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Direct Evidence for Electron Acceleration Within Ion-Scale Flux Rope

Zhong, Z. H. (author)
Nanchang Univ, Sch Resource Environm & Chem Engn, Nanchang, Jiangxi, Peoples R China;Nanchang Univ, Inst Space Sci & Technol, Nanchang, Jiangxi, Peoples R China
Zhou, M. (author)
Nanchang Univ, Sch Resource Environm & Chem Engn, Nanchang, Jiangxi, Peoples R China;Nanchang Univ, Inst Space Sci & Technol, Nanchang, Jiangxi, Peoples R China;Nanchang Univ, Sch Sci, Dept Phys, Nanchang, Jiangxi, Peoples R China
Tang, R. X. (author)
Nanchang Univ, Inst Space Sci & Technol, Nanchang, Jiangxi, Peoples R China
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Deng, X. H. (author)
Nanchang Univ, Sch Resource Environm & Chem Engn, Nanchang, Jiangxi, Peoples R China;Nanchang Univ, Inst Space Sci & Technol, Nanchang, Jiangxi, Peoples R China
Turner, D. L. (author)
Aerosp Corp, El Segundo, CA 90245 USA
Cohen, I. J. (author)
Johns Hopkins Univ, Appl Phys Lab, Laurel, MD USA
Pang, Y. (author)
Nanchang Univ, Inst Space Sci & Technol, Nanchang, Jiangxi, Peoples R China
Man, H. Y. (author)
Nanchang Univ, Inst Space Sci & Technol, Nanchang, Jiangxi, Peoples R China;Nanchang Univ, Sch Sci, Dept Phys, Nanchang, Jiangxi, Peoples R China
Russell, C. T. (author)
UCLA, Dept Earth Planetary & Space Sci, Los Angeles, CA USA
Giles, B. (author)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
Paterson, W. R. (author)
NASA, Goddard Space Flight Ctr, Greenbelt, MD USA
Khotyaintsev, Yuri V. (author)
Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
Burch, J. L. (author)
Southwest Res Inst, San Antonio, TX USA
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 (creator_code:org_t)
AMER GEOPHYSICAL UNION, 2020
2020
English.
In: Geophysical Research Letters. - : AMER GEOPHYSICAL UNION. - 0094-8276 .- 1944-8007. ; 47:1
Related links:
https://urn.kb.se/re...
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https://doi.org/10.1...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • Energetic electrons have frequently been observed in small-scale flux ropes. However, whether these energetic electrons were energized directly within the flux rope or not is unknown. In this paper, we present concrete evidence provided by the Magnetospheric Multiscale mission that a secondary flux rope provided strong acceleration for electrons expelled by the reconnection X line. We find that the energetic electron fluxes inside the ion-scale flux rope were larger than those outside the flux rope. Electrons were adiabatically accelerated by betatron and Fermi mechanisms inside the flux rope. The highest energy electrons (>100 keV) were produced by betatron acceleration, whereas Fermi acceleration was unable to accelerate the electrons to high energy probably due to the finite distance of the acceleration region along the field-aligned direction. These results confirm the essential role of ion-scale flux ropes in producing energetic electrons.

Subject headings

NATURVETENSKAP  -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)

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