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Electron Diffusion Regions in Magnetotail Reconnection Under Varying Guide Fields
- Chen, L. -J (author)
-
- Wang, S. (author)
- NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA;Univ Maryland, Dept Astron, College Pk, MD 20742 USA
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- Hesse, M. (author)
- Univ Bergen, Dept Phys & Technol, Bergen, Norway
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- (creator_code:org_t)
- Blackwell Publishing, 2019
- 2019
- English.
- In: Geophysical Research Letters. - : Blackwell Publishing. - 0094-8276 .- 1944-8007. ; 46:12, s. 6230-6238
- Journal article (peer-reviewed)
Abstract
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- Kinetic structures of electron diffusion regions (EDRs) under finite guide fields in magnetotail reconnection are reported. The EDRs with guide fields 0.14–0.5 (in unit of the reconnecting component) are detected by the Magnetospheric Multiscale spacecraft. The key new features include the following: (1) cold inflowing electrons accelerated along the guide field and demagnetized at the magnetic field minimum while remaining a coherent population with a low perpendicular temperature, (2) wave fluctuations generating strong perpendicular electron flows followed by alternating parallel flows inside the reconnecting current sheet under an intermediate guide field, and (3) gyrophase bunched electrons with high parallel speeds leaving the X-line region. The normalized reconnection rates for the three EDRs range from 0.05 to 0.3. The measurements reveal that finite guide fields introduce new mechanisms to break the electron frozen-in condition.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Multidisciplinär geovetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geosciences, Multidisciplinary (hsv//eng)
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
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- Bessho, N.
- Russell, C.
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- Paterson, W.
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