Electron Diffusion Regions in Magnetotail Reconnection Under Varying Guide Fields

Geophysical Research Letters - Tập 46 Số 12 - Trang 6230-6238 - 2019
Li‐Jen Chen1, Shan Wang1,2, M. Hesse3, R. E. Ergun4, T. E. Moore1, B. L. Giles1, Naoki Bessho1,2, C. T. Russell5, J. L. Burch6, R. B. Torbert7,6, K. J. Genestreti7, W. R. Paterson1, C. J. Pollock8, B. Lavraud9, O. Le Contel10, R. J. Strangeway11, Y. V. Khotyaintsev12, Peter Lindqvist13
1GSFC - NASA Goddard Space Flight Center (Greenbelt, MD 20771 - United States)
2University of Maryland [College Park] (College Park, MD 20742 - United States)
3UiB - University of Bergen (Universitetet i Bergen | Postboks 7800, NO-5020 Bergen - Norway)
4LASP - Laboratory for Atmospheric and Space Physics [Boulder] (1234 Innovation Drive, Boulder, CO 80303-7814 - United States)
5Department of Earth, Planetary, and Space Sciences, University of California, Los Angeles, CA, USA
6SwRI - Southwest Research Institute [San Antonio] (6220 Culebra Rd, San Antonio, TX 78238 - United States)
7EOS Space Science Center [Durham] (8 College Road, Durham, NH 03824-3525 - United States)
8Denali Scientific Healy AK USA
9Institut de Recherche en Astrophysique et Planétologie, Université de Toulouse (UPS), CNRS, CNES Toulouse France
10Laboratoire de Physique des Plasmas (UMR7648), CNRS/Ecole Polytechnique/Sorbonne Université/Univ. Paris‐Sud/Observatoire de Paris Paris France
11IGPP - Institute of Geophysics and Planetary Physics [Los Angeles] (603 Charles E. Young Drive, East, Los Angeles, CA 90065-1567 - United States)
12IRF - Swedish Institute of Space Physics [Uppsala / Kiruna] (Box 537 SE-751 21 Uppsala / Rymdcampus, 981 28 Kiruna - Sweden)
13KTH - KTH Royal Institute of Technology [Stockholm] (SE-100 44, Stockholm, Sweden - Sweden)

Tóm tắt

AbstractKinetic 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.

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Tài liệu tham khảo

10.1126/science.1160495

10.1002/2016JA022827

10.1063/1.4989737

10.1002/2014GL062034

10.1029/2018GL081216

10.1007/s11214-015-0164-9

10.1126/science.aaf2939

10.1029/2004JA010519

10.1063/1.3112744

10.1029/2008JA013385

10.1063/1.3529365

10.1002/2016GL068243

10.1002/2016GL069215

10.1002/2017JA024004

10.1063/1.1594724

10.1103/PhysRevLett.94.095001

10.1029/2009JA014650

10.1007/s11214-014-0115-x

10.5194/angeo-36-373-2018

10.1063/1.2220534

10.1029/2018JA025711

Harvey C. C., 1998, Spatial gradients and the volumetric tensor, ISSI Sci. Rep. SR‐001, 307

10.1063/1.2403784

10.1103/PhysRevLett.118.145101

10.1063/1.1795991

10.1029/2001GL014714

10.1063/1.5021461

10.1007/s11214-010-9740-1

10.1063/1.1758718

10.1029/98GL51784

10.1002/2016GL068359

10.1007/s11214-014-0096-9

10.1007/s11214-014-0116-9

10.1029/2018JA025713

10.1063/1.4766895

10.1103/PhysRevLett.106.065002

10.1103/PhysRevLett.109.055001

10.1002/2015JA022040

10.1007/s11214-016-0245-4

10.1029/2003JA009999

10.1007/s11214-014-0057-3

10.1002/2015GL063601

10.1029/JZ072i001p00171

10.1029/JZ070i017p04219

10.1126/science.aat2998

10.1007/s11214-014-0109-8

10.1002/2015JA021892

10.1029/2004JA010708

10.1038/ncomms5774

10.1063/1.4948721

10.1063/1.4874331

10.1103/PhysRevLett.110.215007

10.3847/1538-4357/aaf16f

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Geophysical Research Letters

Tập 46 Số 12

6230-6238

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