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Super-efficient Electron Acceleration by an Isolated Magnetic Reconnection
Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.
Beihang Univ, Sch Space & Environm, Beijing, Peoples R China.
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.ORCID-id: 0000-0003-1654-841x
Uppsala universitet, Institutet för rymdfysik, Uppsalaavdelningen.ORCID-id: 0000-0001-5550-3113
2019 (engelsk)Inngår i: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 870, nr 2, artikkel-id L22Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Magnetic reconnection-the process typically lasting for a few seconds in space-is able to accelerate electrons. However, the efficiency of the acceleration during such a short period is still a puzzle. Previous analyses, based on spacecraft measurements in the Earth's magnetotail, indicate that magnetic reconnection can enhance electron fluxes up to 100 times. This efficiency is very low, creating an impression that magnetic reconnection is not good at particle acceleration. By analyzing Cluster data, we report here a remarkable magnetic reconnection event during which electron fluxes are enhanced by 10,000 times. Such acceleration, 100 times more efficient than those in previous studies, is caused by the betatron mechanism. Both reconnection fronts and magnetic islands contribute to the acceleration, with the former being more prominent.

sted, utgiver, år, opplag, sider
Institute of Physics Publishing (IOPP), 2019. Vol. 870, nr 2, artikkel-id L22
Emneord [en]
acceleration of particles, magnetic reconnection
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-253253DOI: 10.3847/2041-8213/aafa75ISI: 000455938700002Scopus ID: 2-s2.0-85060198327OAI: oai:DiVA.org:kth-253253DiVA, id: diva2:1324655
Merknad

QC 20190625

Tilgjengelig fra: 2019-06-14 Laget: 2019-06-14 Sist oppdatert: 2019-06-25bibliografisk kontrollert

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