Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 41, Issue 14, Pages 4851-4858Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2014GL061157
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Funding
- National Science Foundation of China (NSFC) [41104092, 41174122, 41274144]
- China Postdoctoral Science Foundation [2011M500030, 2012T50133]
- Austrian Science Fund (FWF) [I429-N16]
- STFC [ST/H004130/1, ST/G008493/1, ST/K000977/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/H004130/1, ST/G008493/1, ST/K000977/1] Funding Source: researchfish
- UK Space Agency [ST/M003132/1, ST/J004758/1] Funding Source: researchfish
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We present in situ observation of double layer (DL) and associated electron measurement in the subspin time resolution in the separatrix region during reconnection for the first time. The DL is inferred to propagate away from the X line at a velocity of about ion acoustic speed and the parallel electric field carried by the DL can reach -20 mV/m. The electron displays a beam distribution inside the DL and streams toward the X line with a local electron Alfven velocity. A series of electron holes moving toward the X line are observed in the wake of the DL. The identification of multiple similar DLs indicates that they are persistently produced and therefore might play an important role in energy conversion during reconnection. The observation suggests that energy dissipation during reconnection can occur in any region where the DL can reach.
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