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Intense Current Structures Observed at Electron Kinetic Scales in the Near-Earth Magnetotail During Dipolarization and Substorm Current Wedge Formation
RAS, Space Res Inst, Moscow, Russia.;Moscow Inst Phys & Technol, Dept Space Phys, Moscow, Russia..
Finnish Meteorol Inst, Helsinki, Finland..
RAS, Space Res Inst, Moscow, Russia..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0001-5550-3113
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2018 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, no 2, p. 602-611Article in journal (Refereed) Published
Abstract [en]

We use data from the 2013-2014 Cluster Inner Magnetosphere Campaign, with its uniquely small spacecraft separations (less than or equal to electron inertia length, lambda(e)), to study multiscale magnetic structures in 14 substorm-related prolonged dipolarizations in the near-Earth magnetotail. Three time scales of dipolarization are identified: (i) a prolonged growth of the B-Z component with duration <= 20 min; (ii) B-Z pulses with durations <= 1 min during the B-Z growth; and (iii) strong magnetic field gradients with durations <= 2 s during the dipolarization growth. The values of these gradients observed at electron scales are several dozen times larger than the corresponding values of magnetic gradients simultaneously detected at ion scales. These nonlinear features in magnetic field gradients denote the formation of intense and localized (approximately a few lambda(e)) current structures during the dipolarization and substorm current wedge formation. These observations highlight the importance of electron scale processes in the formation of a 3-D substorm current system.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2018. Vol. 45, no 2, p. 602-611
National Category
Geophysics Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-347651DOI: 10.1002/2017GL076303ISI: 000425514300014OAI: oai:DiVA.org:uu-347651DiVA, id: diva2:1195690
Funder
EU, Horizon 2020, 637302 PROGRESSAvailable from: 2018-04-06 Created: 2018-04-06 Last updated: 2018-04-06Bibliographically approved

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Khotyaintsev, Yuri V.

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