<bold>J </bold>>> 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 E<bold>J</bold>20pW/m(3) in the Earth's magnetotail observed by the Cluster instruments (X <- 10R(E) and |Y|less than or similar to 10RE) 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.

Place, publisher, year, edition, pages
2015. Vol. 120, no 10, 8644-8662 p.
Keyword [en]
magnetic reconnection region, power density, plasma sheet, cluster, MMS
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:umu:diva-113869DOI: 10.1002/2015JA021535ISI: 000366135200034OAI: oai:DiVA.org:umu-113869DiVA: diva2:890968
Available from: 2016-01-05 Created: 2016-01-04 Last updated: 2016-01-05Bibliographically approved

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Hamrin, Maria
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