Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 15, Pages 7840-7849Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL070195
Keywords
Asymmetric magnetic island coalescence with and without guide field; Electron anisotropy and agyrotropy in asymmetric magnetic reconnection; Fully kinetic simulation of asymmetric magnetic reconnection at the dayside magnetopause
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Funding
- NASA MMS grant [NNX08AO84G]
- European Commission DEEP-ER project
- Onderzoekfonds KU Leuven (Research Fund KU Leuven)
- Interuniversity Attraction Poles Programme of the Belgian Science Policy Office [IAP P7/08 CHARM]
- FWO (Fonds Wetenschappelijk Onderzoek Vlaanderen) [12O5215N]
- NASA [NNX08AO84G, 95695] Funding Source: Federal RePORTER
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We present an analysis of the properties of the electron velocity distribution during island coalescence in asymmetric reconnection with and without guide field. In a previous study, three main domains were identified, in the case without guide field, as X, D, and M regions featuring different reconnection evolutions. These regions are also identified here in the case with guide field. We study the departure from isotropic and gyrotropic behavior by means of different robust detection algorithms proposed in the literature. While in the case without guide field these metrics show an overall agreement, when the guide field is present, a discrepancy in the agyrotropy within some relevant regions is observed, such as at the separatrices and inside magnetic islands. Moreover, in light of the new observations from the Multiscale MagnetoSpheric mission, an analysis of the electron velocity phase-space in these domains is presented.
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