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Ion-Beam-Driven Intense Electrostatic Solitary Waves in Reconnection Jet
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Space and Plasma Physics.ORCID iD: 0000-0003-1654-841x
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2019 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 46, no 22, p. 12702-12710Article in journal (Refereed) Published
Abstract [en]

Electrostatic solitary waves (ESWs) have been reported inside reconnection jets, but their source and role remain unclear hitherto. Here we present the first observational evidence of ESWs generation by cold ion beams inside the jet, by using high‐cadence measurements from the Magnetospheric Multiscale spacecraft in the Earth's magnetotail. Inside the jet, intense ESWs with amplitude up to 30 mV m−1 and potential up to ~7% of the electron temperature are observed in association with accelerated cold ion beams. Instability analysis shows that the ion beams are unstable, providing free energy for the ESWs. The waves are observed to thermalize the beams, thus providing a new channel for ion heating inside the jet. Our study suggests that electrostatic turbulence can play an important role in the jet dynamics.

Place, publisher, year, edition, pages
John Wiley & Sons, 2019. Vol. 46, no 22, p. 12702-12710
Keywords [en]
reconnection jet; dipolarization front; electrostatic solitary waves; ion beam instability; wave-particle interations; ion heating
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-266811DOI: 10.1029/2019GL085419ISI: 000498353500001Scopus ID: 2-s2.0-85075517573OAI: oai:DiVA.org:kth-266811DiVA, id: diva2:1388255
Note

Export Date: 23 January 2020; Article QC 20200129

Available from: 2020-01-23 Created: 2020-01-23 Last updated: 2020-01-30Bibliographically approved

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Vaivads, Andris

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