Suprathermal electron acceleration during reconnection onset in the magnetotail
2011 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 29, no 10, 1917-1925 p.Article in journal (Refereed) Published
We study one event of reconnection onset associated to a small substorm on 27 September 2006 by using Cluster observations at inter-spacecraft separation of about 10 000 km. We focus on the acceleration of suprathermal electrons during different stages of reconnection. We show that several distinct stages of acceleration occur: (1) moderate acceleration during reconnection of pre-existing plasma sheet flux tubes, (2) stronger acceleration during reconnection of lobe flux tubes, (3) production of the most energetic electrons within dipolarization fronts (magnetic pile-up regions). The strongest acceleration is reached at the location of B(z) maxima inside the magnetic pile-up region where the reconnection jet stops. Very strong localized dawn-dusk electric field are observed within the magnetic pile-up regions and are associated to most of the magnetic flux transport.
Place, publisher, year, edition, pages
2011. Vol. 29, no 10, 1917-1925 p.
Magnetospheric physics, Magnetotail, Space plasma physics, Magnetic reconnection
Geophysics Physical Sciences
IdentifiersURN: urn:nbn:se:uu:diva-163251DOI: 10.5194/angeo-29-1917-2011ISI: 000296603000017OAI: oai:DiVA.org:uu-163251DiVA: diva2:464463