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Magnetic Reconnection, Turbulence, and Particle Acceleration: Observations in the Earth's Magnetotail
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2018 (engelsk)Inngår i: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 45, nr 8, s. 3338-3347Artikkel i tidsskrift (Fagfellevurdert) Published
Fritextbeskrivning
Abstract [en]

We report observations of turbulent dissipation and particle acceleration from large-amplitude electric fields (E) associated with strong magnetic field (B) fluctuations in the Earth's plasma sheet. The turbulence occurs in a region of depleted density with anti-earthward flows followed by earthward flows suggesting ongoing magnetic reconnection. In the turbulent region, ions and electrons have a significant increase in energy, occasionally >100 keV, and strong variation. There are numerous occurrences of |E| >100 mV/m including occurrences of large potentials (>1 kV) parallel to B and occurrences with extraordinarily large J · E (J is current density). In this event, we find that the perpendicular contribution of J · E with frequencies near or below the ion cyclotron frequency (fci) provide the majority net positive J · E. Large-amplitude parallel E events with frequencies above fci to several times the lower hybrid frequency provide significant dissipation and can result in energetic electron acceleration.

sted, utgiver, år, opplag, sider
Blackwell Publishing Ltd , 2018. Vol. 45, nr 8, s. 3338-3347
Emneord [en]
magnetic reconnection, parallel electric fields, particle acceleration, turbulent dissipation
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Identifikatorer
URN: urn:nbn:se:kth:diva-238242DOI: 10.1002/2018GL076993ISI: 000435745500004Scopus ID: 2-s2.0-85045845518OAI: oai:DiVA.org:kth-238242DiVA, id: diva2:1260088
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QC 20181101

Tilgjengelig fra: 2018-11-01 Laget: 2018-11-01 Sist oppdatert: 2019-06-13bibliografisk kontrollert

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Lindqvist, Per-Arne

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