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Dynamics and waves near multiple magnetic null points in reconnection diffusion region
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2009 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 114, no 7, A07216- p.Article in journal (Refereed) Published
Abstract [en]

Identifying the magnetic structure in the region where the magnetic field lines break and how reconnection happens is crucial to improving our understanding of three-dimensional reconnection. Here we show the in situ observation of magnetic null structures in the diffusion region, the dynamics, and the associated waves. Possible spiral null pair has been identified near the diffusion region. There is a close relation among the null points, the bipolar signature of the Z component of the magnetic field, and enhancement of the flux of energetic electrons up to 100 keV. Near the null structures, whistler-mode waves were identified by both the polarity and the power law of the spectrum of electric and magnetic fields. It is found that the angle between the fans of the nulls is quite close to the theoretically estimated maximum value of the group-velocity cone angle for the whistler wave regime of reconnection.

Place, publisher, year, edition, pages
2009. Vol. 114, no 7, A07216- p.
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Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-148298DOI: 10.1029/2008JA013197ISI: 000268095200001OAI: oai:DiVA.org:uu-148298DiVA: diva2:401817
Available from: 2011-03-04 Created: 2011-03-04 Last updated: 2017-12-11Bibliographically approved

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Vaivads, Andris

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Swedish Institute of Space Physics, Uppsala Division
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